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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2052) Make hbase more 'live' when comes to noticing table creation, splits, etc., for 0.20.3
Date Fri, 08 Jan 2010 11:08:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797978#action_12797978

dhruba borthakur commented on HBASE-2052:

Does this patch has any performance implication for large clusters?

It appears to me that when a region is split, the RegionServer has to inform the master. This
occurs in the next heartbeat from the region server to the master. If so, can the regionserver
send a immediate heartbeat message after a region split instead of waiting for the next  hbase.regionserver.msginteral
to expire?

> Make hbase more 'live' when comes to noticing table creation, splits, etc., for 0.20.3
> --------------------------------------------------------------------------------------
>                 Key: HBASE-2052
>                 URL: https://issues.apache.org/jira/browse/HBASE-2052
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.20.3
>         Attachments: HBASE-2052.patch
> Clusters > 10 are less frequent that smaller clusters.  Defaults for when messages
are sent from regionserver to master would seem to favor clusters that are much larger than
ten nodes.  This issue is about changing them so the basic hbase setup is more live.  Its
about downing the interval between RS sending messages from 3 to 1 second and of making clients
retry more frequently at least at the start of the timeout period so they pick up changes
the quicker.  This should help with stuff like noticing splits and new regions coming on line.
 See HBASE-1892 for background.

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