[OAK-7332] Benchmarks failure on Oak-Segment-* fixtures due to concurrentlinkedhashmap version conflict

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.9.0, 1.10.0
• Component/s: benchmarks, segment-tar
• Assignee: Andrei Dulceanu
• Reporter: Andrei Dulceanu
• Created: 12/Mar/18 14:39
• Updated: 26/Apr/18 13:22
• Resolved: 13/Mar/18 12:11

Description

The changes needed for OAK-7259 rely on com.googlecode.concurrentlinkedhashmap/concurrentlinkedhashmap-lru 1.4.2, which is embedded in oak-segment-tar. This conflicts with the transitive dependency coming from org.apache.solr/solr-core in oak-benchmarks, which depends on concurrentlinkedhashmap-lru 1.2. Therefore, running benchmarks on Oak-Segment-* fixtures fails with the following exception:

04:35:44 Exception in thread "main" java.lang.NoSuchMethodError: com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap$Builder.maximumWeightedCapacity(J)Lcom/googlecode/concurrentlinkedhashmap/ConcurrentLinkedHashMap$Builder;
04:35:44     at org.apache.jackrabbit.oak.segment.CommitsTracker.<init>(CommitsTracker.java:57)
04:35:44     at org.apache.jackrabbit.oak.segment.CommitsTracker.<init>(CommitsTracker.java:51)
04:35:44     at org.apache.jackrabbit.oak.segment.SegmentNodeStoreStats.<init>(SegmentNodeStoreStats.java:64)
04:35:44     at org.apache.jackrabbit.oak.segment.scheduler.LockBasedScheduler.<init>(LockBasedScheduler.java:171)
04:35:44     at org.apache.jackrabbit.oak.segment.scheduler.LockBasedScheduler$ObservableLockBasedScheduler.<init>(LockBasedScheduler.java:352)
04:35:44     at org.apache.jackrabbit.oak.segment.scheduler.LockBasedScheduler$LockBasedSchedulerBuilder.build(LockBasedScheduler.java:100)
04:35:44     at org.apache.jackrabbit.oak.segment.SegmentNodeStore.<init>(SegmentNodeStore.java:169)
04:35:44     at org.apache.jackrabbit.oak.segment.SegmentNodeStore.<init>(SegmentNodeStore.java:63)
04:35:44     at org.apache.jackrabbit.oak.segment.SegmentNodeStore$SegmentNodeStoreBuilder.build(SegmentNodeStore.java:121)
04:35:44     at org.apache.jackrabbit.oak.fixture.SegmentTarFixture.setUpCluster(SegmentTarFixture.java:211)
04:35:44     at org.apache.jackrabbit.oak.fixture.OakRepositoryFixture.setUpCluster(OakRepositoryFixture.java:145)
04:35:44     at org.apache.jackrabbit.oak.fixture.OakRepositoryFixture.setUpCluster(OakRepositoryFixture.java:141)
04:35:44     at org.apache.jackrabbit.oak.benchmark.AbstractTest.createRepository(AbstractTest.java:655)
04:35:44     at org.apache.jackrabbit.oak.benchmark.AbstractTest.run(AbstractTest.java:202)
04:35:44     at org.apache.jackrabbit.oak.benchmark.BenchmarkRunner.main(BenchmarkRunner.java:516)
04:35:44     at org.apache.jackrabbit.oak.run.BenchmarkCommand.execute(BenchmarkCommand.java:27)
04:35:44     at org.apache.jackrabbit.oak.run.Main.main(Main.java:54)

A possible solution to mitigate this is to exclude the transitive dependency to com.googlecode.concurrentlinkedhashmap/concurrentlinkedhashmap-lru from org.apache.solr/solr-core in oak-benchmarks.

Issue Links

• relates to: OAK-7259 Improve SegmentNodeStoreStats to include number of commits per thread and threads currently waiting on the semaphore