[ https://issues.apache.org/jira/browse/OAK-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14709347#comment-14709347 ]
Francesco Mari commented on OAK-3235: ------------------------------------- {{SegmentWriter.flush()}} is not so different in the 1.0 and 1.2 branches, backporting shouldn't be a problem. > Deadlock when closing a concurrently used FileStore > --------------------------------------------------- > > Key: OAK-3235 > URL: https://issues.apache.org/jira/browse/OAK-3235 > Project: Jackrabbit Oak > Issue Type: Bug > Components: segmentmk > Affects Versions: 1.3.3 > Reporter: Francesco Mari > Assignee: Michael Dürig > Priority: Critical > Fix For: 1.3.5 > > Attachments: OAK-3235-01.patch > > > A deadlock was detected while stopping the {{SegmentCompactionIT}} using the > exposed MBean. > {noformat} > Found one Java-level deadlock: > ============================= > "pool-1-thread-23": > waiting to lock monitor 0x00007fa8cf1f0488 (object 0x00000007a0081e48, a > org.apache.jackrabbit.oak.plugins.segment.file.FileStore), > which is held by "main" > "main": > waiting to lock monitor 0x00007fa8cc015ff8 (object 0x00000007a011f750, a > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter), > which is held by "pool-1-thread-23" > Java stack information for the threads listed above: > =================================================== > "pool-1-thread-23": > at > org.apache.jackrabbit.oak.plugins.segment.file.FileStore.writeSegment(FileStore.java:948) > - waiting to lock <0x00000007a0081e48> (a > org.apache.jackrabbit.oak.plugins.segment.file.FileStore) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.flush(SegmentWriter.java:228) > - locked <0x00000007a011f750> (a > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.prepare(SegmentWriter.java:329) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeListBucket(SegmentWriter.java:447) > - locked <0x00000007a011f750> (a > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeList(SegmentWriter.java:698) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1190) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter$2.childNodeChanged(SegmentWriter.java:1135) > at > org.apache.jackrabbit.oak.plugins.memory.ModifiedNodeState.compareAgainstBaseState(ModifiedNodeState.java:400) > 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:400) > 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:400) > 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:400) > 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:400) > 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:400) > 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:400) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1126) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeNode(SegmentWriter.java:1154) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.getNodeState(SegmentNodeBuilder.java:100) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.updated(SegmentNodeBuilder.java:85) > at > org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.updated(MemoryNodeBuilder.java:214) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeBuilder.updated(SegmentNodeBuilder.java:81) > at > org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder.setChildNode(MemoryNodeBuilder.java:346) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeAdded(AbstractRebaseDiff.java:211) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:527) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:531) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:418) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord$2.childNodeChanged(MapRecord.java:404) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:488) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:394) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.spi.state.AbstractRebaseDiff.childNodeChanged(AbstractRebaseDiff.java:219) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:488) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compareBranch(MapRecord.java:565) > at > org.apache.jackrabbit.oak.plugins.segment.MapRecord.compare(MapRecord.java:470) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.compareAgainstBaseState(SegmentNodeState.java:583) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.prepare(SegmentNodeStore.java:446) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.optimisticMerge(SegmentNodeStore.java:471) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore$Commit.execute(SegmentNodeStore.java:527) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentNodeStore.merge(SegmentNodeStore.java:205) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:426) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomWriter.call(SegmentCompactionIT.java:399) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) > at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > "main": > at > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.dropCache(SegmentWriter.java:850) > - waiting to lock <0x00000007a011f750> (a > org.apache.jackrabbit.oak.plugins.segment.SegmentWriter) > at > org.apache.jackrabbit.oak.plugins.segment.file.FileStore.close(FileStore.java:830) > - locked <0x00000007a0081e48> (a > org.apache.jackrabbit.oak.plugins.segment.file.FileStore) > at > org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT.tearDown(SegmentCompactionIT.java:266) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:497) > at > org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) > at > org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) > at > org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) > at > org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:36) > at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) > at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) > at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) > at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) > at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) > at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) > at org.junit.runners.ParentRunner.run(ParentRunner.java:300) > at > org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252) > at > org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141) > at > org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:497) > at > org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189) > at > org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165) > at > org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85) > at > org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115) > at > org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75) > Found 1 deadlock. > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)