Hi, 这是因为savepoint的_metadata文件中存储的是savepoint文件的绝对路径，而非相对路径，所以恢复的时候仍然会找旧的集群。
从现有资料看，savepoint仍然无法迁移。详情可以参考 [1] 和 [2]。 [1] https://ci.apache.org/projects/flink/flink-docs-release-1.9/ops/state/savepoints.html#triggering-savepoints [2] https://issues.apache.org/jira/browse/FLINK-5763 BR, Qi Kang > On Oct 10, 2019, at 17:13, 蒋涛涛 <[email protected]> wrote: > > HI all， > > 本来在Flink集群迁移过程中，使用版本flink > 1.6.2，将savepoint进行保存，并迁移到新的hdfs集群的时候，并从该savepoint进行恢复的时候，出现找不到之前hdfs集群信息的错误信息，错误如下： > > java.lang.Exception: Exception while creating StreamOperatorStateContext. > at > org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:192) > at > org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:250) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) > at java.lang.Thread.run(Thread.java:745) > Caused by: org.apache.flink.util.FlinkException: Could not restore operator > state backend for StreamSource_cbc357ccb763df2852fee8c4fc7d55f2_(1/1) from > any of the 1 provided restore options. > at > org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:137) > at > org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.operatorStateBackend(StreamTaskStateInitializerImpl.java:242) > at > org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:140) > ... 5 more > Caused by: java.io.IOException: Cannot instantiate file system for URI: > hdfs://xxx/user/flink_1.6/savepoints/savepoint-ab68c7-562a00439efe/2e56b78a-fa36-4cf4-a383-990358fcd539 > at > org.apache.flink.runtime.fs.hdfs.HadoopFsFactory.create(HadoopFsFactory.java:187) > at > org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:399) > at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:318) > at > org.apache.flink.runtime.state.filesystem.FileStateHandle.getFileSystem(FileStateHandle.java:100) > at > org.apache.flink.runtime.state.filesystem.FileStateHandle.openInputStream(FileStateHandle.java:68) > at > org.apache.flink.runtime.state.OperatorStreamStateHandle.openInputStream(OperatorStreamStateHandle.java:66) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.restore(DefaultOperatorStateBackend.java:495) > at > org.apache.flink.runtime.state.DefaultOperatorStateBackend.restore(DefaultOperatorStateBackend.java:64) > at > org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:151) > at > org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:123) > ... 7 more > Caused by: java.lang.IllegalArgumentException: > java.net.UnknownHostException: xxx > at > org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:439) > at > org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:321) > at > org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:690) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:631) > at > org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:160) > at > org.apache.flink.runtime.fs.hdfs.HadoopFsFactory.create(HadoopFsFactory.java:159) > ... 16 more > Caused by: java.net.UnknownHostException: xxx > ... 23 more > > 补充： > 这个的xxx指的是原hdfs的clustername，用这个方式进行任务的迁移会出现这样的问题，checkpoint也有类似的错误，请问下为什么会出现这样的问题，并如何解决，谢谢 > > 祝好
