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