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https://issues.apache.org/jira/browse/CASSANDRA-16143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17241918#comment-17241918
]
Yifan Cai commented on CASSANDRA-16143:
---------------------------------------
Thanks [~aholmber]. So the bot links the PR, if its title starts with the
ticket number.
> Streaming fails when s SSTable writer finish() exceeds
> internode_tcp_user_timeout
> ---------------------------------------------------------------------------------
>
> Key: CASSANDRA-16143
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16143
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Internode
> Reporter: Jon Meredith
> Assignee: Yifan Cai
> Priority: Normal
> Fix For: 4.0-beta
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> tl;dr The internode TCP user timeout that provides more responsive detection
> of dead nodes for internode message will cause streaming to fail if system
> calls to fsync/fdatasync exceed the timeout (default 30s).
> To workaround, explicitly set internode_tcp_user_timeout to longer than
> fsync/fdatasync, or to zero to revert to the operating system default.
> Details:
> While bootstrapping a replacement 4.0beta3 node in an existing cluster,
> bootstrap streaming repeatedly failed with the streaming follower logging
> {code:java}
> ERROR 2020-09-10T14:29:34,711 [NettyStreaming-Outbound-1.1.1.1.7000:1]
> org.apache.cassandra.streaming.StreamSession:693 - [Stream
> #7cb67c00-f3ac-11ea-b940-f7836f164528] Streaming error occurred on session
> with peer 1.1.1.1:7000
> org.apache.cassandra.net.AsyncChannelOutputPlus$FlushException: The channel
> this output stream was writing to has been closed
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.propagateFailedFlush(AsyncChannelOutputPlus.java:200)
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.waitUntilFlushed(AsyncChannelOutputPlus.java:158)
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.waitForSpace(AsyncChannelOutputPlus.java:140)
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.beginFlush(AsyncChannelOutputPlus.java:97)
> at
> org.apache.cassandra.net.AsyncStreamingOutputPlus.lambda$writeToChannel$0(AsyncStreamingOutputPlus.java:142)
> at
> org.apache.cassandra.db.streaming.CassandraCompressedStreamWriter.lambda$write$0(CassandraCompressedStreamWriter.java:90)
> at
> org.apache.cassandra.net.AsyncStreamingOutputPlus.writeToChannel(AsyncStreamingOutputPlus.java:138)
> at
> org.apache.cassandra.db.streaming.CassandraCompressedStreamWriter.write(CassandraCompressedStreamWriter.java:89)
> at
> org.apache.cassandra.db.streaming.CassandraOutgoingFile.write(CassandraOutgoingFile.java:180)
> at
> org.apache.cassandra.streaming.messages.OutgoingStreamMessage.serialize(OutgoingStreamMessage.java:87)
> at
> org.apache.cassandra.streaming.messages.OutgoingStreamMessage$1.serialize(OutgoingStreamMessage.java:45)
> at
> org.apache.cassandra.streaming.messages.OutgoingStreamMessage$1.serialize(OutgoingStreamMessage.java:34)
> at
> org.apache.cassandra.streaming.messages.StreamMessage.serialize(StreamMessage.java:40)
> at
> org.apache.cassandra.streaming.async.NettyStreamingMessageSender$FileStreamTask.run(NettyStreamingMessageSender.java:347)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
> at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> [?:?]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> [?:?]
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> [netty-all-4.1.50.Final.jar:4.1.50.Final]
> at java.lang.Thread.run(Thread.java:834) [?:?]
> Suppressed: java.nio.channels.ClosedChannelException
> at
> org.apache.cassandra.net.AsyncStreamingOutputPlus.doFlush(AsyncStreamingOutputPlus.java:78)
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.flush(AsyncChannelOutputPlus.java:229)
> at
> org.apache.cassandra.net.AsyncChannelOutputPlus.close(AsyncChannelOutputPlus.java:248)
> at
> org.apache.cassandra.streaming.async.NettyStreamingMessageSender$FileStreamTask.run(NettyStreamingMessageSender.java:348)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
> at java.util.concurrent.FutureTask.run(FutureTask.java:264)
> [?:?]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> [?:?]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> [?:?]
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> [netty-all-4.1.50.Final.jar:4.1.50.Final]
> at java.lang.Thread.run(Thread.java:834) [?:?]
> Caused by: io.netty.channel.unix.Errors$NativeIoException: writeAddress(..)
> failed: Connection timed out
> {code}
> and the boostrapping node (the streaming initiator) logging (times are from
> two separate attempts, pattern was very similar each time, IP addresses
> doctored to protect the innocent)
> {code:java}
> ERROR 2020-09-11T09:45:54,720 [Stream-Deserializer-2.2.2.2:7000-93837c82]
> org.apache.cassandra.streaming.StreamSession:917 - [Stream
> #f921ea30-f44d-11ea-b7f1-356e3edd6247] Remote peer 2.2.2.2:7000 failed stream
> session.
