Be an active part of the Summit: Last Call for Presentations

There are still a few slots open for you to present on the virtual Gerrit User Summit.

Submit your presentation proposal by creating a change to the Gerrit Summit 2021 repository by following these steps:

  • Login to https://gerrit-review.googlesource.com
  • Go to the Gerrit Summit 2021 repository
  • Click “CREATE CHANGE” button and specify the branch (master) and the headline of your talk
  • Click on “EDIT” button on the top-right to edit your change
  • Click on the “ADD/OPEN/UPLOAD” button and enter the filename for your talk (e.g. sessions/super-duper-repos.md for a talk or lightning-talks/mini-session.md for a lightning talk) upload the text for your talk by dragging the markdown text into the window.
  • Click the “PUBLISH EDIT” button on the top-right of the change screen
  • Click on the “MARK AS ACTIVE” button on the top-right of the change screen

Your talk will then be reviewed by the community and, when accepted, merged into the Gerrit User Summit 2021 site.

Don’t miss out!

Gerrit User Summit 2021: how to tackle big mono-repos

GerritForge keeps working to improve performance using Gerrit with very large mono-repos with millions of refs, hundreds of GBs and tens of millions of objects.

On the second day of the virtual Gerrit User Summit 2021, Luca will present the work done over the past two years to overcome significant difficulties when:

  • Reducing the overhead of refs advertisement
  • Speeding-up clones by a 10x factor
  • Reducing the system load when accessing change notes
  • Increasing performance of replication
  • Surviving the deadly “search-for-reuse” phase during git-upload-pack

Register here to join the user summit on December 2nd and 3rd.

SAVE THE DATE: Gerrit User Summit is back on 2 & 3 Dec 2021

REGISTRATION is open to the Virtual Gerrit User Summit. It will take place on 2nd and 3rd December 2021 https://gerrit.googlesource.com/summit/2021/+/refs/heads/master/index.md

The Gerrit Community is happy to announce the Gerrit Virtual User Summit 2021, THE event of the year for everything related to Gerrit Code Review and the trunk-based development pipeline.

A Virtual Summit

The Gerrit User Summit 2021 will be held online only, to allow most of the community around the globe to attend and share their experience and ideas, and avoid the problems with the travelling restrictions due to the COVID-19 pandemic.

The 2-day User Summit is open to all the members of the community as well as those that are willing to learn and adopt Gerrit Code Review in their development process.

Gerrit v3.4.0-rc5: weekly update

Merged Changes

From Luca Milanesio:

    Allow GerritAccount Cookie authentication for Git/HTTP
    Bug: Issue 14508
    Change-Id: I2a56197ee0dad479f0973192157e5970d9deac25

    Avoid multiple auth requests for Git/HTTP access
    Bug: Issue 14497
    Change-Id: Ibe41df0357b6be10bcdf0bd1f5a1b6160c34d4a4

    Introduce LDAP metrics
    Bug: Issue 14490
    Change-Id: I18e5d5b797b272ca11a6745bc39dcd73cab68c34

    Add unit-tests for ProjectBasicAuthFilter
    Change-Id: Ib9abf133d2128b6a29751ecbeda26b0b43115bb3

From Han-Wen Nienhuys:

    Documentation/user-review-ui: remove intraline diff mention
    Change-Id: I15faa971d5cfe80ab82295f1af4e307da1d17f10

    Documentation/user-review-ui: show just a single shortcut help screenshot
    Change-Id: I2ad396a20767221f293d2ec59e6ac61a85e12629

    Documentation/user-review-ui: remove mention of old UI
    Change-Id: I88adb24c5883410bc62b9e290e4077e6b845474a

    Documentation: rename all images for user-review.txt to gwt-*.png
    Change-Id: I42735800679736ef277a053e042908677c4db5ef

    Documentation: remove unused GWT image files
    Change-Id: Ie470c983509310b4a6eb35eedbc03ffa5e8028cd

From Matthias Sohn:

    Update jgit to a9579ba60cd2fd72179dfd8c2c37d389db5ec402
    [1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=552173
    [2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=573328
    Change-Id: Id3a4adc0faf27e7bcd2017ab439aa2230cf92b33

    Add new command convert-ref-storage to index
    Change-Id: If3a93e65333d1a5f299273711162d81e1b653e1b

From Antoine Musso:

    download_file: download to GERRIT_CACHE_HOME when set
    Change-Id: Ie4fac83928527e0e71b159b9500983234c2261ac

From Prudhvi Akhil Alahari:

    Fix EqualsLabelPredicate to not fail when calling match() from a plugin
    Change-Id: Icd2541fe26c18a8e61ce855862e0c9814a91f5ef

From Thomas Dräbing:

    Respect auth.userNameToLowerCase when creating accounts via REST or SSH
    Bug: Issue 14246
    Change-Id: If0f120f188e9f5bdf8008c4e66a55568180e7351

