Timothee Maret created OAK-2969:
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Summary: Reduce DocumentStore UpdateOp memory footprint
Key: OAK-2969
URL: https://issues.apache.org/jira/browse/OAK-2969
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core
Affects Versions: 1.2.2
Reporter: Timothee Maret
As described in [0] large commits consume a fair amount of memory. With very
large commits, this become problematic as commits may eat up 100GB or more and
thus causing OOME and aborting the commit.
For instances using the DocumentStore and for cases where the tree is deep but
not sparse, some of the HashMaps in
{code}
org.apache.jackrabbit.oak.plugins.document.UpdateOp
{code}
actually contain less entries than their capacity (built with default capacity).
This issue covers a simple way to reduce the memory consumption in this case by
simply creating HashMaps of the required capacity (where applicable) or of
minimal capacity (1) where unknown.
[0] http://permalink.gmane.org/gmane.comp.apache.jackrabbit.oak.devel/8196
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