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https://issues.apache.org/jira/browse/MNG-7433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519781#comment-17519781
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Dan Tran commented on MNG-7433:
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Thanks for the suggestion regarding 'aggregating mojo', I found the consistent
pattern where
* after sonar-analysis module execution invoked mdev:sonar ( aggregating
mojo which spins a maven instance to run sonar:sonar), other thread is blocked
when it runs any aggregating mojos
we have a number of internal mojos with 'aggregator = true' set at @Mojo
annotation used during the build process.
We set it this way so that it is not running in reactor mode in default
My guess here is I need to update all internal mojos with aggregator=false.
btw buildnumber-m-p also in same category
is it something Maven team can fix in 3.9?
> [REGRESSION] Multiple maven instances working on same source tree can lock
> each other
> -------------------------------------------------------------------------------------
>
> Key: MNG-7433
> URL: https://issues.apache.org/jira/browse/MNG-7433
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.8.5
> Reporter: Dan Tran
> Priority: Major
>
> I have a large multi modules java maven build where:
> * phase 1 - basic build + unit tests + jacoco - 40 min
> * phase 2 - sonar:sonar 20 min
> * phase 3 - final packaging and basic smoke-test - 20 min
> To take advantage of Maven multi-threaded build, during the reactor build,
> one of our maven module spins another instance of Maven to run sonar:sonar
> goal right after the basic build is done.
> This means our phase 2 and phase 3 run in parallel sharing the same source
> tree, same local maven repo (where sonar:sonar should have all needed
> dependencies at the share local maven repo to run its task)
> With maven-3.8.5, parallelization is no longer possible, phase 3 is blocked
> until phase 2 is done.
> I am able to trace it to https://github.com/apache/maven/pull/628 where the
> locking started the happen
> How does the lock mechanic work? there must be a local file where both Maven
> instances are watching each other. Is there an option to disable this lock?
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