Issues Fixed

  • Issue 14246: Creation of internal account does not respect auth.userNameToLowerCase
  • Issue 14490: Missing LDAP metrics for authentication
  • Issue 14497: Git/HTTP traffic overloads LDAP with duplicate authentication requests
  • Issue 14508: Issue 14508: Gerrit authenticates more than once for a Git/HTTP high-level operation

Issues Raised

  • Issue 14388: Mobile diff context buttons do not work properly

Gatling E2E results

Git protocol simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/360/gatling/report/gerritgitsimulation-20210511183716601/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritGitSimulation.scala

Gerrit UI REST simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/360/gatling/report/gerritrestsimulation-20210511184140917/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritRestSimulation.scala

Gatling 10-days trend

Gerrit v3.4.0-rc4: weekly update

Merged Changes

From David Ostrovsky:

    Tidy up dev-plugins.txt documentation
    Change-Id: Ia3b09d5febcfe9ab1805bd2e55963aa6c6624f6a

    Reftable: Add convert-ref-storage ssh command
    Bug: Issue 14138
    Change-Id: I0ddd2370619de287ec757597ba57e8b757611808

    Bazel: Tidy up gerrit_js_bundle rule
    Change-Id: I9b3e757717a64e8538d5d05bdb86b3b26c9f363d

    Make srcs in gerrit_js_bundle optional
    Change-Id: Ifaca618836098798dfbad10c2f5c2aee10f6097f

    Fix link for change.enableAssignee configuration option
    Change-Id: I2faef25ea62119184e1a837b647b9cccdc246354

    ErrorJsonLogEntry: Use IP address as host value in logging event
    Change-Id: Ie3a246ff277a0b8646dbe11acdb2b53aa659800e

    Bazel: Add gerrit_js_bundle rule
    Change-Id: Ia8421a9ef6f1ad91808bb698769da84022f63973

From Edwin Kempin:

    Allow tests to check how much Counter0 metrics are increased by a call
    Change-Id: I79da799c86325eb64922a92caec8a476e4e6a4ae

From Ben Rohlfs:

    Improved and more sophisticated handling of check action results
    Change-Id: I4f139bbe913c60fbdcea27dd9ea1e3f605bb19cb

    Add documentation for the new Checks JavaScript Plugin API
    Change-Id: I82cd3c9af9c918b1c26ea1cb8a70e3283138ac31

    Add links to frontend plugin examples
    Bug: Issue 14421
    Change-Id: I123f1717ac691eda20709c20764db457c58b42e2

    Remove draft warning from Checks API
    Change-Id: I267b2792efee3baa27ebbe6915b0c7813efab566

    Update all the plugin examples
    Change-Id: Idc6473377bb5966f0bc199bfc68977297df4f802

    Tiny documentation fix
    Change-Id: I505419cdf03bfe5dd3a1dd28eeb84def36a3669a

    Update the JavaScript Plugin API documentation
    Bug: Issue 14421
    Change-Id: I5869c8168fe27bea81226b0b8f1dc40b271c2454

From Youssef Elghareeb:

    Rename SubmitRequirement to LegacySubmitRequirement
    Change-Id: Ib55038627c95ece82a7eddd64e317183f1752487

From Patrick Hiesel:

    SubmitRecord.Status: Reserve RULE_ERROR for user-caused errors
    Change-Id: I018ce9e13fa40f2f24546df49ecf7fc3fbb72b1b

Issues Fixed

  • Issue 14138: expose JGit reftable conversion as Gerrit SSH command
  • Issue 14421: Update the Frontend Plugin Documentation

Issues Raised

None

Gatling E2E results

Git protocol simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/348/gatling/report/gerritgitsimulation-20210504002334245/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritGitSimulation.scala

Gerrit UI REST simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/315/gatling/report/gerritrestsimulation-20210426212355447/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritRestSimulation.scala

Gatling 10-days trend

Gerrit v3.4.0-rc3: weekly update

Merged Changes

From David Ostrovsky:

    Bazel: Remove assets parameter in polygerrit_plugin rule
    Change-Id: I86b996a4e98c7ea8ea35bfda097ff60092078028

    EventGsonProvider: Register generic event serializer adapter
    Change-Id: I7dc6e6a859152ee3e30a90075ddd34814720eba1

    EventJsonTest: Add test for custom event serialization
    Change-Id: I7e45f77aa980c03896e3891c2d48680e31d2e0a6

    Disable peer IP in reflog record per default
    Bug: Issue 10810
    Change-Id: Ia7a04cdce0425989059b92131afd8c2f6030d10b

    Allow to suppress peer IP in reflog records
    Bug: Issue 10810
    Change-Id: I5645a4e68fb48ad155609573aea2518480074697

    Remove enableReverseDnsLookup configuration option
    Change-Id: If33c6e1901b70ca64d9b32b0ebb310f3a9daf017

    Revert "Respect enableReverseDnsLookup option in ErrorLogJsonLayout"
    Change-Id: I8f74ca039246753f775b7bfc96596e3f5159af01

    Clean up polygerrit_plugin rule
    Change-Id: Ie46a8f02a2b485a856916fe14002dc6d0e710c20

