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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11462) MetaTableAccessor shouldn't use ZooKeeeper
Date Tue, 16 Sep 2014 23:17:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136474#comment-14136474

Mikhail Antonov commented on HBASE-11462:

[~stack] just noticed there two v3 patches attached, one of them is mine, another one is yours.
Did you intend to attach some modified patch v4?

> MetaTableAccessor shouldn't use ZooKeeeper
> ------------------------------------------
>                 Key: HBASE-11462
>                 URL: https://issues.apache.org/jira/browse/HBASE-11462
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, Zookeeper
>    Affects Versions: 2.0.0
>            Reporter: Mikhail Antonov
>            Assignee: Mikhail Antonov
>             Fix For: 2.0.0
>         Attachments: HBASE-11462.v1.patch, HBASE-11462.v2.patch, HBASE-11462.v3.patch
> After committing patch for HBASE-4495, there's an further improvement which can be made
(discussed originally on review board to that jira).
> We have MetaTableAccessor and MetaTableLocator classes. First one is used to access information
stored in hbase:meta table. Second one is used to deal with ZooKeeper state to find out region
server hosting hbase:meta, wait for it to become available and so on.
> MetaTableAccessor, in turn, should only operate on the meta table content, so shouldn't
need ZK. The only reason why MetaTableAccessor is using ZK - when callers request assignment
information, they can request location of meta table itself, which we can't read from meta,
so in that case MetaTableAccessor relays the call to MetaTableLocator.  May be the solution
here is to declare that clients of MetaTableAccessor shall not use it to work with meta table
itself (not it's content).

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