> DEBUG 2020-09-11T09:45:54,721 [Stream-Deserializer-2.2.2.2:7000-93837c82]
> org.apache.cassandra.streaming.StreamSession:510 - [Stream
> #f921ea30-f44d-11ea-b7f1-356e3edd6247] Will close attached channels
> {93837c82=[id: 0x93837c82, L:/1.1.1.1:56859 ! R:2.2.2.2/2.2.2.2:7000],
> a608109b=[id: 0xa608109b, L:/1.1.1.1:7000 - R:/2.2.2.2:49426]}
> INFO 2020-09-11T09:45:54,722 [Stream-Deserializer-2.2.2.2:7000-93837c82]
> org.apache.cassandra.streaming.StreamResultFuture:192 - [Stream
> #f921ea30-f44d-11ea-b7f1-356e3edd6247] Session with 2.2.2.2:7000 is complete
> DEBUG 2020-09-11T09:45:54,723 [Messaging-EventLoop-3-15]
> org.apache.cassandra.streaming.async.NettyStreamingMessageSender:553 -
> [Stream #f921ea30-f44d-11ea-b7f1-356e3edd6247] Closing stream connection
> channels on 2.2.2.2:7000
> ERROR 2020-09-11T09:45:55,121 [Stream-Deserializer-2.2.2.2:7000-a608109b]
> org.apache.cassandra.streaming.StreamSession:693 - [Stream
> #f921ea30-f44d-11ea-b7f1-356e3edd6247] Streaming error occurred on session
> with peer 2.2.2.2:7000
> org.apache.cassandra.streaming.StreamReceiveException: java.io.EOFException
> at
> org.apache.cassandra.streaming.messages.IncomingStreamMessage$1.deserialize(IncomingStreamMessage.java:60)
> at
> org.apache.cassandra.streaming.messages.IncomingStreamMessage$1.deserialize(IncomingStreamMessage.java:38)
> at
> org.apache.cassandra.streaming.messages.StreamMessage.deserialize(StreamMessage.java:51)
> at
> org.apache.cassandra.streaming.async.StreamingInboundHandler$StreamDeserializingTask.run(StreamingInboundHandler.java:172)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> [netty-all-4.1.50.Final.jar:4.1.50.Final]
> at java.lang.Thread.run(Thread.java:834) [?:?]
> Caused by: java.io.EOFException
> at
> org.apache.cassandra.net.AsyncStreamingInputPlus.reBuffer(AsyncStreamingInputPlus.java:133)
> at
> org.apache.cassandra.io.util.RebufferingInputStream.readByte(RebufferingInputStream.java:178)
> at
> org.apache.cassandra.io.util.RebufferingInputStream.readPrimitiveSlowly(RebufferingInputStream.java:142)
> at
> org.apache.cassandra.io.util.RebufferingInputStream.readLong(RebufferingInputStream.java:231)
> at
> org.apache.cassandra.io.compress.CompressionMetadata$ChunkSerializer.deserialize(CompressionMetadata.java:538)
> at
> org.apache.cassandra.io.compress.CompressionMetadata$ChunkSerializer.deserialize(CompressionMetadata.java:528)
> at
> org.apache.cassandra.db.streaming.CompressionInfo$CompressionInfoSerializer.deserialize(CompressionInfo.java:88)
> at
> org.apache.cassandra.db.streaming.CompressionInfo$CompressionInfoSerializer.deserialize(CompressionInfo.java:61)
> at
> org.apache.cassandra.db.streaming.CassandraStreamHeader$CassandraStreamHeaderSerializer.deserialize(CassandraStreamHeader.java:230)
> at
> org.apache.cassandra.db.streaming.CassandraStreamHeader$CassandraStreamHeaderSerializer.deserialize(CassandraStreamHeader.java:210)
> at
> org.apache.cassandra.db.streaming.CassandraStreamHeader$CassandraStreamHeaderSerializer.deserialize(CassandraStreamHeader.java:178)
> at
> org.apache.cassandra.db.streaming.CassandraIncomingFile.read(CassandraIncomingFile.java:69)
> at
> org.apache.cassandra.streaming.messages.IncomingStreamMessage$1.deserialize(IncomingStreamMessage.java:53)
> ... 5 more
> DEBUG 2020-09-11T09:45:55,123 [Stream-Deserializer-2.2.2.2:7000-93837c82]
> org.apache.cassandra.streaming.StreamSession:657 - [Stream
> #f921ea30-f44d-11ea-b7f1-356e3edd6247] Socket closed after session completed
> with state FAILED
> {code}
> The issue was repeatable across many attempts to bootstrap. Cluster was
> deployed on Linux hosts running a 4.1.x kernel.
> Investigating the cause of the NativeIoException error message showed that a
> write(2) call return must have been ETIMEDOUT, which occurs when a TCP user
> timeout is set on the socket. In 4.0 connections now do that when EPOLL is
> available, with a default of 30s to detect failures faster.
> Investigating the socket buffers around the time of crash showed the send
> buffer filling on the streaming follower and the receive buffer filling on
> the streaming initiator.
> Capturing a heap dump and analyzing with MAT showed a thread in this state
> until the stream failed.