From Paladox:

    Remove KnownExperimentId from gr-comment-thread
    Change-Id: Ib13d07e6dc71e3133fdc249c72809082c0fa915b

    Cleanup undefined check for access in getRepoAccess
    Change-Id: Ieefab7e709a4124409ced7cb86ecdde37748d906

From Frank Borden:

    Upgrade package.json dependencies
    Change-Id: Ifb400606b6c420f732bb36e87bf43018253757ee

From Ben Rohlfs:

    Add a SHOW ALL button to check result sections    
    Change-Id: I6be8585c285db6255e25060f61008cb57232f154

    Add support for top-level links in the Checks Tab
    Change-Id: Icca6e93b44b28d33607032e2a4d74327a684c2a8

    Remove experiments for comment context and checks
    Change-Id: I130b7846414e281062906def588151da71d72d96

    Implement a detailed check run hovercard
    Screenshot https://imgur.com/a/9grF5sm
    Change-Id: I185264d0ce02726487facda19c116b9351fc9a7f

    Fix target area for expanding/collapsing check result rows
    Change-Id: Ibdd08e8732e047c62a453b02324408466817305a

    Fix counting of selected and filtered check results
    Change-Id: Iea4c1816dd23272678bcd5aa0f3ff549257606ed

    Do not always show the checks error message
    Change-Id: I61656729770322bb1795c44fd297fda4d1a0256d

    Refined UI for checks error responses
    https://imgur.com/a/baILcJl
    Change-Id: I63f1cc5f128681f46cae3ab875744946b8537ea4

    Add handling of not-logged-in and error states
    Change-Id: I701a2fbdebca8d5b4adc437554b49597c8cc166a

    Fix checks utility for link icons
    https://imgur.com/a/ZMFEuGr
    Change-Id: Ie242e578ff91def52c559a10124d82b836077b90

    Change check tag/label font color from deemphasized to primary
    Change-Id: Ie2de29d019d7ccab8075d212600a3da0267fc8e1

    Add actions and links to check result rows    
    Change-Id: I2ff5a594bcc927910855d89c52484a5aef4581e0

    Fix the color of the attention and status icons
    Change-Id: I2a32e1f22848e122c0fd3016d8b91fbc16d029a6

    Only render expanded checks row once the user has clicked the row
    Change-Id: I4039953a63a84995577f309dcb2fbfee5680be86

From Milutin Kristofic:

    Remove new-change-summary feature flag from gr-change-view
    Change-Id: I971bc62bacc61b1985adb5de8d4fd36da68f2f46

    Remove old implementation of gr-related-changes-list
    Change-Id: Ic42f9af760042cd0e080a29b09c3d21d20bd161c

    Move tests from old to new gr-related-changes-list
    Change-Id: I631cde95d00a1e54b1820232733424b28f74bff4

    Remove new-change-summary feature flag from gr-change-summary
    Change-Id: Id27fb05cd42186cea5de068da791a73c7f0064cb

    Remove new-change-summary feature flag from gr-change-metadata    
    Change-Id: Ie2116e83e258b46c546056b6a9b6867e1dadcd35

    Remove new-change-summary feature flag from gr-thread-list   
    Change-Id: I8eaf790199c80956cf3c32e70d7e6fde133cabbd

    Remove new-change-summary feature flag from gr-thread-list    
    Change-Id: I8eaf790199c80956cf3c32e70d7e6fde133cabbd

    Remove new-change-summary feature flag from gr-editable-content    
    Change-Id: Ic324b6f210fc37ee5e52253dc0658c89e395c0ef

    Remove new-change-summary feature flag from gr-reviewer-list
    Change-Id: I6675f9e57244fd70b940d6a659e0dcd8d1533388

    Remove 'shared-styles' from most frequent gr-elements
    Change-Id: I7ab764397fb0bda92e7c784e5c0aac2d17c2e63d

    Remove new-change-summary feature flag from gr-change-requirements
    Change-Id: I77e6f174a73979b8c6e52f67953909e97964ae9e

    New change summary UI - fix small A11y issues
    Change-Id: I29310115583b7c5ac349923d6014dd49f66aaa1a

    Always show add topic row in metadata
    Change-Id: I794c028c8f9c81b43918511fac193b702c20f147

    Pressing enter on focused button supress keyboard shortcuts
    Change-Id: I6d28ebd022041a617be645fcd7f89ecb68d9cc54

From Dhruv Srivastava:

    Only show Merged As info if change has been merged
    Change-Id: I2405bf98dbb6542cb36cc0767dc79d61061bf3c8

    Remove patchset level comments from patchset dropdown count
    Change-Id: Ib4fc43e0c3797834b72a765ae2afce6f70871e9d

    Show user first in list of reviewers in change view
    Screenshot: https://imgur.com/a/FW60KC2
    Issue: Bug 14366
    Change-Id: I5ae9fc2e1b90f2dbbb7040d81be0e69f44ce9e3a

