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https://issues.apache.org/jira/browse/HDDS-2332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955482#comment-16955482
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YiSheng Lien commented on HDDS-2332:
------------------------------------
Hi [~ljain], Would you show the condition to reproduce the issue ?
> BlockOutputStream#waitOnFlushFutures blocks on putBlock combined future
> -----------------------------------------------------------------------
>
> Key: HDDS-2332
> URL: https://issues.apache.org/jira/browse/HDDS-2332
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Client
> Reporter: Lokesh Jain
> Priority: Major
>
> BlockOutputStream blocks on waitOnFlushFutures call. Two jstacks show that
> the thread is blocked on the same condition.
> {code:java}
> 2019-10-18 06:30:38
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.141-b15 mixed mode):
> "main" #1 prio=5 os_prio=0 tid=0x00007fbea001a800 nid=0x2a56 waiting on
> condition [0x00007fbea96d6000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000e4739888> (a
> java.util.concurrent.CompletableFuture$Signaller)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693)
> at
> java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323)
> at
> java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729)
> at
> java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.waitOnFlushFutures(BlockOutputStream.java:518)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.handleFlush(BlockOutputStream.java:481)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.close(BlockOutputStream.java:496)
> at
> org.apache.hadoop.ozone.client.io.BlockOutputStreamEntry.close(BlockOutputStreamEntry.java:143)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.handleFlushOrClose(KeyOutputStream.java:439)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.handleWrite(KeyOutputStream.java:232)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.write(KeyOutputStream.java:190)
> at
> org.apache.hadoop.fs.ozone.OzoneFSOutputStream.write(OzoneFSOutputStream.java:46)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:57)
> at java.io.DataOutputStream.write(DataOutputStream.java:107)
> - locked <0x00000000a6a75930> (a
> org.apache.hadoop.fs.FSDataOutputStream)
> at
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter.write(TeraOutputFormat.java:77)
> - locked <0x00000000a6a75918> (a
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter)
> at
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter.write(TeraOutputFormat.java:64)
> at
> org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.write(MapTask.java:670)
> at
> org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
> at
> org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
> at
> org.apache.hadoop.examples.terasort.TeraGen$SortGenMapper.map(TeraGen.java:230)
> at
> org.apache.hadoop.examples.terasort.TeraGen$SortGenMapper.map(TeraGen.java:203)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1876)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
> 2019-10-18 07:02:50
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.141-b15 mixed mode):
> "main" #1 prio=5 os_prio=0 tid=0x00007fbea001a800 nid=0x2a56 waiting on
> condition [0x00007fbea96d6000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000e4739888> (a
> java.util.concurrent.CompletableFuture$Signaller)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693)
> at
> java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323)
> at
> java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729)
> at
> java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.waitOnFlushFutures(BlockOutputStream.java:518)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.handleFlush(BlockOutputStream.java:481)
> at
> org.apache.hadoop.hdds.scm.storage.BlockOutputStream.close(BlockOutputStream.java:496)
> at
> org.apache.hadoop.ozone.client.io.BlockOutputStreamEntry.close(BlockOutputStreamEntry.java:143)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.handleFlushOrClose(KeyOutputStream.java:439)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.handleWrite(KeyOutputStream.java:232)
> at
> org.apache.hadoop.ozone.client.io.KeyOutputStream.write(KeyOutputStream.java:190)
> at
> org.apache.hadoop.fs.ozone.OzoneFSOutputStream.write(OzoneFSOutputStream.java:46)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:57)
> at java.io.DataOutputStream.write(DataOutputStream.java:107)
> - locked <0x00000000a6a75930> (a
> org.apache.hadoop.fs.FSDataOutputStream)
> at
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter.write(TeraOutputFormat.java:77)
> - locked <0x00000000a6a75918> (a
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter)
> at
> org.apache.hadoop.examples.terasort.TeraOutputFormat$TeraRecordWriter.write(TeraOutputFormat.java:64)
> at
> org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.write(MapTask.java:670)
> at
> org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
> at
> org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
> at
> org.apache.hadoop.examples.terasort.TeraGen$SortGenMapper.map(TeraGen.java:230)
> at
> org.apache.hadoop.examples.terasort.TeraGen$SortGenMapper.map(TeraGen.java:203)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1876)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
> {code}
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