Nicolas Liochon created HBASE-11226:
---------------------------------------
Summary: Document and increase the default value for
hbase.hstore.flusher.count
Key: HBASE-11226
URL: https://issues.apache.org/jira/browse/HBASE-11226
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 0.98.2, 0.99.0
Reporter: Nicolas Liochon
Assignee: Nicolas Liochon
Fix For: 0.99.0, 0.98.3
HBASE-6466 add the possibility to have multiple threads for the flusher.
The default value is 1, but this should be incremented to 2 reasons:
- I've observed that the flush of a region can be delayed because another is
in progress. During a write load, this leads to an increased latency because
the memstore size increases and then block the client
- if, by accident, a flusher hits a slow or bad datanode, all the flush will
have to wait until the timeouts expires. With 2 or more flushers and some luck
the other regions will be flushed by the second thread.
Lastly this setting is important enough to be documented in the standard hbase
site imho.
I think it's important enough to go in the .98 branch as well
There will be an impact: as the flush won't be queued (or less queued) we may
have more compactions...
--
This message was sent by Atlassian JIRA
(v6.2#6252)