    Clean up Add Patchset Description from File List header
    Change-Id: Ia1ce16f776f81f734c0b03acce60a02e46190465

    Move Merged as info from change header to change summary
    Screenshot: https://imgur.com/a/MgZNe7G
    Change-Id: Ie2a5715dc65a20447f296f5246962b6445836490

    Show Code Review quick approve button with missing labels
    Change-Id: I3f9179177d92a7b7932353da1a36c5decad599ec
    (cherry picked from commit 25ca8ea4e9b9abb65ec6cc05af767a7e03b479da)

From Dmitrii Filippov:
    Fixes for Typescript 4.2
    Change-Id: I2387d5664c6748a1194ca52a0560d1d961ca64e4

    Fix and update license generator
    Bug: Issue 14175
    Change-Id: Ifd38a8e3ae7f06354e00aee420f282773b64583a

From Edwin Kempin:

    Export PluginPushOption for use in plugins
    Bug: Issue 14362
    Change-Id: Ie64c22bc4fed65950844dd4cd9a3e5328fe4eb8f

From Matthias Sohn:

    Welcome administrator of freshly installed Gerrit site
    Bug: Issue 12209
    Change-Id: Ib26372a610ab2e9c8266a71c9b2c41cfda9a051a

From Luca Milanesio:

    Avoid NPE when logging incoming HTTP request
    Bug: Issue 14410
    Change-Id: I4bdbe7418ccc4b223fa57b7fb49c2aa46f5d3982

    Add initial stream-events acceptance tests
    Bug: Issue 13799
    Change-Id: I6987d413ba911039e56950425b501573b4555204

Issues Fixed

  • Issue 10810 : Gerrit leaks user IP address to project owners
  • Issue 12209: Remind users that install Gerrit newly to join the Gerrit community and register on repo-discuss
  • Issue 13799: No tests for stream-events
  • Issue 14175: //Documentation:check_licenses target fails with python 3 on stable-3.3 branch
  • Issue 14362: uploadvalidator check should be bypassable
  • Issue 14410: NPE when tracking Gerrit HTTP logs
  • Issue 14366: Always show self first in list of reviewers on change page

Issues Raised

  • Issue 14336: PolyGerrit: no way to configure checkers using UI provided by checks plugin

Gatling E2E tests results

Git Protocol Simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/315/gatling/report/gerritgitsimulation-20210426212117440/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritGitSimulation.scala

Gerrit UI REST Simulation:

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/315/gatling/report/gerritrestsimulation-20210426212355447/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritRestSimulation.scala

Gatling 10-days trend

Gerrit v3.4.0-rc1: weekly update

Starting from this week, GerritForge provides a weekly status update of how the Gerrit v3.4.0 release plan is progressing:

  1. List of merged changes since the previous RC
  2. List of issues fixed
  3. Result of the Gatling E2E tests on AWS

We hope that having these regular updates would help you focus on what is changing during the release plan execution and do more research, learning or specific investigation on the areas that are more pertinent to your use case.

Also, because the Gerrit release candidates do not come with an associated set of release notes, the list below would help people understand the new functionalities or fixes coming through every week.

Both Gatling-Git and the AWS-Gerrit project with a complete production-ready setup are projects started by GerritForge and contributed as OpenSource to the Gerrit community.

Merged changes

From Matthias Sohn:

    Log memory allocated per command in httpd_log 
    Change-Id: Ie0ce1382a8515e6dfb7d0d3fe10b3e64c0cf9aee

    Log cpu usage per http request   
    Change-Id: I9e78bed5219f9baf57a2b76f0f947efff334ffe5

    Log memory allocated per command in sshd_log
    Change-Id: Ifc1d274bf42eb3cb9b2cf46271b6be0117aa8b18

    Add metrics for monitoring Java memory pools
    Change-Id: I60e5960899c0cff8c05983d299b414d7a646bb07

    Log cpu usage in sshd_log
    Change-Id: I1c53f64caf982c2f85195e6bda4c6d790f79a810

    Encapsulate fields of SshScope.Context
    Change-Id: If989630425ad40922aaf8958c4335aab0bb5c2c9

    Log "-" for missing log fields in sshd_log
    Change-Id: I90adc7618864f702b42029ab596c6014bd4c6cfe

From Ben Rohlfs:

    Remove backend support for HTML UI plugins
    Change-Id: I44cc0d15910937de7e1f9b9780a799d4b85b0673

    Stop producing html version of plugins
    Change-Id: I1036f06e385f2997f7bea849755729df2789acaa

From Milutin Kristofic:

    A11y - show outline when focused on tab title in change view
    Change-Id: Ie9456a5d886e70a77dae8f055a54a3a1a0045daf

    A11y - show outline when focused on change subject in dashboard
    Change-Id: I9c73e49de661a17928c6f96a290c2069503bdfb4

    A11y - fix and improve label when navigating dashboard
    Change-Id: Id01302aea38c783687443401290995bdd0764126

From Hermann Loose:

    Allow setting image viewer max-width and max-weight externally
    Change-Id: Ie151a85d8ede5cb7fa0899d9367ca0dccd887538