> {code:java}
> Object / Stack Frame |Name |
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> io.netty.util.concurrent.FastThreadLocalThread @ 0x6916ea170
> |Stream-Deserializer-2.2.2.2:7000-a608109b|
> | - at sun.nio.ch.FileDispatcherImpl.force0(Ljava/io/FileDescriptor;Z)I
> (Native Method)| |
> | - at sun.nio.ch.FileDispatcherImpl.force(Ljava/io/FileDescriptor;Z)I
> (FileDispatcherImpl.java:82)| |
> | - at sun.nio.ch.FileChannelImpl.force(Z)V (FileChannelImpl.java:461)| |
> | - at
> org.apache.cassandra.utils.SyncUtil.force(Ljava/nio/channels/FileChannel;Z)V
> (SyncUtil.java:172)| |
> | - at org.apache.cassandra.io.util.SequentialWriter.syncDataOnlyInternal()V
> (SequentialWriter.java:190)| |
> | - at org.apache.cassandra.io.util.SequentialWriter.syncInternal()V
> (SequentialWriter.java:206)| |
> | - at
> org.apache.cassandra.io.compress.CompressedSequentialWriter.access$100(Lorg/apache/cassandra/io/compress/CompressedSequentialWriter;)V
> (CompressedSequentialWriter.java:39)| |
> | - at
> org.apache.cassandra.io.compress.CompressedSequentialWriter$TransactionalProxy.doPrepare()V
> (CompressedSequentialWriter.java:353)| |
> | - at
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit()V
> (Transactional.java:168)| |
> | - at org.apache.cassandra.io.util.SequentialWriter.prepareToCommit()V
> (SequentialWriter.java:379)| |
> | - at
> org.apache.cassandra.io.sstable.format.big.BigTableWriter$TransactionalProxy.doPrepare()V
> (BigTableWriter.java:409)| |
> | - at
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.prepareToCommit()V
> (Transactional.java:168)| |
> | - at
> org.apache.cassandra.utils.concurrent.Transactional$AbstractTransactional.finish()Ljava/lang/Object;
> (Transactional.java:179)| |
> | - at
> org.apache.cassandra.io.sstable.format.SSTableWriter.finish(Z)Lorg/apache/cassandra/io/sstable/format/SSTableReader;
> (SSTableWriter.java:266)| |
> | - at
> org.apache.cassandra.io.sstable.SimpleSSTableMultiWriter.finish(Z)Ljava/util/Collection;
> (SimpleSSTableMultiWriter.java:59)| |
> | - at
> org.apache.cassandra.io.sstable.format.RangeAwareSSTableWriter.finish(Z)Ljava/util/Collection;
> (RangeAwareSSTableWriter.java:135)| |
> | - at
> org.apache.cassandra.db.streaming.CassandraStreamReceiver.received(Lorg/apache/cassandra/streaming/IncomingStream;)V
> (CassandraStreamReceiver.java:108)| |
> | - at
> org.apache.cassandra.streaming.StreamReceiveTask.received(Lorg/apache/cassandra/streaming/IncomingStream;)V
> (StreamReceiveTask.java:91)| |
> | - at
> org.apache.cassandra.streaming.StreamSession.receive(Lorg/apache/cassandra/streaming/messages/IncomingStreamMessage;)V
> (StreamSession.java:848)| |
> | - at
> org.apache.cassandra.streaming.StreamSession.messageReceived(Lorg/apache/cassandra/streaming/messages/StreamMessage;)V
> (StreamSession.java:597)| |
> | - at
> org.apache.cassandra.streaming.async.StreamingInboundHandler$StreamDeserializingTask.run()V
> (StreamingInboundHandler.java:189)| |
> | - at io.netty.util.concurrent.FastThreadLocalRunnable.run()V
> (FastThreadLocalRunnable.java:30)| |
> | - at java.lang.Thread.run()V (Thread.java:834)| |
> '- Total: 23 entries | |
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> {code}
> Looking at the Java sources, the {{force0}} function calls {{fdatasync}}
> under Linux. Using {{perf trace record}} showed that some fdatasyncs were
> exceeding the socket user timeout threshold, explaining the failures.
> This issue required significant effort to determine the root cause, so at
> least it would be good to improve the ability to diagnose this for an
> operator that may not have access to system call profiling.
> Obviously {{fdatasync}} going away for 30s+ is a system tuning issue but I do
> not know of a way to guarantee an upper bound on fdatasync time, just make it
> more probable it completes.
> One workaround is to increase the TCP user timeout from 30s to whatever the
> host needs to complete, or to reset to the system default with {{0}}, however
> this impacts regular internode messaging as well as streaming, and it's
> desirable to discover dead nodes as early as possible.
> Possible improvements:
> * Separate the user timeout thresholds for internode messaging and streaming.
> * Create a metric for FileChannel.force times by unique filesystem to surface
> that as a possible timeout.
> * Introduce a log warning when FileChannel.force times exceed a threshold.
> * Run FileChannel.force on a separate (unbounded) excecutor service and
> either continue to stream while force completes in the background with at
> least some backpressure on the stream, or throw on the initiator to improve
> diagnosis.
> * Periodically call force by time and/or volume written on a background
> thread.
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