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From "Sergii Koshel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4218) Sporadic "java.lang.RuntimeException: Error triggering a checkpoint..." causes task restarting
Date Fri, 15 Jul 2016 08:18:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15379007#comment-15379007
] 

Sergii Koshel commented on FLINK-4218:
--------------------------------------

AWS promised to have *read-after-write* consistency for S3 objects (http://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html#Regions).

So it shouldn't be possible to get *java.io.FileNotFoundException* from any node if write
was successfully handled.

As far as I know *S3AFileSystem* uses buffer dir to upload data to S3. 
Would be good to make sure that file is actually uploaded to S3 before acknowledge the checkpoint.

> Sporadic "java.lang.RuntimeException: Error triggering a checkpoint..." causes task restarting
> ----------------------------------------------------------------------------------------------
>
>                 Key: FLINK-4218
>                 URL: https://issues.apache.org/jira/browse/FLINK-4218
>             Project: Flink
>          Issue Type: Improvement
>    Affects Versions: 1.1.0
>            Reporter: Sergii Koshel
>
> Sporadically see exception as below. And restart of task because of it.
> {code:title=Exception|borderStyle=solid}
> java.lang.RuntimeException: Error triggering a checkpoint as the result of receiving
checkpoint barrier
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask$3.onEvent(StreamTask.java:785)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask$3.onEvent(StreamTask.java:775)
> 	at org.apache.flink.streaming.runtime.io.BarrierBuffer.processBarrier(BarrierBuffer.java:203)
> 	at org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:129)
> 	at org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:183)
> 	at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:66)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:265)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:588)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.FileNotFoundException: No such file or directory: s3://<bucket_name_here>/flink/checkpoints/ece317c26960464ba5de75f3bbc38cb2/chk-8810/96eebbeb-de14-45c7-8ebb-e7cde978d6d3
> 	at org.apache.hadoop.fs.s3a.S3AFileSystem.getFileStatus(S3AFileSystem.java:996)
> 	at org.apache.hadoop.fs.s3a.S3AFileSystem.getFileStatus(S3AFileSystem.java:77)
> 	at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.getFileStatus(HadoopFileSystem.java:351)
> 	at org.apache.flink.runtime.state.filesystem.AbstractFileStateHandle.getFileSize(AbstractFileStateHandle.java:93)
> 	at org.apache.flink.runtime.state.filesystem.FileStreamStateHandle.getStateSize(FileStreamStateHandle.java:58)
> 	at org.apache.flink.runtime.state.AbstractStateBackend$DataInputViewHandle.getStateSize(AbstractStateBackend.java:482)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTaskStateList.getStateSize(StreamTaskStateList.java:77)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:604)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask$3.onEvent(StreamTask.java:779)
> 	... 8 more
> {code}
> File actually exists on S3. 
> I suppose it is related to some race conditions with S3 but would be good to retry a
few times before stop task execution.



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