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Date: Mon, 19 Mar 2012 08:13:41 +0000 (UTC)
From: "Thomas Mueller (Commented) (JIRA)" <jira@apache.org>
To: dev@jackrabbit.apache.org
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Subject: [jira] [Commented] (JCR-3261) Problems with
 BundleDbPersistenceManager getAllNodeIds
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    [ https://issues.apache.org/jira/browse/JCR-3261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232498#comment-13232498 ] 

Thomas Mueller commented on JCR-3261:
-------------------------------------

What is your use case, that is, why do you need getAllNodeIds? I'm just wondering if we really need this method... If we could remove it then we wouldn't have to deal with such problems.
                
> Problems with BundleDbPersistenceManager getAllNodeIds
> ------------------------------------------------------
>
>                 Key: JCR-3261
>                 URL: https://issues.apache.org/jira/browse/JCR-3261
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>    Affects Versions: 2.4
>            Reporter: Unico Hommes
>             Fix For: 2.4.1
>
>         Attachments: bdbpm_allids.patch
>
>
> When using MySQL:
> The problem arises when the method parameter maxcount is less than the total amount of records in the bundle table.
> First of all I found out that mysql orders the nodeid objects different than jackrabbit does. The following test describes this idea:
>     public void testMySQLOrderByNodeId() throws Exception {
>         NodeId nodeId1 = new NodeId("7ff9e87c-f87f-4d35-9d61-2e298e56ac37");
>         NodeId nodeId2 = new NodeId("9fd0d452-b5d0-426b-8a0f-bef830ba0495");
>         PreparedStatement stmt = connection.prepareStatement("SELECT NODE_ID FROM DEFAULT_BUNDLE WHERE NODE_ID = ? OR NODE_ID = ? ORDER BY NODE_ID");
>         Object[] params = new Object[] { nodeId1.getRawBytes(), nodeId2.getRawBytes() };
>         stmt.setObject(1, params[0]);
>         stmt.setObject(2, params[1]);
>         ArrayList<NodeId> nodeIds = new ArrayList<NodeId>();
>         ResultSet resultSet = stmt.executeQuery();
>         while(resultSet.next()) {
>             NodeId nodeId = new NodeId(resultSet.getBytes(1));
>             System.out.println(nodeId);
>             nodeIds.add(nodeId);
>         }
>         Collections.sort(nodeIds);
>         for (NodeId nodeId : nodeIds) {
>             System.out.println(nodeId);
>         }
>     }
> Which results in the following output:
> 7ff9e87c-f87f-4d35-9d61-2e298e56ac37
> 9fd0d452-b5d0-426b-8a0f-bef830ba0495
> 9fd0d452-b5d0-426b-8a0f-bef830ba0495
> 7ff9e87c-f87f-4d35-9d61-2e298e56ac37
> Now the problem with the getAllNodeIds method is that it fetches an extra 10 records on top of maxcount (to avoid a problem where the first key is not the one you that is wanted). Afterwards it skips a number of records again, this time using nodeid.compareto. This compareto statement returns true unexpectedly for mysql because the code doesn't expect the mysql ordering.
> I had the situation where I had about 17000 records in the bundle table but consecutively getting the ids a thousand records at a time returned only about 8000 records in all.

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