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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1984) Clearly document durability versus write performance tradeoff
Date Sun, 15 Nov 2009 17:00:39 GMT
Clearly document durability versus write performance tradeoff

                 Key: HBASE-1984
                 URL: https://issues.apache.org/jira/browse/HBASE-1984
             Project: Hadoop HBase
          Issue Type: Task
            Reporter: Andrew Purtell
             Fix For: 0.21.0

Hadoop 0.21 now has a reliable append and flush feature and this gives us the opportunity
to review some assumptions. The current situation:
* Every edit going to a catalog table is flushed so there's no data loss.
* The user tables edits are flushed every hbase.regionserver.flushlogentries which by default
is 100.

We should call out the durability versus write performance tradeoff in the flushlogentries
description and up on the wiki somewhere, maybe on http://wiki.apache.org/hadoop/PerformanceTuning
. We should also provide two example configurations, one for performance (err on the performance
side but not insane) and one for paranoia.

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