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From "Dmitry Goldenberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11367) AlreadyBeingCreatedException "current leaseholder is trying to recreate file" when trying to append to file
Date Thu, 02 Feb 2017 21:12:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15850506#comment-15850506
] 

Dmitry Goldenberg commented on HDFS-11367:
------------------------------------------

{quote}
I think its a good idea to have a best pratice/wiki document for HDFS API.
{quote}

Hi Manjunath,

Has that been filed?

> AlreadyBeingCreatedException "current leaseholder is trying to recreate file" when trying
to append to file
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11367
>                 URL: https://issues.apache.org/jira/browse/HDFS-11367
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.5.0
>         Environment: Red Hat Enterprise Linux Server release 6.8
>            Reporter: Dmitry Goldenberg
>            Assignee: Manjunath Anand
>         Attachments: Appender.java
>
>
> We have code which creates a file in HDFS and continuously appends lines to the file,
then closes the file at the end. This is done by a single dedicated thread.
> We specifically instrumented the code to make sure only one 'client'/thread ever writes
to the file because we were seeing "current leaseholder is trying to recreate file" errors.
> For some background see this for example: https://community.cloudera.com/t5/Storage-Random-Access-HDFS/How-to-append-files-to-HDFS-with-Java-quot-current-leaseholder/m-p/41369
> This issue is very critical to us as any error terminates a mission critical application
in production.
> Intermittently, we see the below exception, regardless of what our code is doing which
is create the file, keep appending, then close:
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException):
failed to create file /data/records_20170125_1.txt for DFSClient_NONMAPREDUCE_-167421175_1
for client 1XX.2XX.1XX.XXX because current leaseholder is trying to recreate file.
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLeaseInternal(FSNamesystem.java:3075)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFileInternal(FSNamesystem.java:2905)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFileInt(FSNamesystem.java:3189)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSNamesystem.java:3153)
>         at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.append(NameNodeRpcServer.java:612)
>         at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.append(AuthorizationProviderProxyClientProtocol.java:125)
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.append(ClientNamenodeProtocolServerSideTranslatorPB.java:414)
>         at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:415)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1767)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)
>  
>         at org.apache.hadoop.ipc.Client.call(Client.java:1411)
>         at org.apache.hadoop.ipc.Client.call(Client.java:1364)
>         at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
>         at com.sun.proxy.$Proxy24.append(Unknown Source)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:483)
>         at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
>         at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
>         at com.sun.proxy.$Proxy24.append(Unknown Source)
>         at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.append(ClientNamenodeProtocolTranslatorPB.java:282)
>         at org.apache.hadoop.hdfs.DFSClient.callAppend(DFSClient.java:1586)
>         at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1626)
>         at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1614)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:313)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:309)
>         at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:309)
>         at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:1161)
>         at com.myco.MyAppender.getOutputStream(MyAppender.java:147)



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