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https://issues.apache.org/jira/browse/OAK-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660115#comment-14660115
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Michael Dürig commented on OAK-3179:
------------------------------------
OAK-2862 needs to be merged first should we decide to merge this.
> Deadlock between persisted compaction map and cleanup
> -----------------------------------------------------
>
> Key: OAK-3179
> URL: https://issues.apache.org/jira/browse/OAK-3179
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> Components: segmentmk
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Critical
> Labels: cleanup, compaction, gc
> Fix For: 1.3.4
>
>
> Just seen this deadlock while running {{SegmentCompactionIT}}:
> {noformat}
> "TarMK flush thread [target/SegmentCompactionIT3250704011919039778dir],
> active since Wed Aug 05 09:25:57 GMT+00:00 2015, previous max duration
> 2325ms" daemon prio=10 tid=0x00007f5674872800 nid=0x5dc8 waiting for monitor
> entry [0x00007f5666a00000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentId.getSegment(SegmentId.java:145)
> - waiting to lock <0x0000000707fc7fe8> (a
> org.apache.jackrabbit.oak.plugins.segment.SegmentId)
> at
> org.apache.jackrabbit.oak.plugins.segment.Record.getSegment(Record.java:82)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:154)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:186)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:186)
> at
> org.apache.jackrabbit.oak.plugins.segment.PersistedCompactionMap.compress(PersistedCompactionMap.java:204)
> at
> org.apache.jackrabbit.oak.plugins.segment.PersistedCompactionMap.remove(PersistedCompactionMap.java:155)
> at
> org.apache.jackrabbit.oak.plugins.segment.CompactionMap.remove(CompactionMap.java:108)
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore.cleanup(FileStore.java:694)
> - locked <0x000000070017b330> (a
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore)
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore.flush(FileStore.java:628)
> - locked <0x000000070017b330> (a
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore)
> - locked <0x00000007000aed60> (a
> java.util.concurrent.atomic.AtomicReference)
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore$1.run(FileStore.java:413)
> at java.lang.Thread.run(Thread.java:745)
> at
> org.apache.jackrabbit.oak.plugins.segment.file.BackgroundThread.run(BackgroundThread.java:70)
> "pool-1-thread-34" prio=10 tid=0x00007f55ec002800 nid=0x5dea waiting for
> monitor entry [0x00007f56648de000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore.readSegment(FileStore.java:904)
> - waiting to lock <0x000000070017b330> (a
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentTracker.readSegment(SegmentTracker.java:210)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentId.getSegment(SegmentId.java:149)
> - locked <0x0000000707fc7fe8> (a
> org.apache.jackrabbit.oak.plugins.segment.SegmentId)
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.readString(Segment.java:400)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:215)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:186)
> at
> org.apache.jackrabbit.oak.plugins.segment.MapRecord.getEntry(MapRecord.java:186)
> at
> org.apache.jackrabbit.oak.plugins.segment.PersistedCompactionMap.get(PersistedCompactionMap.java:121)
> at
> org.apache.jackrabbit.oak.plugins.segment.PersistedCompactionMap.get(PersistedCompactionMap.java:103)
> at
> org.apache.jackrabbit.oak.plugins.segment.CompactionMap.get(CompactionMap.java:93)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.uncompact(SegmentWriter.java:1074)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1098)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1154)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1154)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1154)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135)
> at
> org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:399)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.getNodeState(SegmentNodeBuilder.java:100)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.<init>(SegmentNodeStore.java:418)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore.merge(SegmentNodeStore.java:204)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:433)
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:406)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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