[jira] [Commented] (OAK-7285) Reindexing using --doc-traversal-mode can OOM while aggregation in some cases

["Vikas Saurabh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-7285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16381522#comment-16381522 ] 

Vikas Saurabh commented on OAK-7285:
------------------------------------

Backported to 1.8 in [r1825623|https://svn.apache.org/r1825623].

> Reindexing using --doc-traversal-mode can OOM while aggregation in some cases
> -----------------------------------------------------------------------------
>
>                 Key: OAK-7285
>                 URL: https://issues.apache.org/jira/browse/OAK-7285
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: lucene, mongomk
>    Affects Versions: 1.8.0
>            Reporter: Vikas Saurabh
>            Assignee: Vikas Saurabh
>            Priority: Major
>             Fix For: 1.9.0, 1.10, 1.8.3
>
>
> {{--doc-traversal-mode}} works on the notion of {{preferred}} children which is computed using path fragments that form aggregate rules.
> The idea is reading through aggregated paths should avoid keeping non useful nodes (for path being currently indexed) in memory.
> But, currently, in case, say when there multiple preferred children - {{jcr:content}}, {{metadata}}, then an index defn indexing parent of a very deep tree root would try to read in the whole tree before concluding that it doesn't have preferred children
> e.g. with preferred list - {{jcr:content}} and {{metadata}} and index looking for {{jcr:content}} indexing following structure
> {noformat}
> + /path/being/indexed
>    + very
>       + very
>       + very
>            + deep
>            + tree
> + /some-sibling
> {noformat}
> Currently, while looking for {{jcr:content}}, the code concludes that it doesn't exist only after reaching {{/some-sibling}} (or if number of children read of {{/path/being/indexed}} is >= num_preferred_children).



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