[jira] [Closed] (OAK-6110) Offline compaction uses too much memory

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-6110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-6110.
---------------------------------

Bulk close for 1.7.0

> Offline compaction uses too much memory 
> ----------------------------------------
>
>                 Key: OAK-6110
>                 URL: https://issues.apache.org/jira/browse/OAK-6110
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: segment-tar
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>              Labels: memory, performance
>             Fix For: 1.7.0, 1.8
>
>
> Using offline compaction on a repository with nodes having many direct child node I observed a steady increase of heap usage. This is cause by using a {{MemoryNodeBuilder}} in {{CompactDiff.childNodeAdded()}}, which causes all those child nodes to be cached in memory. 
> Changing the line
> {code}
> child = EMPTY_NODE.builder();
> {code}
> to 
> {code}
> child = writer.writeNode(EMPTY_NODE).builder();
> {code}
> fixes the problem as the latter returns a {{SegmentNodeBuilder}} where the former returns a {{MemoryNodeBuilder}}.



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