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https://issues.apache.org/jira/browse/HADOOP-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HADOOP-2485:
--------------------------
Attachment: 2485.patch
Hudson won't pick up my patch. Trying again with a differently named patch to
see if that makes a difference.
> [hbase] Make mapfile index interval configurable
> ------------------------------------------------
>
> Key: HADOOP-2485
> URL: https://issues.apache.org/jira/browse/HADOOP-2485
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: stack
> Assignee: stack
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: 2485.patch, index.patch
>
>
> Default mapfile index interval is every 128 entries. Basic tests show
> PerformanceEvaluation mapfile test random reading 100k records in 60plus
> seconds. If index interval is set to 1 so we don't have to next around
> looking for our record, then 100k random reads take 7 seconds. This is using
> local filesystem. If I set it to 16, then takes 12 seconds.
> Testing doing PerformanceEvaluation random reads against hbase, with interval
> set to 16, we run 50% faster (hdfs is in the picture).
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