Vladimir Ozerov created IGNITE-2577:
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Summary: Investigate HashMap.Node[] allocations from
GridDistributedTxMapping.add()
Key: IGNITE-2577
URL: https://issues.apache.org/jira/browse/IGNITE-2577
Project: Ignite
Issue Type: Task
Components: cache
Affects Versions: 1.5.0.final
Reporter: Vladimir Ozerov
Fix For: 1.6
*Problem*
GridDistributedTxMapping is initialized with empty HashSet() for TX entries by
default.
When the very first element is added, undelying HashMap expands causing memory
traffic.
*Proposed solutions*
1) Use LinkedList instead. One can notice that when GridDistributedTxMapping is
deserialized using direct reader, "entries" are read as list. Furthermore, both
"reads" and "writes" projections are returned as wrapped views, so that do not
benefit form fast lookups.
If we neither perform lookups from entries, nor require "unique" Set semantics,
"entries" could be changed to LinkedList thus decresaing memory traffic.
2) Use special singleton collection. This way we will have to evaluate all
"entries" usages very carefully.
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