[hbase] Make mapfile index interval configurable
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Key: HADOOP-2485
URL: https://issues.apache.org/jira/browse/HADOOP-2485
Project: Hadoop
Issue Type: Improvement
Components: contrib/hbase
Reporter: stack
Priority: Minor
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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