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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10909) Abstract out ZooKeeper usage in HBase - phase 1
Date Fri, 05 Sep 2014 04:42:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122419#comment-14122419

Mikhail Antonov commented on HBASE-10909:

[~stack] yes, I think the subtasks scoped here have been resolved, and the target we aimed
to (get it in before 1.0 release) is achieved. Let's resolve it. The next bits of the work
would go under separate jiras (multi-master, zk-less client etc..interleaving with topology

Thanks a lot for feedbacks and reviews!

> Abstract out ZooKeeper usage in HBase - phase 1
> -----------------------------------------------
>                 Key: HBASE-10909
>                 URL: https://issues.apache.org/jira/browse/HBASE-10909
>             Project: HBase
>          Issue Type: Umbrella
>          Components: Consensus, Zookeeper
>    Affects Versions: 0.99.0
>            Reporter: Mikhail Antonov
>            Assignee: Mikhail Antonov
>             Fix For: 0.99.0, 2.0.0
>         Attachments: HBaseConsensus.pdf, HBaseConsensus.pdf, HBaseConsensus.pdf
> As some sort of follow-up or initial step towards HBASE-10296.
> Whatever consensus algorithm/library may be the chosen, perhaps one of first practical
steps towards this goal would be to better abstract ZK-related API and details, which are
now throughout the codebase (mostly leaked throuth ZkUtil, ZooKeeperWatcher and listeners).
> This jira is umbrella for relevant subtasks. Design doc is attached, for comments/questions
there's a google doc linked.
> This issue covers phase-1 of abstraction work, which includes:
>  - infrastructure to support pluggable coordinated state managers
>  - abstraction of region opening/closing/splitting/merging operations
>  - abstraction of admin operation handlers like CreateTableHandler
>  - abstract ZKTable (reworked it to interface and implementation, allowing for new system
tables-based impl to be developed)
>  - WAL splitting abstraction.

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