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From "Zhihong Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5914) Bulk assign regions in the process of ServerShutdownHandler
Date Thu, 03 May 2012 02:43:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267127#comment-13267127
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Zhihong Yu commented on HBASE-5914:
-----------------------------------

bq. I think we needn't whether servers is empty, if it is empty, bulkPlan is null
Is that so ?
{code}
+      servers.removeAll(failedPlans.keySet());
{code}
If servers become empty (failedPlans is not empty), we don't need to execute the following
loop:
{code}
+      for (Map.Entry<ServerName, List<HRegionInfo>> e : failedPlans.entrySet())
{
{code}
Coming out of the top-most quickAssign() call, how do we know that regions have been assigned
?

                
> Bulk assign regions in the process of ServerShutdownHandler
> -----------------------------------------------------------
>
>                 Key: HBASE-5914
>                 URL: https://issues.apache.org/jira/browse/HBASE-5914
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0
>
>         Attachments: HBASE-5914.patch, HBASE-5914v2.patch
>
>
> In the process of ServerShutdownHandler, we currently assign regions singly.
> In the large cluster, one regionserver always carried many regions, this action is  quite
slow.
> What about using bulk assign regions like cluster start up.
> In current logic,  if we failed assigning many regions to one destination server, we
will wait unitl timeout, 
> however in the process of ServerShutdownHandler, we should retry it to another server.

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