[
https://issues.apache.org/jira/browse/HDFS-17769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17988021#comment-17988021
]
ASF GitHub Bot commented on HDFS-17769:
---------------------------------------
hadoop-yetus commented on PR #7602:
URL: https://github.com/apache/hadoop/pull/7602#issuecomment-3030381358
:broken_heart: **-1 overall**
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hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_452-8u452-ga~us1-0ubuntu1~20.04-b09
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hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
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| Subsystem | Report/Notes |
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| Docker | ClientAPI=1.51 ServerAPI=1.51 base:
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| GITHUB PR | https://github.com/apache/hadoop/pull/7602 |
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| modules | C: hadoop-hdfs-project/hadoop-hdfs U:
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This message was automatically generated.
> Allows client to actively retry to Active NameNode when the Observer NameNode
> is too far behind client state id.
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17769
> URL: https://issues.apache.org/jira/browse/HDFS-17769
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 3.3.4, 3.3.6, 3.4.1
> Reporter: Guo Wei
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.2
>
> Attachments: 1.png, 2.png, 3.png
>
>
> When we use Router to forward read requests to the observer, if the cluster
> experiences heavy write workloads, Observer nodes may fail to keep pace with
> edit log synchronization, even if the dfs.ha.tail-edits.in-progress parameter
> is configured, it may still occur.
> This triggers RetriableException: Observer Node is too far behind errors.
> Especially when the client ipc.client.ping parameter is set to true, it will
> strive to wait and constantly retry, which can cause the business to be
> unable to obtain the desired data timely. We should consider having the
> active namenode handle this at this time.
> Here are our some errors and repair verification：
> The stateid of the observer is too far behind the active：
> {code:java}
> // code placeholder
> Tue Apr 15 11:22:41 CST 2025, Active latest txId: 5698245512, Observer latest
> txId:5695118653，Observer far behind: 3126859, time takes0s
> Tue Apr 15 11:22:43 CST 2025, Active latest txId: 5698253145, Observer latest
> txId:5695118653，Observer far behind: 3134492, time takes0s
> Tue Apr 15 11:22:45 CST 2025, Active latest txId: 5698260942, Observer latest
> txId:5695118653，Observer far behind: 3142289, time takes0s
> Tue Apr 15 11:22:47 CST 2025, Active latest txId: 5698268614, Observer latest
> txId:5695123653，Observer far behind: 3144961, time takes0s
> Tue Apr 15 11:22:49 CST 2025, Active latest txId: 5698276490, Observer latest
> txId:5695123653，Observer far behind: 3152837, time takes0s
> Tue Apr 15 11:22:51 CST 2025, Active latest txId: 5698284361, Observer latest
> txId:5695128653，Observer far behind: 3155708, time takes0s
> Tue Apr 15 11:22:54 CST 2025, Active latest txId: 5698292641, Observer latest
> txId:5695128653，Observer far behind: 3163988, time takes0s {code}
>
> RetriableException：
> The client will throw a RetriableException and cannot connect to the router
> for reading:
> {code:java}
> // code placeholder
> 10:16:53.744 [IPC Client (24555242) connection to routerIp:8888 from hdfs]
> DEBUG org.apache.hadoop.ipc.Client - IPC Client (24555242) connection to
> routerIp:8888 from hdfs: stopped, remaining connections 0
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RetriableException):
> Observer Node is too far behind: serverStateId = 5695128653 clientStateId =
> 5698292641
> at sun.reflect.GeneratedConstructorAccessor49.newInstance(Unknown Source)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at
> org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:121)
>
> at
> org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:110)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeMethod(RouterRpcClient.java:505)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeSequential(RouterRpcClient.java:972)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterClientProtocol.getFileInfo(RouterClientProtocol.java:981)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getFileInfo(RouterRpcServer.java:883)
>
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:1044)
>
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
>
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)
>
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)
>
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
>
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1106)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1029)
> 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:1899)
>
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3063)
> Caused by:
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RetriableException):
> Observer Node is too far behind: serverStateId = 5632963133 clientStateId =
> 5635526176
> at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1567)
> at org.apache.hadoop.ipc.Client.call(Client.java:1513)
> at org.apache.hadoop.ipc.Client.call(Client.java:1410)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:258)
>
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:139)
>
> at com.sun.proxy.$Proxy19.getFileInfo(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:966)
>
> at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:637)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invoke(RouterRpcClient.java:654)
>
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeMethod(RouterRpcClient.java:467)
>
> ... 15 more
>
> at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1584)
> at org.apache.hadoop.ipc.Client.call(Client.java:1529)
> at org.apache.hadoop.ipc.Client.call(Client.java:1426)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:258)
>
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:139)
>
> at com.sun.proxy.$Proxy9.getFileInfo(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.lambda$getFileInfo$41(ClientNamenodeProtocolTranslatorPB.java:820)
>
> at
> org.apache.hadoop.ipc.internal.ShadedProtobufHelper.ipc(ShadedProtobufHelper.java:160)
>
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:820)
>
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.RouterObserverReadProxyProvider$RouterObserverReadInvocationHandler.invoke(RouterObserverReadProxyProvider.java:216)
>
> at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:437)
>
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:170)
>
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:162)
>
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:100)
>
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:366)
>
> at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
> at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1770)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1828)
>
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1825)
>
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1840)
>
> at org.apache.hadoop.fs.FileUtil.checkDest(FileUtil.java:611)
> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:468)
> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:432)
> at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:2592)
> at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:2558)
> at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:2520)
> at hadoop.write_then_observer_read2.main(write_then_observer_read2.java:64)
> {code}
>
> repair verification :
> {code:java}
> // code placeholder
> (1) View the status of the cluster NameNode:[root@20w ~]# hdfs haadmin -ns
> hh-rbf-test5 -getAllServiceState
> 20w:8020 active
> 21w:8020 standby
> 22w:8020 observer
> (2) We enable the dfs.namenode.observer.too.stale.retry.active.enable
> parameter and execute a read command on the 21w machine:[root@21w ~]# hdfs
> dfs -cat /t.sh
> /bin/ssh $1
> (3) The read RPC request can be found in hdfs-audit.log in the active
> namennode, so the request is forwarded to the active namenode[root@20w ~]#
> tail -f /data/disk02/var/log/hadoop/hdfs/hdfs-audit.log|grep t.sh
> 2025-04-15 11:24:31,148 INFO FSNamesystem.audit: allowed=true ugi=root
> (auth:SIMPLE) ip=/xx cmd=getfileinfo src=/t.sh dst=null
> perm=null proto=rpc
> 2025-04-15 11:24:31,461 INFO FSNamesystem.audit: allowed=true ugi=root
> (auth:SIMPLE) ip=/xx cmd=open src=/t.sh dst=null
> perm=null proto=rpc
> (4) there are logs of retries to active in the observer log2025-04-15
> 11:24:30,148 WARN namenode.FSNamesystem
> (GlobalStateIdContext.java:receiveRequestState(163)) - Retrying to Active
> NameNode, Observer Node is too far behind: serverStateId = 5695393653
> clientStateId = 5699337672 {code}
>
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