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Posted to oak-issues@jackrabbit.apache.org by "Julian Reschke (JIRA)" <ji...@apache.org> on 2017/05/23 10:08:04 UTC

[jira] [Commented] (OAK-4863) Reduce query batch size for deleted documents

    [ https://issues.apache.org/jira/browse/OAK-4863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020985#comment-16020985 ] 

Julian Reschke commented on OAK-4863:
-------------------------------------

trunk: [r1762825|http://svn.apache.org/r1762825]
1.4: [r1795892|http://svn.apache.org/r1795892]


> Reduce query batch size for deleted documents
> ---------------------------------------------
>
>                 Key: OAK-4863
>                 URL: https://issues.apache.org/jira/browse/OAK-4863
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: mongomk
>            Reporter: Marcel Reutegger
>            Assignee: Marcel Reutegger
>            Priority: Minor
>              Labels: resilience
>             Fix For: 1.5.11, 1.6.0, 1.4.16
>
>
> MongoVersionGCSupport uses the default batchSize when it queries for possibly deleted documents. The default will initially read 100 documents and then as many as fit into a 4MB response. Depending on the document size a couple of thousand will fit in there and take time to process. It may happen that the MongoDB cursor then times out and the VersionGC fails.
> An easy and safe solution is to reduce the batch size to a given number of documents.



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