Raymond Liu created HBASE-7952:
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Summary: Remove update() and Improve ExplicitColumnTracker
performance.
Key: HBASE-7952
URL: https://issues.apache.org/jira/browse/HBASE-7952
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.94.5, 0.94.1
Reporter: Raymond Liu
Assignee: Raymond Liu
Fix For: 0.96.0
In ColumnTracker.java, the update() method is not used by anyone now. And no
one will call checkColumn for different HFiles with update() in between files
to re-walk through the target columns. All columns will be feed to
checkColumn() in order.
So, within ExplicitColumnTracker, the target columns can be optimized to not
dynamic maintain a changing list of columns yet to match. Instead, just move
index through it is enough.
with this optimization to save the time for avoid reconstruct a columns array
upon each row, the checkColumn method's performance could be improved by 10-20%.
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