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From Allen Wang <aw...@netflix.com.INVALID>
Subject Re: Leadership rebalance causing drop of incoming messages
Date Wed, 21 Jan 2015 19:03:40 GMT
After a closer look to other metrics and broker logs, we found that the
instability of the broker cluster might have been caused by a snappy
un-compression error. In our case, the consumer and producer happens to be
the same application so restarting the client made the recovery of the
broker cluster. Here is the error we saw in the broker log:

  2015-01-19 00:07:24,891 ERROR kafka.utils.Logging$class:103
[kafka-request-handler-0] [error] [KafkaApi-7] Error processing
ProducerRequest with correlation id 393323 from client surorouter-mantis on
partition [logblob-networkerror,0]

kafka.common.KafkaException: Error in validating messages while appending
to log 'logblob-networkerror-0'

at kafka.log.Log.liftedTree1$1(Log.scala:254)

at kafka.log.Log.append(Log.scala:251)

at kafka.cluster.Partition.appendMessagesToLeader(Partition.scala:354)

at
kafka.server.KafkaApis$$anonfun$appendToLocalLog$2.apply(KafkaApis.scala:376)

at
kafka.server.KafkaApis$$anonfun$appendToLocalLog$2.apply(KafkaApis.scala:366)

at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)

at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)

at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:95)

at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:95)

at scala.collection.Iterator$class.foreach(Iterator.scala:772)

at scala.collection.mutable.HashTable$$anon$1.foreach(HashTable.scala:157)

at
scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:190)

at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:45)

at scala.collection.mutable.HashMap.foreach(HashMap.scala:95)

at scala.collection.TraversableLike$class.map(TraversableLike.scala:233)

at scala.collection.mutable.HashMap.map(HashMap.scala:45)

at kafka.server.KafkaApis.appendToLocalLog(KafkaApis.scala:366)

at kafka.server.KafkaApis.handleProducerRequest(KafkaApis.scala:292)

at kafka.server.KafkaApis.handle(KafkaApis.scala:185)

at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:42)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.io.IOException: failed to uncompress the chunk:
FAILED_TO_UNCOMPRESS(5)

at
org.xerial.snappy.SnappyInputStream.hasNextChunk(SnappyInputStream.java:362)

at org.xerial.snappy.SnappyInputStream.rawRead(SnappyInputStream.java:159)

at org.xerial.snappy.SnappyInputStream.read(SnappyInputStream.java:142)

at java.io.InputStream.read(InputStream.java:101)

at
kafka.message.ByteBufferMessageSet$$anonfun$decompress$1.apply$mcI$sp(ByteBufferMessageSet.scala:68)

at
kafka.message.ByteBufferMessageSet$$anonfun$decompress$1.apply(ByteBufferMessageSet.scala:68)

at
kafka.message.ByteBufferMessageSet$$anonfun$decompress$1.apply(ByteBufferMessageSet.scala:68)

at scala.collection.immutable.Stream$.continually(Stream.scala:1104)

at
scala.collection.immutable.Stream$$anonfun$continually$1.apply(Stream.scala:1104)

at
scala.collection.immutable.Stream$$anonfun$continually$1.apply(Stream.scala:1104)

at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1060)

at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1052)

at
scala.collection.immutable.Stream$$anonfun$takeWhile$1.apply(Stream.scala:782)

at
scala.collection.immutable.Stream$$anonfun$takeWhile$1.apply(Stream.scala:782)

at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1060)

at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1052)

at scala.collection.immutable.Stream.foreach(Stream.scala:527)

The un-compression error is likely to be caused by incompatible snappy
version used by the producer.

Also, it appears that when the metric FailedProduceRequestsPerSec (which
captures the above error) raises to a certain level (around 20/s), it will
start to have impact on the stability of the brokers, including significant
increase of GC time.

How does Kafka handle such un-compression errors? Is it possible that the
ByteBuffer from the compressed messages are not released quick enough when
such errors happen at high rate?




