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https://issues.apache.org/jira/browse/OAK-3007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614846#comment-14614846
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Alex Parvulescu commented on OAK-3007:
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I believe that the root cause for the compaction case filling up the cache is
is OAK-3075. but this patch should be applied nonetheless.
> SegmentStore cache does not take "string" map into account
> ----------------------------------------------------------
>
> Key: OAK-3007
> URL: https://issues.apache.org/jira/browse/OAK-3007
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segmentmk
> Reporter: Thomas Mueller
> Fix For: 1.3.3
>
> Attachments: OAK-3007-2.patch, OAK-3007.patch
>
>
> The SegmentStore cache size calculation ignores the size of the field
> Segment.string (a concurrent hash map). It looks like a regular segment in a
> memory mapped file has the size 1024, no matter how many strings are loaded
> in memory. This can lead to out of memory. There seems to be no way to limit
> (configure) the amount of memory used by strings. In one example, 100'000
> segments are loaded in memory, and 5 GB are used for Strings in that map.
> We need a way to configure the amount of memory used for that. This seems to
> be basically a cache. OAK-2688 does this, but it would be better to have one
> cache with a configurable size limit.
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