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From "Jean-Daniel Cryans (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 21:11:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798179#action_12798179

Jean-Daniel Cryans commented on HBASE-2052:

Going from 3 to 1 puts more stress on the master for large clusters, but also gives faster
splits. I can't give a number on how slower the master can be, or how busier it will be with
X number of nodes. I expect that no one will see the difference.

The best would be to have the heartbeat separated from the message passing. This is one of
the goal of the master redesign.

> 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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