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https://issues.apache.org/jira/browse/OAK-926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13722253#comment-13722253
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Thomas Mueller commented on OAK-926:
------------------------------------
As a temporary solution, I will try to create a patch for the MongoMK to split
documents that are larger than 512 KB, and truncate revisions that are older
than 5 minutes. This is just temporary until the "real" fix is ready.
> MongoMK: split documents when they are too large
> ------------------------------------------------
>
> Key: OAK-926
> URL: https://issues.apache.org/jira/browse/OAK-926
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk
> Reporter: Thomas Mueller
>
> Currently, the MongoMK stores all revisions of a node in the same document.
> Once there are many revisions, the document gets very large.
> The plan is to split the document when it gets big.
> It looks like this isn't just a "nice to have", but also a problem for some
> use cases. Example stack trace:
> {code}
> 21.07.2013 12:35:47.554 *ERROR* ...
> Caused by: java.lang.IllegalArgumentException: 'ok' should never be null...
> at com.mongodb.CommandResult.ok(CommandResult.java:48)
> at com.mongodb.DBCollection.findAndModify(DBCollection.java:375)
> at
> org.apache.jackrabbit.oak.plugins.mongomk.MongoDocumentStore.findAndModify(MongoDocumentStore.java:302)
> ... 32 more
> {code}
> at the same time in the MongoDB log:
> {code}
> Sun Jul 21 12:35:47.334 [conn7] warning: log line attempted (159k) over max
> size(10k),
> printing beginning and end ...
> Assertion: 10334:BSONObj size: 16795219 (0x53460001) is invalid.
> Size must be between 0 and 16793600(16MB)
> First element: :childOrder: { r1400279f22d-0-1: "[]", ...
> {code}
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