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From "LN (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-700) hbase.io.index.interval need be configuratable in column family
Date Fri, 20 Jun 2008 05:25:45 GMT
hbase.io.index.interval need be configuratable in column family 

                 Key: HBASE-700
                 URL: https://issues.apache.org/jira/browse/HBASE-700
             Project: Hadoop HBase
          Issue Type: Improvement
          Components: regionserver
    Affects Versions: 0.1.2
            Reporter: LN
            Priority: Minor

setting parameter hbase.io.index.interval to smaller can improve hbase reading performance
significantly, esp. in large value size column families. however, small hbase.io.index.interval
cause more memory usage, because all index will read into memory when loading a mapfile.

in my test env, i set hbase.io.index.interval to 1, after inserting about 3M samll size records
to a table(about 1.5G in hadoop file), the regionserver throws OOME.  then i found total size
of  map file index  is 350M.  however, i can't adjust  hbase.io.index.interval to a larger
one, like 32, because other big cell size tables need it be 1.

so, i think make hbase.io.index.interval a column family property should be very important
for performance tuning. 

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