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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1842) HTablePool -- Ride Over Restart
Date Tue, 22 Sep 2009 23:28:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758488#action_12758488

stack commented on HBASE-1842:

In standalone mode, regionserver ports are randomly chosen so as not to clash since all daemons
are running in the one JVM on the one host.  Are you sure you were running pseudo-distributed
mode Barney?  I didn't think we did randomly-chosen ports in this mode?  Changing regionserver
ports under a running client is not something that the client will adjust to automatically
and is not something that happens usually at least in fully distributed mode.  What happens
if you do fully-distributed mode, stop the cluster on client and then retry (Or, after retry,
tell the client that the ports have changed by setting the port in the Configuration passed
to HTablePool).

> HTablePool -- Ride Over Restart
> -------------------------------
>                 Key: HBASE-1842
>                 URL: https://issues.apache.org/jira/browse/HBASE-1842
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.20.0
>         Environment: Configuration:
> Hbase 0.20.0 & Hadoop 0.20.1
> Pseudo distributed mode
> Java client using HTablePool
>            Reporter: Barney Frank
>             Fix For: 0.20.1
> When ZK, Master, Regionserver and my app are running, I stop the Hbase master/regionserver.
 The HBaseClient then begins to complain:
> 16:26:51,273 INFO [HBaseClient] Retrying connect to server: / Already
tried 0 time(s).
> 16:26:53,274 INFO [HBaseClient] Retrying connect to server: / Already
tried 1 time(s).
> ...already tried 9 time(s)....
> 16:27:10,294 INFO [HbaseRPC] Server at / not available yet, Zzzzz...
> I restart the Master and RegionServer and then send more client requests through HTablePool.
 It has the same "Retrying to connect to server:" messages.  I noticed that the port number
it is using is the old port for the region server and not the new one assigned after the restart.
 The HbaseClient does not seem to recover unless I restart the client app.  When I do not
use HTablePool and only Htable it works fine.
> When using HTablePool, the client doesn't seem to refresh with the new regionserver port
after the master/regions are back up.  It gets "stuck" with the info from the settings prior
to the master going down.  The ability to ride over a restart.
> I would appreciate any thoughts or help.

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