From Han-Wen Nienhuys:

    Fix meta_diff documentation
    Change-Id: I9c59a4857724cdfd59b995a6dc255f77d29b017e

From Paladox:

    Update plugins/codemirror-editor and plugins/delete-project
    Change-Id: Ieca7d2e36b9eefffe5c830962109e1fa62134b5c

    gr-confirm-move-dialog: Fix _getProjectBranchesSuggestions
    Change-Id: I8d4ead0bf3a8c30d0ecefdc190e4ba4ea7ede29d

    Remove unused _handleDropdownTap
    Change-Id: Ie4a8effd6d814985cafa6dea9239903f503dae33

    Remove unused _handleDropdownTap
    Change-Id: Ie4a8effd6d814985cafa6dea9239903f503dae33

From Dhruv Srivastava:

    Clean up upload change help dialog
    Change-Id: I0c72450c37326ec2c2922b74928e0b059df0043e

From Saša Živkov:

    Fix binding of DELETE REST calls from plugins
    Change-Id: I9b9632e8f719937e5f7c61466996be79e6f29c14

Issues fixed

  • Issue 14335: CodeMirror plugin broken
  • Issue 14127: REST API DELETE query for delete-project plugin doesn’t work

Gatling E2E tests results

Git Protocol Simulation

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/287/gatling/report/gerritgitsimulation-20210412213548212/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritGitSimulation.scala

Gerrit UI REST Simulation

Gatling full results:
https://gerrit-ci.gerritforge.com/job/gatling-gerrit-test/287/gatling/report/gerritrestsimulation-20210412213912089/source/index.html

Gatling simulation class:
https://github.com/GerritForge/gatling-sbt-gerrit-test/blob/master/src/test/scala/gerritforge/GerritRestSimulation.scala

What’s new in Gerrit Code Review v3.2

gerrit-code-review-3.2-intro

Gerrit Code Review is unstoppable: despite the recent COVID-19 pandemic and the cancellation of the Spring Hackathon 2020, the community has made an extraordinary effort to deliver remotely and on-time the Gerrit v3.2 release on the 1st of June.

GerritForge has already migrated GerritHub.io on the day-1 of the release and is happy to share with you the highlights of this new release. If you need help to assess your current setup and migrating, please get in touch with us at https://gerritforge.com/contact.

Get ready to migrate: get rid of zombie comments

The migration process performs the cleanup of the zombie draft comments in the All-Users.git repository that has been left behind since the introduction of NoteDb back in v2.16.
Every user commenting on any change was creating a series of commits on the All-Users.git repository, where the draft comments are stored. Once the comments were finalised and applied to the change, they were not fully removed from the All-Users.git. That created a backlog of zombie comments on All-Users.git that are now being completely removed during the Gerrit v3.2 migration process.

Since Gerrit v2.16.16, there is a standalone utility to remove the zombie draft comments. You may want to do that operation upfront to make sure that the migration to v3.2 does not have a lot of processing during the init step. Also, make sure that the All-Users.git resides on a fast access local filesystem for minimizing the migration time.

If you do nothing, the cleanup utility will be automatically executed when migrating to Gerrit v3.2, bearing in mind that it may take quite a long time to complete. In our tests, it took around 10 minutes for 10k zombie comments.

WARNING: the execution time is not linear and it may take up to 48h of processing time for a staggering number of 1M zombie comments.

Migrate with zero-downtime

If you have on Gerrit v3.1.x in a high-availability configuration, you can upgrade seamlessly to Gerrit v3.2, without having to suspend or degrading the service in any way. GerritForge has a record number of installations done in high-availability and multi-site: if you are running a single Gerrit master today, you should get in touch with the GerritForge Team to help moving to high-availability.

For the very first time, the whole Gerrit Community can benefit from the ability to perform a rolling upgrade without any downtime.

The zero-downtime upgrade consists of the following steps:

  1. Have Gerrit masters upgraded to v3.1.6 (or later) in a high-availability configuration, healthy and able to handle the incoming traffic properly.
  2. Set gerrit.experimentalRollingUpgrade to true in gerrit.config on both Gerrit masters.
  3. Set the first Gerrit master unhealthy.
  4. Shutdown the first Gerrit master and then upgrade to v3.2.
  5. Startup the first Gerrit master and wait for the on-line reindex to complete.
  6. Please verify that the first Gerrit master is working correctly and then make it healthy again.
  7. Wait for the first Gerrit master to start serving traffic regularly.
  8. Repeat steps 3. to 7. for the second Gerrit master.
  9. Remove gerrit.experimentalRollingUpgrade from gerrit.config on both Gerrit masters.

NOTE: Gerrit v3.1.6 has not been released yet. However, if you want to perform a rolling upgrade today, you can download the latest build on the stable-3.1 branch from the GerritForge’s CI at https://gerrit-ci.gerritforge.com/job/Gerrit-bazel-stable-3.1/

GerritHub.io has been successfully upgraded on the 1st of June without any interruption of any kind using the above procedure.

