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https://issues.apache.org/jira/browse/FLINK-12381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16835591#comment-16835591
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Till Rohrmann commented on FLINK-12381:
---------------------------------------
But you said that you killed a cluster and restarted it. This makes it
effectively two cluster which are executed, just not concurrently. Since
killing a cluster can leave some checkpoint files behind, it could pretty much
explain what you are observing. The easiest way to verify this is to start the
job cluster with a different {{JobID}} via {{--job-id}}.
> 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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