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From "Radim Kolar (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3743) Lower memory consumption used by index sampling
Date Fri, 13 Jan 2012 19:02:40 GMT
Lower memory consumption used by index sampling
-----------------------------------------------

                 Key: CASSANDRA-3743
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3743
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
    Affects Versions: 1.0.6
            Reporter: Radim Kolar


currently j.o.a.c.io.sstable.indexsummary is implemented as ArrayList of KeyPosition (RowPosition
key, long offset)i propose to change it to:

RowPosition keys[]
long offsets[]

and use standard binary search on it. This will lower number of java objects used per entry
from 2 (KeyPosition + RowPosition) to 1 (RowPosition).

For building these arrays convenient ArrayList class can be used and then call to .toArray()
on it.

This is very important because index sampling uses a lot of memory on nodes with billions
rows

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