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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-6294) The "missing" node cache value breaks the DocumentNodeStore#applyChanges
Date Fri, 02 Jun 2017 09:48:04 GMT

    [ https://issues.apache.org/jira/browse/OAK-6294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034405#comment-16034405
] 

Chetan Mehrotra commented on OAK-6294:
--------------------------------------

The patch creates a scenario which is not possible via using NodeStore api. So it would be
better to first come up with a scenario which leads to such a case. For now I would consider
this patch a workaround and it would hide surfacing the actual problem.

So lets see if we can come up with some scenario for this and then only apply the patch

> The "missing" node cache value breaks the DocumentNodeStore#applyChanges
> ------------------------------------------------------------------------
>
>                 Key: OAK-6294
>                 URL: https://issues.apache.org/jira/browse/OAK-6294
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: documentmk
>    Affects Versions: 1.4.10
>            Reporter: Tomek Rękawek
>              Labels: candidate_oak_1_4, candidate_oak_1_6
>             Fix For: 1.8, 1.7.1
>
>         Attachments: OAK-6294.patch
>
>
> In the {{DocumentNodeStore#nodeCache}}, the special object {{missing}} is being used
to mark the node entries that don't exists in the repository.
> This object should be unwrapped to {{null}} every time we call {{nodeCache#getIfPresent()}}
method. It's not the case in the {{applyChanges()}} method - as a result, we may get a NPE
(since the {{missing.getLastRev() == null}}):
> {noformat}
> Caused by: java.lang.NullPointerException: null
> 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
> 	at org.apache.jackrabbit.oak.plugins.document.PathRev.<init>(PathRev.java:40)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.applyChanges(DocumentNodeStore.java:1171)
> 	at org.apache.jackrabbit.oak.plugins.document.Commit.applyToCache(Commit.java:667)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$3.headOfQueue(DocumentNodeStore.java:674)
> 	at org.apache.jackrabbit.oak.plugins.document.CommitQueue.waitUntilHeadOfQueue(CommitQueue.java:240)
> 	at org.apache.jackrabbit.oak.plugins.document.CommitQueue.done(CommitQueue.java:92)
> 	at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.done(DocumentNodeStore.java:668)
> {noformat}
> (taken from the production instance running the Oak 1.4.10).
> //cc: [~chetanm], [~mreutegg], [~catholicon]



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