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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15075) Allow region split request to carry identification information
Date Sat, 16 Jan 2016 23:45:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103493#comment-15103493
] 

stack commented on HBASE-15075:
-------------------------------

Split that takes a UUID? Admin API is user-facing. What is user to make of "UUID"?

Just split gets this attribute? Why don't all operations get a UUID... so can "identify" a
request (whatever that means -- not clear from looking at patch).  General Assignment region
transition now takes a UUID but only used by split (confusing), and even more opaque, by 'normalization'
only.

Assignment is currently being redone. I've not seen mention of UUID per op to date. Did I
miss something or will the new assignment take up this UUID and bake it in everywhere... 


> Allow region split request to carry identification information
> --------------------------------------------------------------
>
>                 Key: HBASE-15075
>                 URL: https://issues.apache.org/jira/browse/HBASE-15075
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: 15075-v0.txt, 15075-v1.txt, 15075-v2.txt, HBASE-15075.v10.patch,
HBASE-15075.v2.patch, HBASE-15075.v3.patch, HBASE-15075.v4.patch, HBASE-15075.v5.patch, HBASE-15075.v6.patch,
HBASE-15075.v7.patch, HBASE-15075.v8.patch, HBASE-15075.v9.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, such as a UUID, 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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