[jira] [Commented] (HBASE-8537) Dead region server pulled in from ZK

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-8537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656152#comment-13656152 ] 

Jimmy Xiang commented on HBASE-8537:
------------------------------------

One side effect (not faked :) as in the movie I watched last weekend) is that AM tries to assign regions to that dead one, but gets zk events from the new one.  It confuses the AM.
                
> Dead region server pulled in from ZK
> ------------------------------------
>
>                 Key: HBASE-8537
>                 URL: https://issues.apache.org/jira/browse/HBASE-8537
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.98.0
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>
> When a cluster restarts quickly after it's crashed, although a new region server is reported in, the master still pulls in the dead region server from the zk.
> {noformat}
> 2013-05-12 18:32:52,996 INFO  [IPC Server handler 6 on 36000] org.apache.hadoop.hbase.master.ServerManager: Registering server=a1217.halxg.cloudera.com,36020,1368408767773
> ....
> 2013-05-12 18:32:54,653 INFO  [master-a1220.halxg.cloudera.com,36000,1368408767520] org.apache.hadoop.hbase.master.HMaster: Registering server found up in zk but who has not yet reported in: a1217.halxg.cloudera.com,36020,1368378273768
> 2013-05-12 18:32:54,653 INFO  [master-a1220.halxg.cloudera.com,36000,1368408767520] org.apache.hadoop.hbase.master.ServerManager: Registering server=a1217.halxg.cloudera.com,36020,1368378273768
> {noformat}
> We should not pull in the second region server instance from zk.  It is actually dead.  We can figure this out by the hostname, and the port.  We can assume no two region server instances can be alive on the same host, the same port.  To be more cautious, we can check the timestamp as well.  The live one should be that with the late timestamp, not pulled in from zk.

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