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From "Selcuk Aya (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DIRSERVER-1642) Unexpected behaviour in JdbmIndex
Date Thu, 25 Aug 2011 06:50:29 GMT

     [ https://issues.apache.org/jira/browse/DIRSERVER-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Selcuk Aya updated DIRSERVER-1642:
----------------------------------

    Attachment: jdbm1.diff

A basic working version for the jdbm versioned Btree.
SnapshotBtree: unit test for the versioned btree. Demonstrates consistent browsing actions
while tree is modified.

LRUCache:implements a versioned lru cache. As new versions are created, part of the cache
is used for storing previous versions of Btree pages. Concurrent read/write to a BPage is
synchronized here.

ActionContext.java, ActionVersioning.java: basically keeps track of the versionassigned to
the action. When client enters an action, its action context is stored in a thread local variable.
ActionVersioning keeps track of the next readwrite action version and the minimum read version.

BPage and BTree:as updates are done to a page, they are copied on write at thislevel. Also
browser keeps track of its action context.


> Unexpected behaviour in JdbmIndex
> ---------------------------------
>
>                 Key: DIRSERVER-1642
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-1642
>             Project: Directory ApacheDS
>          Issue Type: Bug
>            Reporter: Stefan Seelmann
>         Attachments: DIRSERVER-1642.patch, IndexTest.java, jdbm1.diff
>
>
> During my experiments and tests of removing one-level and sub-level indices at least
one integration test "SearchAuthorizationIT" failed (the test fails recursivelyDelete()).
A debugging session showed that the follwing:
> - in recursivelyDelete() multiple search requests are done which leads to multiple open
cursors in the XDBM search engine
> - an entry is deleted
> - when the open cursors are advanced wrong/unexpected entries are returned
> I was able to create a small test that shows the problem:
> - the index contains six tuples:
> (a,1)
> (b,2)
> (c,3)
> (d,4)
> (e,5)
> (f,6)
> - a cursor over the index is created and advanced two times, the expected tuples (a,1)
and (b,2) were returned
> - now tuple (c,3) is deleted
> - when the cursor is advanced again the tuple (b,2) is returned again! I had expected
(d,4).
> Note that this doesn't happen with AvlIndex.

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