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https://issues.apache.org/jira/browse/HDFS-14161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725201#comment-16725201
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Íñigo Goiri edited comment on HDFS-14161 at 12/19/18 5:31 PM:
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Well, the same test that I added for {{TestRouterClientRejectOverload}} would
apply here.
Create a mini cluster with two Routers and trigger a method that uses
{{invokeSequential()}} which makes it run out of connections in one Namenode
and make sure it fails over to the other Router.
So pretty much the same but with a method that uses {{invokeSequential()}};
maybe get file info?
You even have the tooling to simulate slow NNs.
The other thing to notice is that we are currently leveraging StandbyException.
Maybe we want to switch all to retriable.
In any case, we should be consistent across the different uses.
was (Author: elgoiri):
Well, the same test that I added for {{TestRouterClientRejectOverload}} would
apply here.
Create a mini cluster with two Routers and trigger a method that uses
{{invokeSequential()}} which makes it run out of connections in one Namenode
and make sure it fails over to the other Router.
So pretty much the same but with a method that uses {{invokeSequential()}};
maybe get file info?
You even have the tooling to simulate slow NNs.
> RBF: Throw RetriableException instead of IOException so that client can retry
> when can not get connection
> ---------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14161
> URL: https://issues.apache.org/jira/browse/HDFS-14161
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.1.1, 2.9.2, 3.0.3
> Reporter: Fei Hui
> Assignee: Fei Hui
> Priority: Major
> Attachments: HDFS-14161.001.patch
>
>
> Hive Client may hang when get IOException, stack follows
> {code:java}
> Exception in thread "Thread-150" java.lang.RuntimeException:
> org.apache.hadoop.ipc.RemoteException(java.io.IOException): Cannot get a
> connection to bigdata-nn20.g01:8020
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.getConnection(RouterRpcClient.java:262)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeMethod(RouterRpcClient.java:380)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeSequential(RouterRpcClient.java:752)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getFileInfo(RouterRpcServer.java:1152)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:849)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2134)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2130)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1867)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2130)
> at
> org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:554)
> at org.apache.hadoop.hive.ql.exec.TaskRunner.run(TaskRunner.java:74)
> Caused by: org.apache.hadoop.ipc.RemoteException(java.io.IOException): Cannot
> get a connection to bigdata-nn20.g01:8020
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.getConnection(RouterRpcClient.java:262)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeMethod(RouterRpcClient.java:380)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeSequential(RouterRpcClient.java:752)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getFileInfo(RouterRpcServer.java:1152)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:849)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2134)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2130)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1867)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2130)
> at org.apache.hadoop.ipc.Client.call(Client.java:1503)
> at org.apache.hadoop.ipc.Client.call(Client.java:1441)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
> at com.sun.proxy.$Proxy14.getFileInfo(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:775)
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:253)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:101)
> at com.sun.proxy.$Proxy15.getFileInfo(Unknown Source)
> at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2111)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1390)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1386)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1402)
> at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1494)
> at
> org.apache.hadoop.hive.ql.session.SessionState.createPath(SessionState.java:719)
> at
> org.apache.hadoop.hive.ql.session.SessionState.createTmpTableSpaceDir(SessionState.java:635)
> at
> org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:613)
> at
> org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:540)
> ... 1 more
> {code}
> If router throw RetriableException when can not get connection and client set
> *dfs.client.retry.policy.enabled* true, this problem can be resvoled.
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