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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7057) Store Server Load in a Table
Date Fri, 26 Oct 2012 17:57:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485075#comment-13485075

stack commented on HBASE-7057:

Chatting w/ Elliott more on this:

+ sequence id should probably be in .META.
+ having some metrics history would be sweet.  We could let it TTL out after an hour so we
didn't keep too much around (or after an hour do the TSDB rollups if wanted)
+ A TSDB like query page for looking at the cluster over time would be sweet.
+ We should be careful to ensure we do not repeat the mistakes of the distant past when we
used to keep a region history table into which we noted region transition; the problem there
was our trying to record events like close when say, the cluster was going down, and the table
we were trying to write would be down -- the writer could hang

This seems like a small thing to do that could improve usability alot.
> Store Server Load in a Table
> ----------------------------
>                 Key: HBASE-7057
>                 URL: https://issues.apache.org/jira/browse/HBASE-7057
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, UI
>    Affects Versions: 0.96.0
>            Reporter: Elliott Clark
>              Labels: noob
>             Fix For: 0.98.0
> Currently the server hart beat sends over server load and region loads.  This is used
to display and store metrics about a region server.  It is also used to remember the sequence
id of flushes.
> This should be moved into an HBase table.  
> * Allow the last sequence id to persist over a master restart.
> * That would allow the balancer to have a more complete picture of what's happened in
the past.
> * Allow tools to be created to monitor hbase using hbase.
> * Simplify/remove the heartbeat.

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