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https://issues.apache.org/jira/browse/FLINK-3431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shuyi Chen reassigned FLINK-3431:
---------------------------------
Assignee: Shuyi Chen
> Add retrying logic for RocksDB snapshots
> ----------------------------------------
>
> Key: FLINK-3431
> URL: https://issues.apache.org/jira/browse/FLINK-3431
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API, State Backends, Checkpointing
> Reporter: Gyula Fora
> Assignee: Shuyi Chen
> Priority: Critical
>
> Currently the RocksDB snapshots rely on hdfs copy not failing while taking
> the snapshots.
> In some cases when the state size is big enough the HDFS nodes might get so
> overloaded that the copy operation fails on errors like this:
> AsynchronousException{java.io.IOException: All datanodes 172.26.86.90:50010
> are bad. Aborting...}
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$1.run(StreamTask.java:545)
> Caused by: java.io.IOException: All datanodes 172.26.86.90:50010 are bad.
> Aborting...
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1023)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:838)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:483)
> I think it would be important that we don't immediately fail the job in these
> cases but retry the copy operation after some random sleep time. It might be
> also good to do a random sleep before the copy depending on the state size to
> smoothen out IO a little bit.
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