Geoffrey Jacoby created HBASE-17912:
---------------------------------------
Summary: Avoid major compactions on region server startup
Key: HBASE-17912
URL: https://issues.apache.org/jira/browse/HBASE-17912
Project: HBase
Issue Type: Improvement
Components: Compaction
Affects Versions: 0.98.24, 1.3.1, 2.0.0
Reporter: Geoffrey Jacoby
Assignee: Geoffrey Jacoby
The HRegionServer.CompactionChecker chore wakes up every 10s and for each store
in each region mods against a chore frequency (by default slightly under 3
hours) to see if it's time to check if a major compaction is necessary for that
store.
The check to see if it needs to check for major compactions is calculated by
if (iteration % multiplier != 0) continue;
where iteration is the number of times the chore has woken up.
Because 0 % anything is 0, this will always check for necessary major
compactions on each store when this chore is first run after the region server
starts up. This can result in compaction storms when doing a rolling restart,
because, for example, the new instance of the region server might get a lower
jitter value than the old one had.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
