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https://issues.apache.org/jira/browse/SPARK-19013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799931#comment-15799931
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Shixiong Zhu commented on SPARK-19013:
--------------------------------------

Thanks, [~zzztimbo] That must be caused by the negative cache.

[~steve_l] FYI, HDFSMetadataLog uses this pattern in this code path: "check if 
a file exists" (done by the `create` method with "overwrite=false") -> "create 
a file" -> "check if a file exists again" (done by "rename")

> java.util.ConcurrentModificationException when using s3 path as 
> checkpointLocation 
> -----------------------------------------------------------------------------------
>
>                 Key: SPARK-19013
>                 URL: https://issues.apache.org/jira/browse/SPARK-19013
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.0.2
>            Reporter: Tim Chan
>
> I have a structured stream job running on EMR. The job will fail due to this
> {code}
> Multiple HDFSMetadataLog are using s3://mybucket/myapp 
> org.apache.spark.sql.execution.streaming.HDFSMetadataLog.org$apache$spark$sql$execution$streaming$HDFSMetadataLog$$writeBatch(HDFSMetadataLog.scala:162)
> {code}
> There is only one instance of this stream job running.



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