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From Stefan Richter <s.rich...@data-artisans.com>
Subject Re: RocksDB segfaults
Date Wed, 22 Mar 2017 17:19:31 GMT
Hi,

for the first checkpoint, from the stacktrace I assume that the backend is not accessed as
part of processing an element, but by another thread. Is that correct? RocksDB requires accessing
threads to hold the task’s checkpointing lock, otherwise they might call methods on an instance
that is already disposed. However, this should only happen when the task was already about
to shutdown anyways. Is that a plausible explanation for your observed behaviour? I can also
not rule out that segfaults can happen inside RocksDB or due to the JNI bridge.

Best,
Stefan

> Am 22.03.2017 um 16:53 schrieb Florian König <florian.koenig@micardo.com>:
> 
> Hi Stephen,
> 
> you are right, the second stack trace is indeed from a run of Flink 1.1.4. Sorry, my
bad.
> 
> That leaves us with the first trace of a segfault for which I can guarantee that it brought
down a 1.2.0 instance. Unfortunately I cannot reproduce the problem. It has happened twice
so far, but I can’t see any pattern. Is there anything in the stack trace that could point
us to a probable cause?
> 
> Florian
> 
>> Am 22.03.2017 um 16:00 schrieb Stephan Ewen <sewen@apache.org>:
>> 
>> Hi!
>> 
>> It looks like you are running the RocksDB state backend 1.1 (is still an old version
packaged into your JAR file?)
>> 
>> This line indicates that: org.apache.flink.contrib.streaming.state.RocksDBStateBackend.performSemiAsyncSnapshot
(the method does not exist in 1.2 any more)
>> 
>> Can you try and run 1.2 and see if that still occurs? In general, I cannot vouch
100% for RocksDBs JNI API, but in our 1.2 tests so far it was stable.
>> 
>> Stephan
>> 
>> 
>> 
>> On Wed, Mar 22, 2017 at 3:13 PM, Florian König <florian.koenig@micardo.com>
wrote:
>> Hi,
>> 
>> I have experienced two crashes of Flink 1.2 by SIGSEGV, caused by something in RocksDB.
What is the preferred way to report them? All I got at the moment are two hs_err_pid12345.log
files. They are over 4000 lines long each. Is there anything significant that I should extract
to help you guys and/or put into a JIRA ticket?
>> 
>> The first thing that came to my mind was the stack traces (see below). Anything else?
>> 
>> Thanks
>> Florian
>> 
>> ----
>> 
>> Stack: [0x00007fec04341000,0x00007fec04442000],  sp=0x00007fec0443ff48,  free space=1019k
>> Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
>> J 10252  org.rocksdb.RocksDB.get(J[BIJ)[B (0 bytes) @ 0x00007fec925887cc [0x00007fec92588780+0x4c]
>> J 27241 C2 org.apache.flink.contrib.streaming.state.RocksDBValueState.value()Ljava/lang/Object;
(78 bytes) @ 0x00007fec94010ca4 [0x00007fec940109c0+0x2e4]
>> j  com.micardo.backend.TransitionProcessor$2.getValue()Ljava/lang/Long;+7
>> j  com.micardo.backend.TransitionProcessor$2.getValue()Ljava/lang/Object;+1
>> J 38483 C2 org.apache.flink.runtime.metrics.dump.MetricDumpSerialization.serializeGauge(Ljava/io/DataOutput;Lorg/apache/flink/runtime/metrics/dump/QueryScopeInfo;Ljava/lang/String;Lorg/apache/flink/metrics/Gauge;)V
(114 bytes) @ 0x00007fec918eabf0 [0x00007fec918eabc0+0x30]
>> J 38522 C2 org.apache.flink.runtime.metrics.dump.MetricDumpSerialization$MetricDumpSerializer.serialize(Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;)Lorg/apache/flink/runtime/metrics/dump/MetricDumpSerialization$MetricSerializationResult;
(471 bytes) @ 0x00007fec94eb6260 [0x00007fec94eb57a0+0xac0]
>> J 47531 C2 org.apache.flink.runtime.metrics.dump.MetricQueryService.onReceive(Ljava/lang/Object;)V
(453 bytes) @ 0x00007fec95ca57a0 [0x00007fec95ca4da0+0xa00]
>> J 5815 C2 akka.actor.UntypedActor.aroundReceive(Lscala/PartialFunction;Ljava/lang/Object;)V
(7 bytes) @ 0x00007fec91e3ae6c [0x00007fec91e3adc0+0xac]
>> J 5410 C2 akka.actor.ActorCell.invoke(Lakka/dispatch/Envelope;)V (104 bytes) @ 0x00007fec91d5bc44
[0x00007fec91d5b9a0+0x2a4]
>> J 6628 C2 scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(Lscala/concurrent/forkjoin/ForkJoinTask;)V
(60 bytes) @ 0x00007fec9212d050 [0x00007fec9212ccc0+0x390]
>> J 40130 C2 scala.concurrent.forkjoin.ForkJoinWorkerThread.run()V (182 bytes) @ 0x00007fec923f8170
