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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4397) "-ROOT-", ".META." table stay offline for too long in the case of all RSs are shutdown at the same time
Date Fri, 30 Dec 2011 21:06:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177756#comment-13177756
] 

Lars Hofhansl commented on HBASE-4397:
--------------------------------------

Nice find and patch... +1

(As a sidenote... Do we have to rethink this entire ROOT and META "huh hah"? There isn't a
week going by without some new bug about races between splitting and assignment, or the master
being stuck assigning ROOT/META, or similar cases. There are too many players that need to
be kept in synch: The FS, ROOT/META, Zookeekper).

                
> "-ROOT-", ".META." table stay offline for too long in the case of all RSs are shutdown
at the same time
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4397
>                 URL: https://issues.apache.org/jira/browse/HBASE-4397
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HBASE-4397-0.92.patch
>
>
> 1. Shutdown all RSs.
> 2. Bring all RS back online.
> The "-ROOT-", ".META." stay in offline state until timeout monitor force assignment 30
minutes later. That is because HMaster can't find a RS to assign the tables to in assign operation.
> 011-09-13 13:25:52,743 WARN org.apache.hadoop.hbase.master.AssignmentManager: Failed
assignment of -ROOT-,,0.70236052 to sea-lab-4,60020,1315870341387, trying to assign elsewhere
instead; retry=0
> java.net.ConnectException: Connection refused
>         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>         at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
>         at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
>         at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:373)
>         at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:345)
>         at org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:1002)
>         at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:854)
>         at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:148)
>         at $Proxy9.openRegion(Unknown Source)
>         at org.apache.hadoop.hbase.master.ServerManager.sendRegionOpen(ServerManager.java:407)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1408)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1153)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1128)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1123)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assignRoot(AssignmentManager.java:1788)
>         at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.verifyAndAssignRoot(ServerShutdownHandler.java:100)
>         at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.verifyAndAssignRootWithRetries(ServerShutdownHandler.java:118)
>         at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:181)
>         at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:167)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:662)
> 2011-09-13 13:25:52,743 WARN org.apache.hadoop.hbase.master.AssignmentManager: Unable
to find a viable location to assign region -ROOT-,,0.70236052
> Possible fixes:
> 1. Have serverManager handle "server online" event similar to how RegionServerTracker.java
calls servermanager.expireServer in the case server goes down.
> 2. Make timeoutMonitor handle the situation better. This is a special situation in the
cluster. 30 minutes timeout can be skipped.

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