Java 11 official support

Gerrit is now officially supported on Java 11, in addition to Java 8. Running on Java 11 was already possible from v2.16.13, v3.0.4 and v3.1.0, but not officially supported because of the lack of a CI validation on Java 11 for stable-2.16, stable-3.0 and stable-3.1 branches.

Gerrit v3.2 has been validated with Java 11, with the following known issues:

  • Issue 11567: Java 11 runtime & startTLS LDAP broken: ‘error code 8 – BindSimple: Transport encryption’.
  • Issue 12639: WARNING: An illegal reflective access operation has occurred, when starting Gerrit.

After 24h of adoption of Gerrit v3.2 on GerritHub.io, we have seen two major benefits from the migration to Java 11: overall reduction of the “old generation” build up in the JVM heap and massive reduction of GC cycles times and full-GCs.

screenshot-2020-06-02-at-11.48.30

Before the 29th of May, all GerritHub.io nodes were on Gerrit v3.1 / Java8. The old-generation JVM heap keeps on building up constantly until it reaches the 60GB and triggers a full GC cycle. After the upgrade to Gerrit v3.2 / Java11, memory consumption is very much under control. There are still possibilities of peaks with associated full GCs (see the one on the 30th of May around 12:00 BST) but there isn’t build up of old-generation objects anymore.

screenshot-2020-06-02-at-11.52.43

Java11 brings a lot of benefits also in reducing the latency of the individual GC cycles, showing much better performance with large heaps.
After the migration on the 29th of May, the GC graph is pretty much flat. The only full GC peak that is noticeable on the 30th of May lasted for just 5 msecs while the normal GC cycles are well below 1 msec, barely noticeable.

Performance is a feature

Shawn Pearce, the Gerrit Code Review project founder, used to say “performance is a feature”, which is very true. Any software nowadays can provide some basic out of the box features, thanks to the plethora of open-source components available out of the box. However, designing architecture and making it scale and perform to the levels that an Enterprise Code Review system needs, it is not easy.

Gerrit v3.2 is yet another significant milestone in the continued effort of the Gerrit maintainers and contributors in making Gerrit Code Review faster, more stable and available than ever before.

Performance tuning isn’t a “one-off task” but is a continuous improvement on thousands of little details ranging from the front-end javascript tuning down to the backend of the platform.

New accounts cache

From the data collected on googlesource.com Patrick Hiesel (Google) has identified the accounts loading from NoteDb as a significant cause of the delay of backend calls. That is true for all Gerrit installations, but especially for distributed setups or setups that restart often.

Gerrit v3.2 introduces a brand-new AccountCache decomposed into smaller chunks that can be cached individually:

  1. External IDs + user name (cached in ExternalIdCache)
  2. CachedAccountDetails (newly cached)
  3. Gerrit’s default settings CachedAccountDetails – a new class representing all information stored under the user’s ref (refs/users/<sharded-id>).

The new structure is cleverly designed to require a lot less I/O when an entry needs to be reloaded and lowering the ratio of cache-miss in case of user’s details updates.

The new structure has the following advantages:

  1. CachedAccountDetails contains only details from refs/users/<sharded-id>. By that, we can use the SHA1 of that ref as cache key and start serializing the cache to eliminate cold start penalty as well as router assignment change penalty (for distributed setups). It also means that we don’t have to do invalidation ourselves anymore.
  2. When the server’s default preferences change, we don’t have to invalidate all accounts anymore.
  3. The projected speed improvements that come from persisting the cache makes it so that we can remove the logic to load accounts in parallel.

Migration to Polymer 3

PolyGerrit UX roadmap continues with yet another important milestone: the migration to Polymer 3. The result is visible with an improved polishing of the GUI and significant speedup of rendering and reduction of page loading times.
There are a significant amount of small refinements to the GUI as well, coming from a meticulous work of fixes included in this release.
Not by surprise, the number of issues fixed in v3.2 on the PolyGerrit UX outnumbers by far the overall changes in the release notes.

gerrit-3.2-findings

PolyGerrit is giving special attention to the classification of the feedback coming from robots rather than humans.
Most of the efforts made in the past 12 months target the improvement the support for robot-comments and giving some extra dedicated space for them.
In Gerrit v3.2 there is a special place for them in a brand-new “Findings” tab. It is currently empty on GerritHub.io as people did not start using them much. However, I do see a lot of space of adoption of this new feature, giving the ability for more integration of linters and automatic validation feedback in this tab.

A flooding of fixes and small improvements

The list of fixes and improvements in Gerrit v3.2 is really huge. Please check the release notes on the Gerrit Code Review release page for all the details.

There are a lot of reasons to migrate to Gerrit v3.2, the fastest, more stable and scalable release of Gerrit Code Review ever.


Thanks a lot to the whole Gerrit Code Review Community of maintainers and contributors for making this release happen. Thanks to Patrick Hiesel for the technical description of the account cache improvements and the replication clustering.