[0x00007fec923f7fc0+0x1b0]
>> v  ~StubRoutines::call_stub
>> 
>> --------------------------------------
>> 
>> Stack: [0x00007f167a5b7000,0x00007f167a6b8000],  sp=0x00007f167a6b5f40,  free space=1019k
>> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
>> C  [libstdc++.so.6+0xc026b]  std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string(std::string const&)+0xb
>> C  [librocksdbjni8426686507832168508.so+0x2f14ca]  rocksdb::BackupEngine::Open(rocksdb::Env*,
rocksdb::BackupableDBOptions const&, rocksdb::BackupEngine**)+0x3a
>> C  [librocksdbjni8426686507832168508.so+0x180ad5]  Java_org_rocksdb_BackupEngine_open+0x25
>> J 50030  org.rocksdb.BackupEngine.open(JJ)J (0 bytes) @ 0x00007f16cb79aa36 [0x00007f16cb79a980+0xb6]
>> J 49809 C1 org.apache.flink.contrib.streaming.state.RocksDBStateBackend.performSemiAsyncSnapshot(JJ)Ljava/util/HashMap;
(416 bytes) @ 0x00007f16cd2733d4 [0x00007f16cd2719a0+0x1a34]
>> J 51766 C2 org.apache.flink.contrib.streaming.state.RocksDBStateBackend.snapshotPartitionedState(JJ)Ljava/util/HashMap;
(40 bytes) @ 0x00007f16cb40a1fc [0x00007f16cb40a1a0+0x5c]
>> J 50547 C2 org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotOperatorState(JJ)Lorg/apache/flink/streaming/runtime/tasks/StreamTaskState;
(206 bytes) @ 0x00007f16cb8be89c [0x00007f16cb8be7e0+0xbc]
>> J 52232 C2 org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(JJ)Z
(650 bytes) @ 0x00007f16cbfbbf60 [0x00007f16cbfbb540+0xa20]
>> J 52419 C2 org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(Lorg/apache/flink/runtime/io/network/api/CheckpointBarrier;)V
(25 bytes) @ 0x00007f16cbdd2624 [0x00007f16cbdd25c0+0x64]
>> J 41649 C2 org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(Lorg/apache/flink/streaming/api/operators/OneInputStreamOperator;Ljava/lang/Object;)Z
(439 bytes) @ 0x00007f16cc8aed5c [0x00007f16cc8add40+0x101c]
>> J 33374% C2 org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run()V (42
bytes) @ 0x00007f16cbdc21d0 [0x00007f16cbdc20c0+0x110]
>> j  org.apache.flink.streaming.runtime.tasks.StreamTask.invoke()V+301
>> j  org.apache.flink.runtime.taskmanager.Task.run()V+700
>> j  java.lang.Thread.run()V+11
>> v  ~StubRoutines::call_stub
>> V  [libjvm.so+0x68c616]
>> V  [libjvm.so+0x68cb21]
>> V  [libjvm.so+0x68cfc7]
>> V  [libjvm.so+0x723d80]
>> V  [libjvm.so+0xa69dcf]
>> V  [libjvm.so+0xa69efc]
>> V  [libjvm.so+0x91d9d8]
>> C  [libpthread.so.0+0x8064]  start_thread+0xc4
>> 
>> Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
>> J 50030  org.rocksdb.BackupEngine.open(JJ)J (0 bytes) @ 0x00007f16cb79a9c4 [0x00007f16cb79a980+0x44]
>> J 49809 C1 org.apache.flink.contrib.streaming.state.RocksDBStateBackend.performSemiAsyncSnapshot(JJ)Ljava/util/HashMap;
(416 bytes) @ 0x00007f16cd2733d4 [0x00007f16cd2719a0+0x1a34]
>> J 51766 C2 org.apache.flink.contrib.streaming.state.RocksDBStateBackend.snapshotPartitionedState(JJ)Ljava/util/HashMap;
(40 bytes) @ 0x00007f16cb40a1fc [0x00007f16cb40a1a0+0x5c]
>> J 50547 C2 org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotOperatorState(JJ)Lorg/apache/flink/streaming/runtime/tasks/StreamTaskState;
(206 bytes) @ 0x00007f16cb8be89c [0x00007f16cb8be7e0+0xbc]
>> J 52232 C2 org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(JJ)Z
(650 bytes) @ 0x00007f16cbfbbf60 [0x00007f16cbfbb540+0xa20]
>> J 52419 C2 org.apache.flink.streaming.runtime.io.BarrierBuffer.notifyCheckpoint(Lorg/apache/flink/runtime/io/network/api/CheckpointBarrier;)V
(25 bytes) @ 0x00007f16cbdd2624 [0x00007f16cbdd25c0+0x64]
>> J 41649 C2 org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(Lorg/apache/flink/streaming/api/operators/OneInputStreamOperator;Ljava/lang/Object;)Z
(439 bytes) @ 0x00007f16cc8aed5c [0x00007f16cc8add40+0x101c]
>> J 33374% C2 org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run()V (42
bytes) @ 0x00007f16cbdc21d0 [0x00007f16cbdc20c0+0x110]
>> j  org.apache.flink.streaming.runtime.tasks.StreamTask.invoke()V+301
>> j  org.apache.flink.runtime.taskmanager.Task.run()V+700
>> j  java.lang.Thread.run()V+11
>> v  ~StubRoutines::call_stub
>> 
>> 
>> 
>> 
> 
> 


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