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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15075) Allow region split request to carry metadata
Date Thu, 07 Jan 2016 19:19:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15087909#comment-15087909
] 

Ted Yu commented on HBASE-15075:
--------------------------------

Since the metadata goes through protobuf, the following seems better fit:
org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.UUID

> 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
>
> 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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