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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-2583) Investigate CHM8 allocations in GridDhtTxLocalAdapter.
Date Mon, 08 Feb 2016 09:43:39 GMT
Vladimir Ozerov created IGNITE-2583:
---------------------------------------

             Summary: Investigate CHM8 allocations in GridDhtTxLocalAdapter.
                 Key: IGNITE-2583
                 URL: https://issues.apache.org/jira/browse/IGNITE-2583
             Project: Ignite
          Issue Type: Sub-task
          Components: cache
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ozerov
             Fix For: 1.6


*Problem*
Whenever GridDhtTxLocalAdapter is allocated, two CHM8-s are created immediately: "nearMap"
and "dhtMap". 
This is visible as a memory hotspot, which is responsible for >2% of overall allocations
during single PUT.

*Proposed solution*
1) Investigate whether we really need concurrent semantics here. Can these maps be replaced
with HashMap-s or (HashMap + synchronzied)?
2) Investigate whether we can optimize for single-mapping scenario.



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