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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (FLINK-12381) W/o HA, upon a full restart, checkpointing crashes
Date Wed, 08 May 2019 07:01:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-12381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16835360#comment-16835360
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Stephan Ewen edited comment on FLINK-12381 at 5/8/19 7:00 AM:
--------------------------------------------------------------

Flink does not overwrite checkpoints, because this could lead to one job causing another job
data loss.

Paths between jobs should be different due to different JobIDs.- Can you share your setup,
specifically why your job ID is all zero?-
Edit: I assume this is a job cluster (container mode)?


was (Author: stephanewen):
Flink does not overwrite checkpoints, because this could lead to one job causing another job
data loss.

Paths between jobs should be different due to different JobIDs. Can you share your setup,
specifically why your job ID is all zero?

> W/o HA, upon a full restart, checkpointing crashes
> --------------------------------------------------
>
>                 Key: FLINK-12381
>                 URL: https://issues.apache.org/jira/browse/FLINK-12381
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Checkpointing, Runtime / Coordination
>    Affects Versions: 1.8.0
>         Environment: Same as FLINK-\{12379, 12377, 12376}
>            Reporter: Henrik
>            Priority: Major
>
> {code:java}
> Caused by: org.apache.hadoop.fs.FileAlreadyExistsException: 'gs://example_bucket/flink/checkpoints/00000000000000000000000000000000/chk-16/_metadata'
already exists
>     at com.google.cloud.hadoop.fs.gcs.GoogleHadoopOutputStream.createChannel(GoogleHadoopOutputStream.java:85)
>     at com.google.cloud.hadoop.fs.gcs.GoogleHadoopOutputStream.<init>(GoogleHadoopOutputStream.java:74)
>     at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase.create(GoogleHadoopFileSystemBase.java:797)
>     at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:929)
>     at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:910)
>     at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:807)
>     at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.create(HadoopFileSystem.java:141)
>     at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.create(HadoopFileSystem.java:37)
>     at org.apache.flink.runtime.state.filesystem.FsCheckpointMetadataOutputStream.<init>(FsCheckpointMetadataOutputStream.java:65)
>     at org.apache.flink.runtime.state.filesystem.FsCheckpointStorageLocation.createMetadataOutputStream(FsCheckpointStorageLocation.java:104)
>     at org.apache.flink.runtime.checkpoint.PendingCheckpoint.finalizeCheckpoint(PendingCheckpoint.java:259)
>     at org.apache.flink.runtime.checkpoint.CheckpointCoordinator.completePendingCheckpoint(CheckpointCoordinator.java:829)
>     ... 8 more
> {code}
> Instead, it should either just overwrite the checkpoint or fail to start the job completely.
Partial and undefined failure is not what should happen.
>  
> Repro:
>  # Set up a single purpose job cluster (which could use much better docs btw!)
>  # Let it run with GCS checkpointing for a while with rocksdb/gs://example
>  # Kill it
>  # Start it



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