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From "Unico Hommes (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3289) Concurrent remove operation right after move operation causes missing child inconsistency
Date Sun, 08 Apr 2012 09:38:18 GMT
Concurrent remove operation right after move operation causes missing child inconsistency

                 Key: JCR-3289
                 URL: https://issues.apache.org/jira/browse/JCR-3289
             Project: Jackrabbit Content Repository
          Issue Type: Bug
    Affects Versions: 2.4
            Reporter: Unico Hommes
            Priority: Critical
             Fix For: 2.4.2
         Attachments: ConcurrentAddMoveRemoveTest.patch

The scenario is as follows:
1. Thread thr1 does a move operation on node /folder1/node to destination /folder2/node
2. Thread thr2 does a remove operation on node /folder1/node
3. Thread thr1 does session save
4. Thread thr2 does session save

A consistency check shows that /folder2 has a child node entry for inexistent child node node.

The problem is that step 4. should fail whereas it doesn't.

This is caused by the fact that the ItemSaveOperation.removeTransientItems puts the overlayed
state of the transient state in the changelog instead of the transient state itself. But the
 overlayed state has the updated modcount of the previous move operation. Therefore when the
shared item state manager persists the changelog it doesn't detect that the remove was done
on a stale item and so the update can succeed.

Attached is a patch containing a testcase that reproduces the inconsistency with this scenario.

The test creates two nodes /folder1 and /folder2 and then executes the following operations
1. add a node to either /folder1 or /folder2
2. remove a node from either /folder1 or /folder2
3. move a node from either /folder1 to /folder2 or vice versa

On tearDown the workspace is checked for inconsistencies.

Another patch is for the ItemSaveOperation class which fixes the issue. It's a proposed solution
and I am not sure if this class is the right place to throw a StaleItemException or if there
is a better solution than this but it is a proof of concept at the least.

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