On Thu, Jan 15, 2015 at 5:51 PM, Joel Koshy <jjkoshy.w@gmail.com> wrote:

> Not sure what could be going on..
>
> What version of the client and the broker are you on?
>
> Can you verify from the state change logs the time it took for
> leadership to move to the preferred leader?
>
> Were there long GCs in your brokers?  Can you also look for zookeeper
> session expirations in your broker logs?
>
> It is odd that restarting your consumers appears to have resolved your
> issues. What config overrides did you use for your consumers? E.g.,
> did you override the max wait time?
>
> How many consumers/producers are we talking about here?
>
> Thanks,
>
> Joel
>
> On Thu, Jan 15, 2015 at 11:55:35AM -0800, Allen Wang wrote:
> > We are using the scala producer. From producer side, we have seen a lot
> of
> > error messages in producer during the time of incoming message drop:
> >
> > Produce request with correlation id 31616255 failed due to
> > [trace_annotation,10]: kafka.common.NotLeaderForPartitionException
> >
> > And a few (far less than the NotLeaderForPartitionException) of those:
> >
> > 2015-01-15 17:57:54,412 WARN KafkaSink-kafka_0_8_logtrace_asg-Sender-2
> > DefaultEventHandler - Failed to send producer request with correlation id
> > 31554484 to broker 20 with
> > data for partitions [trace_annotation,9]
> > java.net.SocketTimeoutException
> >
> > What's interesting is that the broker cluster recovered from the message
> > drop only after we restarted consumers. Also during that time, we have
> > observed is that the garbage collection time for the brokers increased 5
> > times. The AllBrokersFetchRequestRateAndTimeMs_9X metric from the
> consumer
> > side also increased from a few hundred ms to several seconds.
> >
> > What we don't know is whether the garbage collection time increase is the
> > cause or the effect of the problem. It seems that after the rebalance,
> some
> > resources in the brokers was tied up and it was only released after
> restart
> > of consumers.
> >
> >
> > On Thu, Jan 15, 2015 at 8:15 AM, Joel Koshy <jjkoshy.w@gmail.com> wrote:
> >
> > > > Is leadership rebalance a safe operation?
> > >
> > > Yes - we use it routinely. For any partition, there should only be a
> > > brief (order of seconds) period of rejected messages as leaders move.
> > > When that happens the client should refresh metadata and discover the
> > > new leader. Are you using the Java producer? Do you see any errors in
> > > the producer logs?
> > >
> > > On Wed, Jan 14, 2015 at 06:36:27PM -0800, Allen Wang wrote:
> > > > Hello,
> > > >
> > > > We did a manual leadership rebalance (using
> > > > PreferredReplicaLeaderElectionCommand) under heavy load and found
> that
> > > > there is a significant drop of incoming messages to the broker
> cluster
> > > for
> > > > more than an hour. Looking at broker log, we found a lot of errors
> like
> > > > this:
> > > >
> > > > 2015-01-15 00:00:03,330 ERROR kafka.utils.Logging$class:103
> > > > [kafka-processor-7101-0] [error] Closing socket for /10.213.156.41
> > > > because of error
> > > > java.io.IOException: Connection reset by peer
> > > >       at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
> > > >       at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
> > > >       at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
> > > >       at sun.nio.ch.IOUtil.read(IOUtil.java:197)
> > > >       at
> sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)
> > > >       at kafka.utils.Utils$.read(Utils.scala:375)
> > > >       at
> > >
> kafka.network.BoundedByteBufferReceive.readFrom(BoundedByteBufferReceive.scala:54)
> > > >       at kafka.network.Processor.read(SocketServer.scala:347)
> > > >       at kafka.network.Processor.run(SocketServer.scala:245)
> > > >       at java.lang.Thread.run(Thread.java:745)
> > > >
> > > >
> > > > Is leadership rebalance a safe operation?
> > > >
> > > > Thanks.
> > >
> > >
>
>

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