Re: 从checkpoint恢复任务失败

Thu, 16 Jan 2020 11:27:08 -0800 

Hi

确定每次恢复的时候没有其他异常么，之前有用户遇到是因为其他异常，触发cancel task的逻辑，导致清理了本地下载的文件，所以在进行硬链的时候会遇到no 
such file的异常。

祝好
唐云

________________________________
From: claylin <1012539...@qq.com>
Sent: Thursday, January 16, 2020 22:00
To: user-zh <user-zh@flink.apache.org>
Subject: 从checkpoint恢复任务失败

用的版本1.9.1，我这里只要遇到异常，譬如空指针异常，然后从checkpoint恢复，总是恢复失败，报找不到sst文件的错误，错误堆栈如下：
2020-01-16 19:29:39
java.lang.Exception: Exception while creating StreamOperatorStateContext.
        at 
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:195)
        at 
org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:253)
        at 
org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:881)
        at 
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:395)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.util.FlinkException: Could not restore keyed state 
backend for KeyedProcessOperator_8ea7af242b2bcc2d11daf69b5d588c4d_(31/32) 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:307)
        at 
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:135)
        ... 6 more
Caused by: org.apache.flink.runtime.state.BackendBuildingException: Caught 
unexpected exception.
        at 
org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:326)
        at 
org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:520)
        at 
org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:291)
        at 
org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
        at 
org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
        ... 8 more
Caused by: java.nio.file.NoSuchFileException: 
/data/hadoop/tmp/nm-local-dir/usercache/www-data/appcache/application_1579002711906_0001/flink-io-bd910c0d-03c7-48ff-8712-4e7059bac574/job_bbe797c8fcdf7c362bed774435ae5f86_op_KeyedProcessOperator_8ea7af242b2bcc2d11daf69b5d588c4d__31_32__uuid_7259cf96-aa16-423e-a356-dcac0a7859f2/db/000019.sst
 -&gt; 
/data/hadoop/tmp/nm-local-dir/usercache/www-data/appcache/application_1579002711906_0001/flink-io-bd910c0d-03c7-48ff-8712-4e7059bac574/job_bbe797c8fcdf7c362bed774435ae5f86_op_KeyedProcessOperator_8ea7af242b2bcc2d11daf69b5d588c4d__31_32__uuid_7259cf96-aa16-423e-a356-dcac0a7859f2/40e6dc65-7fac-41ae-b736-91c4ecd5e296/000019.sst
        at 
sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at 
sun.nio.fs.UnixFileSystemProvider.createLink(UnixFileSystemProvider.java:476)
        at java.nio.file.Files.createLink(Files.java:1086)
        at 
org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreInstanceDirectoryFromPath(RocksDBIncrementalRestoreOperation.java:473)
        at 
org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreFromLocalState(RocksDBIncrementalRestoreOperation.java:212)
        at 
org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreFromRemoteState(RocksDBIncrementalRestoreOperation.java:188)
        at 
org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restoreWithoutRescaling(RocksDBIncrementalRestoreOperation.java:162)
        at 
org.apache.flink.contrib.streaming.state.restore.RocksDBIncrementalRestoreOperation.restore(RocksDBIncrementalRestoreOperation.java:148)
        at 
org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:270)
        ... 12 more



从错误日志看，首先从远程dfs下载checkpoint，下载到本地后，再做链接，但是在链接过程报错找不到文件，这个难道是权限问题吗

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