Lower memory consumption used by index sampling
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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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