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https://issues.apache.org/jira/browse/SPARK-29469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-29469.
---------------------------------
Fix Version/s: 3.0.0
Resolution: Fixed
> Avoid retries by RetryingBlockFetcher when ExternalBlockStoreClient is closed
> -----------------------------------------------------------------------------
>
> Key: SPARK-29469
> URL: https://issues.apache.org/jira/browse/SPARK-29469
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Affects Versions: 3.0.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Minor
> Fix For: 3.0.0
>
>
> Found that some NPE was thrown in job log:
> 2019-10-14 20:06:16 ERROR RetryingBlockFetcher:143 - Exception while
> beginning fetch of 2 outstanding blocks (after 3 retries)
> java.lang.NullPointerException
> at
> org.apache.spark.network.shuffle.ExternalShuffleClient.lambda$fetchBlocks$0(ExternalShuffleClient.java:100)
> at
> org.apache.spark.network.shuffle.RetryingBlockFetcher.fetchAllOutstanding(RetryingBlockFetcher.java:141)
> at
> org.apache.spark.network.shuffle.RetryingBlockFetcher.lambda$initiateRetry$0(RetryingBlockFetcher.java:169)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
> It was happened after BlockManager and ExternalBlockStoreClient was closed
> due to previous errors. In this cases, RetryingBlockFetcher does not need to
> retry. This NPE is harmless for job execution, but is a source of misleading
> when looking at log. Especially for end-users.
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