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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8749) Potential race condition between FSUtils.renameAndSetModifyTime() and LogCleaner
Date Sun, 16 Jun 2013 15:39:19 GMT
Ted Yu created HBASE-8749:
-----------------------------

             Summary: Potential race condition between FSUtils.renameAndSetModifyTime() and
LogCleaner
                 Key: HBASE-8749
                 URL: https://issues.apache.org/jira/browse/HBASE-8749
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.95.1
            Reporter: Ted Yu


We recently saw the following running 0.95.1 on hadoop 2.0:
{code}
2013-06-11 21:51:22,199 ERROR [IPC Server handler 18 on 60000] master.HMaster: Region server
ip-10-138-2-28.ec2.internal,60020,1370887927492 reported a fatal error:
ABORTING region server ip-10-138-2-28.ec2.internal,60020,1370887927492: IOE in log roller
Cause:
java.io.FileNotFoundException: File/Directory /hbase/.oldlogs/ip-10-138-2-28.ec2.internal%2C60020%2C1370887927492.1370986265468
does not exist.
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setTimesInt(FSNamesystem.java:1488)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setTimes(FSNamesystem.java:1453)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.setTimes(NameNodeRpcServer.java:798)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.setTimes(ClientNamenodeProtocolServerSideTranslatorPB.java:704)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:43194)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:910)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1694)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1690)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1367)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1688)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:90)
	at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:57)
	at org.apache.hadoop.hdfs.DFSClient.setTimes(DFSClient.java:2097)
	at org.apache.hadoop.hdfs.DistributedFileSystem.setTimes(DistributedFileSystem.java:813)
	at org.apache.hadoop.hbase.util.FSUtils.renameAndSetModifyTime(FSUtils.java:1596)
	at org.apache.hadoop.hbase.regionserver.wal.FSHLog.archiveLogFile(FSHLog.java:705)
	at org.apache.hadoop.hbase.regionserver.wal.FSHLog.cleanOldLogs(FSHLog.java:595)
	at org.apache.hadoop.hbase.regionserver.wal.FSHLog.rollWriter(FSHLog.java:536)
	at org.apache.hadoop.hbase.regionserver.LogRoller.run(LogRoller.java:96)
	at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.hadoop.ipc.RemoteException(java.io.FileNotFoundException): File/Directory
/hbase/.oldlogs/ip-10-138-2-28.ec2.internal%2C60020%2C1370887927492.1370986265468 does not
exist.
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setTimesInt(FSNamesystem.java:1488)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setTimes(FSNamesystem.java:1453)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.setTimes(NameNodeRpcServer.java:798)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.setTimes(ClientNamenodeProtocolServerSideTranslatorPB.java:704)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:43194)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:910)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1694)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1690)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1367)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1688)

	at org.apache.hadoop.ipc.Client.call(Client.java:1164)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
	at com.sun.proxy.$Proxy11.setTimes(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
	at com.sun.proxy.$Proxy11.setTimes(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.setTimes(ClientNamenodeProtocolTranslatorPB.java:685)
	at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.apache.hadoop.hbase.fs.HFileSystem$1.invoke(HFileSystem.java:266)
	at com.sun.proxy.$Proxy12.setTimes(Unknown Source)
	at org.apache.hadoop.hdfs.DFSClient.setTimes(DFSClient.java:2095)
	... 7 more

2013-06-11 21:51:32,976 INFO  [main-EventThread] zookeeper.RegionServerTracker: RegionServer
ephemeral node deleted, processing expiration [ip-10-138-2-28.ec2.internal,60020,1370887927492]
{code}
One scenario that could have led to the above exception was that the LogCleaner thread deleted
the log file which had just been moved to .oldlogs dir before the call to fs.setTimes() executed.
When fs.setTimes() ran, the file was no longer there.

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