Jonathan Lawlor created HBASE-13421:
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Summary: Reduce the number of object creations introduced by
HBASE-11544 in scan RPC hot code paths
Key: HBASE-13421
URL: https://issues.apache.org/jira/browse/HBASE-13421
Project: HBase
Issue Type: Sub-task
Reporter: Jonathan Lawlor
Assignee: Jonathan Lawlor
Fix For: 2.0.0, 1.1.0
HBASE-11544 made NextState the new return type of RegionScanner#nextRaw
InternalScanner#next to allow state information to be passed back from a
scanner (it was formerly a boolean indicating whether or not more values
existed). The change in this return type led to an increased amount of objects
being created... In the case that a scan spanned millions of rows, there was
the potential for millions of object to be created.
This issue looks to reduce the large amount of object creations from
potentially many to at most one per RPC request.
Please see the tail of the parent issue for relevant discussion on the design
decisions related to this solution. This sub-task has been filed as it seems
more appropriate to address the fix here rather than as an addendum to the
parent.
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