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https://issues.apache.org/jira/browse/FLINK-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516443#comment-15516443
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ASF GitHub Bot commented on FLINK-4218:
---------------------------------------
GitHub user StephanEwen opened a pull request:
https://github.com/apache/flink/pull/2544
[FLINK-4218] [checkpoints] Do not rely on FileSystem to determine state
sizes
This prevents failures on eventually consistent S3, where the operations
for keys (=entries in the parent directory/bucket) are not guaranteed to be
immediately consistent (visible) after a blob was written.
Not relying on any operation on keys (= requesting `FileStatus`) should
mitigate the problem.
This also changes the exception signature from `getStateSize()` from
`Exception` to `IOException`, which fits more natural with the exception
signatures of some other I/O methods.
Related issue: We may still want to have retries on `FileStatus` operations
on S3, for other parts of the system (like FileOutputFormats)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/StephanEwen/incubator-flink state_size_fix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2544.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2544
----
commit 7ce2de7e14b9a1fb24c27dc674f689f08abdf7cc
Author: Stephan Ewen <[email protected]>
Date: 2016-09-23T13:16:27Z
[FLINK-4218] [checkpoints] Do not rely on FileSystem to determing state
sizes
This prevents failures on eventually consistent S3, where the operations for
keys (=entries in the parent directory/bucket) are not guaranteed to be
immediately
consistent (visible) after a blob was written.
----
> 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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