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https://issues.apache.org/jira/browse/FLINK-20192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233621#comment-17233621
]
Congxian Qiu commented on FLINK-20192:
--------------------------------------
[~Antti-Kaikkonen] Incremental checkpoints may reference the files belongs to
the previous jobs.
If you want to delete the files in the {{SHARED}} directory safely, you need to
go through all the checkpoint metadata to find out whether the file is still
been referenced
> Externalized checkpoint references a checkpoint from a different job
> --------------------------------------------------------------------
>
> Key: FLINK-20192
> URL: https://issues.apache.org/jira/browse/FLINK-20192
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream, Runtime / Checkpointing
> Affects Versions: 1.11.2
> Reporter: Antti Kaikkonen
> Priority: Major
> Attachments: _metadata
>
>
> When I try to restore from an externalized checkpoint located at:
> +/home/anttkaik/flink/checkpoints/0fc94de8d94e123585b5baed6972dbe8/chk-12+ I
> get the following error:
>
> {code:java}
> java.lang.Exception: Exception while creating StreamOperatorStateContext.
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:204)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:247)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:290)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$0(StreamTask.java:479)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:475)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:528)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721) at
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:546) at
> java.lang.Thread.run(Thread.java:748) Caused by:
> org.apache.flink.util.FlinkException: Could not restore keyed state backend
> for FunctionGroupOperator_6b87a4870d0e21cecbbe271bd893cfcc_(2/4) from any of
> the 1 provided restore options. at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:317)
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:144)
> ... 9 more Caused by:
> org.apache.flink.runtime.state.BackendBuildingException: Caught unexpected
> exception. at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:329)
> at
> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:535)
> at
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:301)
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
> at
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
> ... 11 more Caused by: java.io.FileNotFoundException:
> /home/anttkaik/flink/checkpoints/01dbaf21d7c5e8f8eabd3602e086bb89/shared/0a3c0c1d-c924-4e6d-b6ad-463a75c9fce8
> (No such file or directory) at java.io.FileInputStream.open0(Native
> Method) at java.io.FileInputStream.open(FileInputStream.java:195) at
> java.io.FileInputStream.<init>(FileInputStream.java:138) at
> org.apache.flink.core.fs.local.LocalDataInputStream.<init>(LocalDataInputStream.java:50)
> at
> org.apache.flink.core.fs.local.LocalFileSystem.open(LocalFileSystem.java:143)
> at
> org.apache.flink.core.fs.SafetyNetWrapperFileSystem.open(SafetyNetWrapperFileSystem.java:85)
> at
> org.apache.flink.runtime.state.filesystem.FileStateHandle.openInputStream(FileStateHandle.java:69)
> at
> org.apache.flink.contrib.streaming.state.RocksDBStateDownloader.downloadDataForStateHandle(RocksDBStateDownloader.java:126)
> at
> org.apache.flink.contrib.streaming.state.RocksDBStateDownloader.lambda$createDownloadRunnables$0(RocksDBStateDownloader.java:109)
> at
> org.apache.flink.util.function.ThrowingRunnable.lambda$unchecked$0(ThrowingRunnable.java:50)
> at
> java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640)
> at
> org.apache.flink.runtime.concurrent.DirectExecutorService.execute(DirectExecutorService.java:211)
> at
> java.util.concurrent.CompletableFuture.asyncRunStage(CompletableFuture.java:1654)
> at
> java.util.concurrent.CompletableFuture.runAsync(CompletableFuture.java:1871)
> at
> org.apache.flink.contrib.streaming.state.RocksDBStateDownloader.downloadDataForAllStateHandles(RocksDBStateDownloader.java:83)
> at
> org.apache.flink.contrib.streaming.state.RocksDBStateDownloader.transferAllStateDataToDirectory(RocksDBStateDownloader.java:66)
> at
> org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.transferRemoteStateToLocalDirectory(RocksDBIncrementalRestoreOperation.java:230)
> at
> org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreFromRemoteState(RocksDBIncrementalRestoreOperation.java:195)
> at
> org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.initDBWithRescaling(RocksDBIncrementalRestoreOperation.java:342)
> at
> org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreWithRescaling(RocksDBIncrementalRestoreOperation.java:276)
> at
> org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restore(RocksDBIncrementalRestoreOperation.java:153)
> at
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:270)
> ... 15 more{code}
> The job +0fc94de8d94e123585b5baed6972dbe8+ was restored from an externalized
> checkpoint generated by +01dbaf21d7c5e8f8eabd3602e086bb89+ and after the
> restoration was successful and +0fc94de8d94e123585b5baed6972dbe8+ had
> generated new externalized checkpoints I thought it was safe to delete the
> checkpoints from +01dbaf21d7c5e8f8eabd3602e086bb89+ but apparently I was
> wrong.
> I have attached the _metadata file from
> +/home/anttkaik/flink/checkpoints/0fc94de8d94e123585b5baed6972dbe8/chk-12+
> which contains the reference to
> +/home/anttkaik/flink/checkpoints/01dbaf21d7c5e8f8eabd3602e086bb89/shared/0a3c0c1d-c924-4e6d-b6ad-463a75c9fce8+
> which I have deleted.
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