Duo Zhang created HBASE-16278:
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Summary: Use ConcurrentHashMap instead of ConcurrentSkipListMap if
possible
Key: HBASE-16278
URL: https://issues.apache.org/jira/browse/HBASE-16278
Project: HBase
Issue Type: Bug
Reporter: Duo Zhang
SSD and 10G network make our system CPU bound again, so the speed of memory
operation only code becomes more and more important.
In HBase, if want to use byte[] as a map key, then we will always use CSLM even
if we do not need the map to be ordered. I know that this could save one object
allocation since we can not use byte[] directly as CHM's key. But we all know
that CHM is faster than CSLM, so I wonder if it worth to use CSLM instead of
CHM only because one extra object allocation.
Then I wrote a simple jmh micro benchmark to test the performance of CHM and
CSLM. The code could be found here
https://github.com/Apache9/microbench
It turns out that CHM is still much faster than CSLM with one extra object
allocation.
So I think we should always use CHM if we do not need the keys to be sorted.
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