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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13412) Region split decisions should have jitter
Date Mon, 11 May 2015 21:04:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Purtell updated HBASE-13412:
    Fix Version/s: 0.98.13

Both the original commit and addendum picked back to 0.98 cleanly and the new test passes
repeatedly (ran it 10 times)

This change introduces a new configuration parameter and a behavioral change for ConstantSizeRegionSplitPolicy
and policies that inherit from it. The change is desirable (it's the raison d'etre of this
issue) but to alleviate any compatibility concerns I committed an addendum to 0.98 only that
will not apply jitter unless the new configuration parameter is explicitly set.

> Region split decisions should have jitter
> -----------------------------------------
>                 Key: HBASE-13412
>                 URL: https://issues.apache.org/jira/browse/HBASE-13412
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 1.0.0, 2.0.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.1.0, 0.98.13
>         Attachments: HBASE-13412-v1.patch, HBASE-13412-v2.patch, HBASE-13412-v3.patch,
HBASE-13412.addendum.0.98.patch, HBASE-13412.patch, hbase-13412.addendum.patch
> Whenever a region splits it causes lots of IO (compactions are queued for a while). Because
of this it's important to make sure that well distributed tables don't have all of their regions
split at exactly the same time.
> This is basically the same as our compaction jitter.

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