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From Ziyad Muhammed <mmzi...@gmail.com>
Subject Re: Unable to use Flink RocksDB state backend due to endianness mismatch
Date Thu, 15 Jun 2017 16:23:50 GMT
Hi Stefan

I could solve the issue by building frocksdb with a patch for ppc
architecture. How ever this patch is already applied to the latest version
of rocksdb, where as frocksdb seems not updated in a while. It would be
nice to have it updated with this patch.


On Tue, Jun 6, 2017 at 10:01 AM, Stefan Richter <s.richter@data-artisans.com
> wrote:

> Hi,
> RocksDB is a native library with JNI binding. It is included as a
> dependency and does not build from source when you build Flink. The
> included jar provides native code for Linux, OSX, and Windows on x86-64.
> From the Exception, I would conclude you are using a different CPU
> architecture that is big endian. In this case, you would have to compile
> RocksDB yourself on your native platform and replace the jar that ships
> with Flink.
> Best,
> Stefan
> Am 03.06.2017 um 14:16 schrieb Ziyad Muhammed <mmziyad@gmail.com>:
> Dear all,
> My Flink Job reads from a kafka topic and store the data in a RocksDB
> state backend, in order to make use of the queryable state. I'm able to run
> the job and query the state in my local machine. But when deploying on the
> cluster, I'm getting the below error:
> Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
> at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply$mcV$sp(JobManager.scala:900)
> at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:843)
> at org.apache.flink.runtime.jobmanager.JobManager$$anonfun$handleMessage$1$$anonfun$applyOrElse$6.apply(JobManager.scala:843)
> at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
> at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
> at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
> at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)
> at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
> at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
> at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
> Caused by: java.lang.IllegalStateException: Could not initialize keyed state backend.
> at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initKeyedState(AbstractStreamOperator.java:286)
> at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:199)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:666)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:654)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:257)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.Exception: Could not load the native RocksDB library
> at org.apache.flink.contrib.streaming.state.RocksDBStateBackend.ensureRocksDBIsLoaded(RocksDBStateBackend.java:483)
> at org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:235)
> at org.apache.flink.streaming.runtime.tasks.StreamTask.createKeyedStateBackend(StreamTask.java:785)
> at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initKeyedState(AbstractStreamOperator.java:277)
> ... 6 more
> Caused by: java.lang.UnsatisfiedLinkError: /data/hadoop/tmp/rocksdb-lib-32bc6a5551b331596649309a808b287d/librocksdbjni-linux64.so:
/data/hadoop/tmp/rocksdb-lib-32bc6a5551b331596649309a808b287d/librocksdbjni-linux64.so: ELF
file data encoding not big-endian (Possible cause: endianness mismatch)
> at java.lang.ClassLoader$NativeLibrary.load(Native Method)
> at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
> at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
> at java.lang.Runtime.load0(Runtime.java:809)
> at java.lang.System.load(System.java:1086)
> at org.rocksdb.NativeLibraryLoader.loadLibraryFromJar(NativeLibraryLoader.java:78)
> at org.rocksdb.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:56)
> at org.apache.flink.contrib.streaming.state.RocksDBStateBackend.ensureRocksDBIsLoaded(RocksDBStateBackend.java:460)
> I have tried setting the rocksDB state backend at cluster level and job
> level. when it is set at job level, I have provided it as a shaded
> dependency. I have tried compiling the code on the host cluster machine as
> well. I get the same error in all the cases.
> ELF file data encoding not big-endian (Possible cause: endianness mismatch)
> How can I solve this error?
> Thanks in advance
> Ziyad

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