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https://issues.apache.org/jira/browse/ACCUMULO-3783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14601778#comment-14601778
]
Josh Elser commented on ACCUMULO-3783:
--------------------------------------
Wow, this is actually really obnoxious.
The code avoids the problem of informing all other threads of the classloader
to use by assuming that all other threads will have the same underlying
FileSystem, Configuration and ClassLoader (from the Configuration). So, the
assumption that we can give the VFS classes their own FileSystem instance would
result in the FileSystem objects in use over the rest of the codebase wouldn't
see the VFS classloader.
> Unexpected Filesystem Closed exceptions
> ---------------------------------------
>
> Key: ACCUMULO-3783
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3783
> Project: Accumulo
> Issue Type: Bug
> Components: master, start, tserver
> Affects Versions: 1.7.0
> Reporter: Josh Elser
> Assignee: Josh Elser
> Fix For: 1.7.1, 1.8.0
>
>
> Noticed this in testing 1.7.0 on my laptop tonight. Started two tservers, one
> continuous ingest client and would kill/restart one of the tservers
> occasionally.
> {noformat}
> Failed to close map file
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at
> org.apache.hadoop.hdfs.DFSInputStream.close(DFSInputStream.java:629)
> at java.io.FilterInputStream.close(FilterInputStream.java:181)
> at
> org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$Reader.close(CachableBlockFile.java:409)
> at
> org.apache.accumulo.core.file.rfile.RFile$Reader.close(RFile.java:921)
> at
> org.apache.accumulo.tserver.tablet.Compactor.compactLocalityGroup(Compactor.java:391)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:214)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> null
> java.nio.channels.ClosedChannelException
> at
> org.apache.hadoop.hdfs.DFSOutputStream.checkClosed(DFSOutputStream.java:1622)
> at
> org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:104)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:58)
> at java.io.DataOutputStream.write(DataOutputStream.java:107)
> at
> org.apache.accumulo.core.file.rfile.bcfile.SimpleBufferedOutputStream.flushBuffer(SimpleBufferedOutputStream.java:39)
> at
> org.apache.accumulo.core.file.rfile.bcfile.SimpleBufferedOutputStream.flush(SimpleBufferedOutputStream.java:68)
> at
> org.apache.hadoop.io.compress.CompressionOutputStream.flush(CompressionOutputStream.java:69)
> at
> org.apache.accumulo.core.file.rfile.bcfile.Compression$FinishOnFlushCompressionStream.flush(Compression.java:66)
> at
> java.io.BufferedOutputStream.flush(BufferedOutputStream.java:141)
> at
> org.apache.accumulo.core.file.rfile.bcfile.BCFile$Writer$WBlockState.finish(BCFile.java:233)
> at
> org.apache.accumulo.core.file.rfile.bcfile.BCFile$Writer$BlockAppender.close(BCFile.java:320)
> at
> org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile$BlockWrite.close(CachableBlockFile.java:121)
> at
> org.apache.accumulo.core.file.rfile.RFile$Writer.closeBlock(RFile.java:398)
> at
> org.apache.accumulo.core.file.rfile.RFile$Writer.append(RFile.java:382)
> at
> org.apache.accumulo.tserver.tablet.Compactor.compactLocalityGroup(Compactor.java:356)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:214)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> Filesystem closed
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:1927)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:638)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$12.doCall(DistributedFileSystem.java:634)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:634)
> at
> org.apache.accumulo.server.fs.VolumeManagerImpl.deleteRecursively(VolumeManagerImpl.java:193)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:255)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> MinC failed (null) to create
> hdfs://localhost:8020/accumulo17/tables/2/t-0000011/F00000yd.rf_tmp retrying
> ...
> MajC Failed, extent = 2;5;45
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1651)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1593)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:397)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:337)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:908)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:889)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:126)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:106)
> at
> org.apache.accumulo.core.file.DispatchingFileFactory.openWriter(DispatchingFileFactory.java:78)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:192)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> MajC Failed, extent = 2;45;4
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1651)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1593)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:397)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:337)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:908)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:889)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:126)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:106)
> at
> org.apache.accumulo.core.file.DispatchingFileFactory.openWriter(DispatchingFileFactory.java:78)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:192)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> MajC Failed, extent = 2;35;3
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1651)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1593)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:397)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:337)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:908)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:889)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:126)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:106)
> at
> org.apache.accumulo.core.file.DispatchingFileFactory.openWriter(DispatchingFileFactory.java:78)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:192)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> Filesystem closed
> java.io.IOException: Filesystem closed
> at
> org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:795)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1651)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1593)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:397)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:393)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:337)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:908)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:889)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:126)
> at
> org.apache.accumulo.core.file.rfile.RFileOperations.openWriter(RFileOperations.java:106)
> at
> org.apache.accumulo.core.file.DispatchingFileFactory.openWriter(DispatchingFileFactory.java:78)
> at
> org.apache.accumulo.tserver.tablet.Compactor.call(Compactor.java:192)
> at
> org.apache.accumulo.tserver.tablet.Tablet._majorCompact(Tablet.java:1981)
> at
> org.apache.accumulo.tserver.tablet.Tablet.majorCompact(Tablet.java:2098)
> at
> org.apache.accumulo.tserver.tablet.CompactionRunner.run(CompactionRunner.java:44)
> at
> org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> org.apache.accumulo.fate.util.LoggingRunnable.run(LoggingRunnable.java:35)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> This reminded me of something that [~bills] ran into and tried to get to the
> bottom of.
> My hunch was that somethign registered a shutdown hook which closed the
> filesystem object. I also remembered that FileSystem instances are cached.
> Bill pointed out that he thought this might still be a VFS related issue
> (despite having nothign to do with VFS). After I noticed a shutdown hook in
> our VFS usage, I think it's unsafe to be sharing FileSystem instances with
> VFS code that might also be used by Accumulo for important things like
> writing to files.
> We should get a unique FileSystem instance to provide to any VFS code. We can
> do this by:
> # Setting {{fs.hdfs.impl.disable.cache}} in the Hadoop Configuration we
> provide to {{FileSystem.get(Configuration)}}
> # Call {{FileSystem.newInstance(URI, Configuration)}}.
> Either seem to do what we want -- the latter possibly having more reliable
> semantics than just a configuration value.
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