Luca Milanesio (GerritForge)
Gerrit Code Review Maintainer, Release Manager, ESC Member

 

How to enable Git v2 in Gerrit Code Review

git-2-26

(c) Shutterstock / spainter_vfx

Git protocol v2 landed in Gerrit 3.1 on the 11th of October 2019. This is the last email from David Ostrovsky concluding a thread of discussion about it:

It is done now. Git wire protocol v2 is a part of open source Gerrit and will be
shipped in upcoming Gerrit 3.1 release.

And, it is even enabled per default!

Huge thank to everyone who helped to make it a reality!

A big thanks to David and the whole community for the hard work in getting this done!

This was the 3rd attempt to get the feature in Gerrit after a couple of issues encountered along the path.

Why Git protocol v2?

The Git protocol v2 introduces a big optimization in the way client and server communicate during clones and fetches.

The big change has been the possibility of filtering server-side the refs not required by the client. In the previous version of the protocol, whenever a client was issuing a fetch, all the references were sent from the server to the client, even if the client was fetching a single ref!

In Gerrit this issue was even more evident, since, as you might know, Gerrit leverages a lot the refs for its internal functionality, even more with the introduction of NoteDb.

Whenever you are creating a Change in Gerrit you are updating/creating at least 3 refs:

  • refs/changes/NN/<change-num>/<patch-set>
  • refs/changes/NN/<change-num>/meta
  • refs/sequences/changes

In the Gerrit project itself, there are currently about 104K refs/change and 24K refs/change/*/meta. Imagine you are updating a repo which is behind just a couple of commits, you will get all those references which will take up most of your bandwidth.

Git protocol v2 will avoid this, just sending you back the references that the Git client requested.

Is it really faster?

Let’s see if it really does what is written on the tin. We have enabled Gerrit v2 at the end of 2019 on GerritHub.io, so let’s test it there. You will need a Git client from version 2.18 onwards.

> git clone "ssh://barbasa@review.gerrithub.io:29418/GerritCodeReview/gerrit"
> cd gerrit
> export GIT_TRACE_PACKET=1
> git -c protocol.version=2 fetch --no-tags origin master
19:16:34.583720 pkt-line.c:80           packet:        fetch< version 2
19:16:34.585050 pkt-line.c:80           packet:        fetch< ls-refs
19:16:34.585064 pkt-line.c:80           packet:        fetch< fetch=shallow
19:16:34.585076 pkt-line.c:80           packet:        fetch< server-option
19:16:34.585084 pkt-line.c:80           packet:        fetch< 0000
19:16:34.585094 pkt-line.c:80           packet:        fetch> command=ls-refs
19:16:34.585107 pkt-line.c:80           packet:        fetch> 0001
19:16:34.585116 pkt-line.c:80           packet:        fetch> peel
19:16:34.585124 pkt-line.c:80           packet:        fetch> symrefs
19:16:34.585133 pkt-line.c:80           packet:        fetch> ref-prefix master
19:16:34.585142 pkt-line.c:80           packet:        fetch> ref-prefix refs/master
19:16:34.585151 pkt-line.c:80           packet:        fetch> ref-prefix refs/tags/master
19:16:34.585160 pkt-line.c:80           packet:        fetch> ref-prefix refs/heads/master
19:16:34.585168 pkt-line.c:80           packet:        fetch> ref-prefix refs/remotes/master
19:16:34.585177 pkt-line.c:80           packet:        fetch> ref-prefix refs/remotes/master/HEAD
19:16:34.585186 pkt-line.c:80           packet:        fetch> 0000
19:16:35.052622 pkt-line.c:80           packet:        fetch< d21ee1980f6db7a0845e6f9732471909993a205c refs/heads/master
19:16:35.052687 pkt-line.c:80           packet:        fetch< 0000
From ssh://review.gerrithub.io:29418/GerritCodeReview/gerrit
 * branch                  master     -> FETCH_HEAD
19:16:35.175324 pkt-line.c:80           packet:        fetch> 0000

> git -c protocol.version=1 fetch --no-tags origin master
19:16:57.035135 pkt-line.c:80           packet:        fetch< d21ee1980f6db7a0845e6f9732471909993a205c HEAD\0 include-tag multi_ack_detailed multi_ack ofs-delta side-band side-band-64k thin-pack no-progress shallow agent=JGit/unknown symref=HEAD:refs/heads/master
19:16:57.037456 pkt-line.c:80           packet:        fetch< 07c8a169d6341c586a10163e895973f1bdccff92 refs/changes/00/100000/1
19:16:57.037489 pkt-line.c:80           packet:        fetch< 0014ca6443ac0af338e2677b45e538782bb7a12e refs/changes/00/100000/meta
19:16:57.037502 pkt-line.c:80           packet:        fetch< b4af8cad4d3982a0bba763a5e681d26078da5a0e refs/changes/00/100400/1
19:16:57.037513 pkt-line.c:80           packet:        fetch< 9ec6e507c493f4f1905cd090b47447e66b51b7e1 refs/changes/00/100400/meta
19:16:57.037523 pkt-line.c:80           packet:        fetch< a80359367529288eea3c283e7d542164bced1e2f refs/changes/00/100800/1
19:16:57.037533 pkt-line.c:80           packet:        fetch< 170cced6d81c25d1082d95e50b37883e113efd01 refs/changes/00/100800/meta
19:16:57.037544 pkt-line.c:80           packet:        fetch< 6cb616e0ad4b3274d4b728f8f7b641b6bd22dce4 refs/changes/00/100900/1
19:16:57.037554 pkt-line.c:80           packet:        fetch< 286d1ee1574127b76c4c1a6ef0f918ad4c61953a refs/changes/00/100900/meta
19:16:57.037606 pkt-line.c:80           packet:        fetch< 312ba566d2620b43fb90be3e7c406949edf6b6d9 refs/changes/00/10100/1
19:16:57.037619 pkt-line.c:80           packet:        fetch< dde4b73cb011178584aae4fb29a528018149d20b refs/changes/00/10100/meta

