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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15075) Allow region split request to carry metadata
Date Tue, 12 Jan 2016 01:23:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15093070#comment-15093070
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Andrew Purtell commented on HBASE-15075:
----------------------------------------

The description on this issue implies something generic ("metadata" is a generic term). This
patch only amends method calls to  pass through an extra argument, a UUID. Why use UUID? Why
not a random long? Should we add API so split requests can pass arbitrary metadata as issue
description implies? Should every request type be extended like this? I.e. merge transactions?


> Allow region split request to carry metadata
> --------------------------------------------
>
>                 Key: HBASE-15075
>                 URL: https://issues.apache.org/jira/browse/HBASE-15075
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>         Attachments: 15075-v0.txt, 15075-v1.txt, 15075-v2.txt, HBASE-15075.v2.patch,
HBASE-15075.v3.patch
>
>
> During the process of improving region normalization feature, I found that if region
split request triggered by the execution of SplitNormalizationPlan fails, there is no way
of knowing whether the failed split originated from region normalization.
> The association of particular split request with outcome of split would give RegionNormalizer
information so that it can make better normalization decisions in the subsequent invocations.
> One approach is to embed metadata in SplitRequest which gets passed through RegionStateTransitionContext
when RegionServerServices#reportRegionStateTransition() is called.
> This way, RegionStateListener can be notified with the metadata (id of the requester).
> See discussion on dev mailing list
> http://search-hadoop.com/m/YGbbCXdkivihp2



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