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From "Uma Maheswara Rao G (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5545) region can't be opened for a long time. Because the creating File failed.
Date Wed, 18 Apr 2012 04:23:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256191#comment-13256191
] 

Uma Maheswara Rao G commented on HBASE-5545:
--------------------------------------------

@Ram, Ok, in this case, file was not closed as DNs crashed. overwrite flag was already passed
as true from FSUtils. So, it can overwrite only closed files. So, your proposal of deletion
file if exists should be fine. Delete will succeed in any case.
                
> region can't be opened for a long time. Because the creating File failed.
> -------------------------------------------------------------------------
>
>                 Key: HBASE-5545
>                 URL: https://issues.apache.org/jira/browse/HBASE-5545
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.6
>            Reporter: gaojinchao
>            Assignee: gaojinchao
>             Fix For: 0.90.7, 0.92.2, 0.94.0
>
>         Attachments: HBASE-5545.patch
>
>
> Scenario:
> ------------
> 1. File is created 
> 2. But while writing data, all datanodes might have crashed. So writing data will fail.
> 3. Now even if close is called in finally block, close also will fail and throw the Exception
because writing data failed.
> 4. After this if RS try to create the same file again, then AlreadyBeingCreatedException
will come.
> Suggestion to handle this scenario.
> ---------------------------
> 1. Check for the existence of the file, if exists delete the file and create new file.

> Here delete call for the file will not check whether the file is open or closed.
> Overwrite Option:
> ----------------
> 1. Overwrite option will be applicable if you are trying to overwrite a closed file.
> 2. If the file is not closed, then even with overwrite option Same AlreadyBeingCreatedException
will be thrown.
> This is the expected behaviour to avoid the Multiple clients writing to same file.
> Region server logs:
> org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:
failed to create file /hbase/test1/12c01902324218d14b17a5880f24f64b/.tmp/.regioninfo for DFSClient_hb_rs_158-1-131-48,20020,1331107668635_1331107669061_-252463556_25
on client 158.1.132.19 because current leaseholder is trying to recreate file.
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLeaseInternal(FSNamesystem.java:1570)
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1440)
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1382)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:658)
> at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:547)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1137)
> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1133)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1131)
> at org.apache.hadoop.ipc.Client.call(Client.java:961)
> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:245)
> at $Proxy6.create(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at $Proxy6.create(Unknown Source)
> at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.<init>(DFSClient.java:3643)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:778)
> at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:364)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:630)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:611)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:518)
> at org.apache.hadoop.hbase.regionserver.HRegion.checkRegioninfoOnFilesystem(HRegion.java:424)
> at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:340)
> at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:2672)
> at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:2658)
> at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:330)
> at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:116)
> at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:158)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> [2012-03-07 20:51:45,858] [WARN ] [RS_OPEN_REGION-158-1-131-48,20020,1331107668635-23]
[com.huawei.isap.ump.ha.client.RPCRetryAndSwitchInvoker 131] Retrying the method call: public
abstract void org.apache.hadoop.hdfs.protocol.ClientProtocol.create(java.lang.String,org.apache.hadoop.fs.permission.FsPermission,java.lang.String,boolean,boolean,short,long)
throws java.io.IOException with arguments of length: 7. The exisiting ActiveServerConnection
is:
> ActiveServerConnectionInfo:
> Metadata:158-1-131-48/158.1.132.19:9000
> Version:145720623220907
> [2012-03-07 20:51:45,872] [DEBUG] [RS_OPEN_REGION-158-1-131-48,20020,1331107668635-20]
[org.apache.hadoop.hbase.zookeeper.ZKAssign 849] regionserver:20020-0x135ec32b39e0002-0x135ec32b39e0002
Successfully transitioned node 91bf3e6f8adb2e4b335f061036353126 from M_ZK_REGION_OFFLINE to
RS_ZK_REGION_OPENING
> [2012-03-07 20:51:45,873] [DEBUG] [RS_OPEN_REGION-158-1-131-48,20020,1331107668635-20]
[org.apache.hadoop.hbase.regionserver.HRegion 2649] Opening region: REGION => {NAME =>
'test1,00088613810,1331112369360.91bf3e6f8adb2e4b335f061036353126.', STARTKEY => '00088613810',
ENDKEY => '00088613815', ENCODED => 91bf3e6f8adb2e4b335f061036353126, TABLE => {{NAME
=> 'test1', FAMILIES => [{NAME => 'value', BLOOMFILTER => 'NONE', REPLICATION_SCOPE
=> '0', VERSIONS => '3', COMPRESSION => 'GZ', TTL => '86400', BLOCKSIZE =>
'655360', IN_MEMORY => 'false', BLOCKCACHE => 'true'}]}}
> [2012-03-07 20:51:45,873] [DEBUG] [RS_OPEN_REGION-158-1-131-48,20020,1331107668635-20]
[org.apache.hadoop.hbase.regionserver.HRegion 316] Instantiated test1,00088613810,1331112369360.91bf3e6f8adb2e4b335f061036353126.
> [2012-03-07 20:51:45,874] [ERROR] [RS_OPEN_REGION-158-1-131-48,20020,1331107668635-20]
[ 

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