…. This will go on forever …. 

As you can see there is a massive difference in the data sent back on the wire!

How to enable it?

If you want to enable it, you just need to update you git config (etc/jgit.config in 3.1 and $HOME/.gitconfig in previous versions) with the protocol version to enable it and restart your server:

[protocol]
  version = 2

Enjoy your new blazing fast protocol!

If you are interested in more details about the Git v2 protocol you can find the specs here.

Fabio Ponciroli (GerritForge)
Gerrit Code Review Contributor

Crunch Code Review hashtags with Gerrit DevOps Analytics

Screenshot 2020-05-12 at 11.13.06.pngWe have already discussed in previous posts how important it is to speedup the feedback loop in your Software Development Lifecycle. Having early feedbacks gives you the chance of evaluating your hypothesis and eventually change direction if needed. 

The more information you have, the smarter can be your decisions.

We recently added in our Gerrit DevOps Analytics the possibility of extracting data coming from Code Reviews’ metadata to extend the knowledge we can get out of Gerrit.

Furthermore, it is possible to extract meta-data from repositories not necessarily hosted on the Gerrit instance running the analytics processing. This is a big improvement since it allows to fully analyse repositories coming from any Gerrit server.

For example, the Gerrit analytics we are providing on https://analytics.gerrithub.io are coming from the Gerrit repository hosted on the gerrit-review.googlesource.com, the Gerrit server hosted by Google.

Hashtags aggregation

One important type of meta-data contained in the Code Reviews is the hashtag.

Hashtags are freeform strings associated with a change, like on social media platforms. In Gerrit, you explicitly associate hashtags with changes using a dedicated area of the UI; they are not parsed from commit messages or comments.

Similar to topics, hashtags can be used to group related changes together and to search using the hashtag: operator. Unlike topics, a change can have multiple hashtags, and they are only used for informational grouping; changes with the same hashtags are not necessarily submitted together.

You can use them, for example, to mark and easily search all the changes blocking a particular release:

Screenshot 2020-05-12 at 10.43.00.png

Hashtags can also be used to aggregate all the changes people have been working on during a particular event, for example, the Gerrit User Summit 2019 hackathon:

Screenshot 2020-05-12 at 10.44.39.png

The latest version of the Gerrit Analytics plugin exposes the hashtags attached to their respecting Git commit data. Let’s explore together some use cases:

The most popular Gerrit Code Review hashtags over the last 12 months

Screenshot 2020-05-12 at 10.47.49.png

Throughput of changes created during an event

see for example the Palo alto hackathon (#palo-alto-2018). We can see at the end of the week the spike of changes to release Gerrit 2.16.

Screenshot 2020-05-12 at 10.56.44.png

The extend of time for a feature

Removing GWT was an extensive effort which started in 2017 and ended in 2019. It took several hackathons to tackle the removal as shown by the hashtags distribution. Some changes were started in one hackathon and finalised in the next one.

Screenshot 2020-05-12 at 11.05.51.png

Those were some example of useful information on how to leverage the power of GDA.

The above examples are taken from the GDA dashboard provided and hosted by GerritForge on https://analytics.gerrithub.io which mirror commits and reviews on a regular basis from the Gerrit project and its plugin ecosystem.

How to setup GDA on Gerrit

Hashtag extraction is currently available from Gerrit 3.1 onwards. You can download the latest version released from the Gerrit CI.

To enable hashtag extraction you need to enable the feature extraction in the plugin config file as follow:

# analitycs.config
[contributors]
  extract-hashtags = true

For more information on how to configure and run the plugin, look at the analytics plugin documentation.

Conclusion

Data is the goldmine of your company. You need more and more of it for making smarter decision. The latest version of the GDA allows you to leverage even more data produced during the code review process.

You can explore the potential of the information held in Gerrit on the analytics dashboard provided by GerritForge on analytics.gerrithub.io.

If you would like your open source Gerrit hosted project to be added to our dashboard or would need help in setting up and supporting GDA for your organization, get in touch with GerritForge Sales Team and we can help you making smarter decisions today.