KWON BYUNGCHANG created BIGTOP-4543:
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Summary: hadoop: mvn site intermittently fails under parallel build
Key: BIGTOP-4543
URL: https://issues.apache.org/jira/browse/BIGTOP-4543
Project: Bigtop
Issue Type: Bug
Reporter: KWON BYUNGCHANG
When Bigtop builds hadoop with Maven parallel mode (-T), the site goal
intermittently fails:
{code}
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-site-plugin:3.9.1:site (default-site) on project
hadoop-aws: Execution default-site of goal
org.apache.maven.plugins:maven-site-plugin:3.9.1:site failed: Cannot invoke
"String.length()" because "s" is null -> [Help 1]
{code}
Root cause: the site mojo in maven-site-plugin 3.9.1 is not marked @threadSafe:
{code}
@Mojo( name = "site", requiresDependencyResolution = ResolutionScope.TEST,
requiresReports = true )
{code}
With -T, Maven only warns about non-thread-safe plugins and still runs them in
parallel. Concurrent site executions across modules race on shared components
(Doxia SiteRenderer, Velocity, plexus), which surfaces as the NPE above. The
failure is non-deterministic and the failing module varies between runs.
Fix: in the hadoop do-component-build, run the mvn site invocation with -T 1,
keeping parallelism for the main build.
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