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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1755) Putting 'Meta' table into ZooKeeper
Date Mon, 21 Mar 2011 18:55:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009290#comment-13009290
] 

Jonathan Gray commented on HBASE-1755:
--------------------------------------

I generally agree that we should store temporary data in ZK, but I see META as largely temporary.

Table/region meta data is already persisted on HDFS (we don't properly update, but that can
be fixed without much trouble).  And we have plans to move schema and configuration information
into ZK for online changes, so at least on a running cluster, we'll be depending on ZK for
region configuration.

Otherwise, META is largely for locations.

I also think the possibility exists to keep a META region but maintain region locations in
ZK.

In general, the special casing and exception handling around the reading and updating of META
is extraordinarily painful both in the master and in the regionservers.

> Putting 'Meta' table into ZooKeeper
> -----------------------------------
>
>                 Key: HBASE-1755
>                 URL: https://issues.apache.org/jira/browse/HBASE-1755
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.0
>            Reporter: Erik Holstad
>             Fix For: 0.92.0
>
>
> Moving to 0.22.0

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