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From "Phabricator (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5332) Deterministic Compaction Jitter
Date Fri, 17 Feb 2012 23:50:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phabricator updated HBASE-5332:
-------------------------------

    Attachment: D1785.1.patch

nspiegelberg requested code review of "[jira] [HBASE-5332] Deterministic Compaction Jitter".
Reviewers: JIRA, Kannan, aaiyer, stack

  Changing the jitter in major compactions to be deterministic,
  so reboots don't cause a time-based compaction storm.  This
  implementation seeds a random number generator with HDFS data for
  persistence.

TEST PLAN
   - mvn test -Dtest=TestCompaction,TestCompactSelection,TestHeapSize

REVISION DETAIL
  https://reviews.facebook.net/D1785

AFFECTED FILES
  src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
  src/test/java/org/apache/hadoop/hbase/regionserver/TestCompactSelection.java
  src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java

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> Deterministic Compaction Jitter
> -------------------------------
>
>                 Key: HBASE-5332
>                 URL: https://issues.apache.org/jira/browse/HBASE-5332
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>         Attachments: D1785.1.patch
>
>
> Currently, we add jitter to a compaction using "delay + jitter*(1 - 2*Math.random())".
 Since this is non-deterministic, we can get major compaction storms on server restart as
half the Stores that were set to "delay + jitter" will now be set to "delay - jitter".  We
need a more deterministic way to jitter major compactions so this information can persist
across server restarts.

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