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From "Alexei Scherbakov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-10913) Reduce heap occupation by o.a.i.i.processors.cache.persistence.file.FilePageStore instances.
Date Sun, 13 Jan 2019 15:29:00 GMT
Alexei Scherbakov created IGNITE-10913:
------------------------------------------

             Summary: Reduce heap occupation by o.a.i.i.processors.cache.persistence.file.FilePageStore
instances.
                 Key: IGNITE-10913
                 URL: https://issues.apache.org/jira/browse/IGNITE-10913
             Project: Ignite
          Issue Type: Improvement
            Reporter: Alexei Scherbakov
             Fix For: 2.8


With large topology and large amount of caches/partitions and enabled persistence could be millions
of FilePageStore objects in heap (for each partition).

Each instance has a reference to a File (field cfgFile) storing as String absolute path to
a partition.

Also internal File inplementation (on example UnixFile) also allocates space for file path.

I observed about 2Gb of heap space occupied by these objects in one of environments.

Solution: dereference (set to null) cfgFile after object creation, create File object lazily
on demand when needed.



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