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https://issues.apache.org/jira/browse/FLINK-4228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16256656#comment-16256656
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ASF GitHub Bot commented on FLINK-4228:
---------------------------------------
Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4939
I'm actually with Chesnay on the part of using exclusions (and letting AWS
pull them in with the right version) rather than adding explicit dependencies
because it will be easier to debug than an error due to a version conflict.
We can immediately spot those `ClassNotFoundException` instances in the
failing unit tests (recall that those dependencies are all in `test` scope!)
while as a version conflict may show up more subtle and be less easy to spot.
> YARN artifact upload does not work with S3AFileSystem
> -----------------------------------------------------
>
> Key: FLINK-4228
> URL: https://issues.apache.org/jira/browse/FLINK-4228
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Reporter: Ufuk Celebi
> Assignee: Nico Kruber
> Priority: Blocker
> Fix For: 1.4.0
>
>
> The issue now is exclusive to running on YARN with s3a:// as your configured
> FileSystem. If so, the Flink session will fail on staging itself because it
> tries to copy the flink/lib directory to S3 and the S3aFileSystem does not
> support recursive copy.
> h2. Old Issue
> Using the {{RocksDBStateBackend}} with semi-async snapshots (current default)
> leads to an Exception when uploading the snapshot to S3 when using the
> {{S3AFileSystem}}.
> {code}
> AsynchronousException{com.amazonaws.AmazonClientException: Unable to
> calculate MD5 hash:
> /var/folders/_c/5tc5q5q55qjcjtqwlwvwd1m00000gn/T/flink-io-5640e9f1-3ea4-4a0f-b4d9-3ce9fbd98d8a/7c6e745df2dddc6eb70def1240779e44/StreamFlatMap_3_0/dummy_state/47daaf2a-150c-4208-aa4b-409927e9e5b7/local-chk-2886
> (Is a directory)}
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask$AsyncCheckpointThread.run(StreamTask.java:870)
> Caused by: com.amazonaws.AmazonClientException: Unable to calculate MD5 hash:
> /var/folders/_c/5tc5q5q55qjcjtqwlwvwd1m00000gn/T/flink-io-5640e9f1-3ea4-4a0f-b4d9-3ce9fbd98d8a/7c6e745df2dddc6eb70def1240779e44/StreamFlatMap_3_0/dummy_state/47daaf2a-150c-4208-aa4b-409927e9e5b7/local-chk-2886
> (Is a directory)
> at
> com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1298)
> at
> com.amazonaws.services.s3.transfer.internal.UploadCallable.uploadInOneChunk(UploadCallable.java:108)
> at
> com.amazonaws.services.s3.transfer.internal.UploadCallable.call(UploadCallable.java:100)
> at
> com.amazonaws.services.s3.transfer.internal.UploadMonitor.upload(UploadMonitor.java:192)
> at
> com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:150)
> at
> com.amazonaws.services.s3.transfer.internal.UploadMonitor.call(UploadMonitor.java:50)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.FileNotFoundException:
> /var/folders/_c/5tc5q5q55qjcjtqwlwvwd1m00000gn/T/flink-io-5640e9f1-3ea4-4a0f-b4d9-3ce9fbd98d8a/7c6e745df2dddc6eb70def1240779e44/StreamFlatMap_3_0/dummy_state/47daaf2a-150c-4208-aa4b-409927e9e5b7/local-chk-2886
> (Is a directory)
> at java.io.FileInputStream.open0(Native Method)
> at java.io.FileInputStream.open(FileInputStream.java:195)
> at java.io.FileInputStream.<init>(FileInputStream.java:138)
> at
> com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1294)
> ... 9 more
> {code}
> Running with S3NFileSystem, the error does not occur. The problem might be
> due to {{HDFSCopyToLocal}} assuming that sub-folders are going to be created
> automatically. We might need to manually create folders and copy only actual
> files for {{S3AFileSystem}}. More investigation is required.
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