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https://issues.apache.org/jira/browse/JCR-1092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shaun Barriball updated JCR-1092:
---------------------------------
Attachment: works.xml
> Bundle persistence managers node id key store/load is not symertric on MySql
> 5.0.* / JDBC driver 5.0.* causing NoSuchItemState Exceptions
> ------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: JCR-1092
> URL: https://issues.apache.org/jira/browse/JCR-1092
> Project: Jackrabbit
> Issue Type: Bug
> Components: sql
> Affects Versions: 1.3.1
> Environment: Mysql 5.0.45 / mysql-connector-java-5.0.6-bin.jar / Sun
> JDK 1.5 / Redhat Enterprise Linux 4
> Reporter: Shaun Barriball
> Attachments: causes_corruption.xml, works.xml
>
>
> It looks like the binary values read back from MySql where the UUID contains
> 0's is not the same as that generated from the UUID getRawBytes() call. As
> result, you can store a node with the UUID that has 0's but its never found
> when read back. This therefore causes corruption in random places when
> certain UUIDs are generated.
> Test Case:
> I've attached 2 files. One causes node corruption when imported, the other
> does not.
> The only difference is that I removed any 0 values from the problem UUID in
> the file that causes corruption.
> As Stefan pointed out, I had manipulated the test case to use standard nt
> types when in fact I should have provided the following info (sorry Stefan)
> e.g. the test folder types are referencable hence the jcr:uuid allocation
> [acme:Folder] > nt:folder, mix:referenceable
> If I import causes_corruption.xml and then attempt to "ls"
> AclObjectIdentities then loadBundle() returns null for the UUID
> a55f3f6b-a909-4e8d-b65a-93002ced0920 which in bytes is [-91, 95, 63, 107,
> -87, 9, 78, -115, -74, 90, -109, 0, 44, -19, 9, 32]
> If I import works.xml then "ls" works fine for the same node as I've manually
> changed the UUID to replace 0s with 1s in the last section.
> a55f3f6b-a909-4e8d-b65a-93112ced1921 [-91, 95, 63, 107, -87, 9, 78, -115,
> -74, 90, -109, 17, 44, -19, 25, 33]
> Testing shows this issue highlights a problem with the Bundle persistence
> manager and MySqls method of handling BINARY columns.
> The solution looks to be to replace BINARY(16) with VARBINARY(16). Quoting
> from http://dev.mysql.com/doc/refman/5.0/en/binary-varbinary.html...
> "If the value retrieved must be the same as the value specified for storage
> with no padding, it might be preferable to use VARBINARY or one of the BLOB
> data types instead."
> A review of our logs shows that all of the corruption we've seen has related
> to nodes with UUIDs including 0's.
> * Shall I log a JIRA ticket for this?
> * Anyone see any issues with this fix?
> In the following example you can see I'm showing all bundles in the "test1"
> workspace.
> mysql> select hex(node_id) from test1_bundle;
> +----------------------------------+
> | hex(node_id) |
> +----------------------------------+
> | 28126C3E36A0471D9CDC5AC423BAC9C5 |
> | A55F3F6BA9094E8DB65A93002CED0920 |
> | CAFEBABECAFEBABECAFEBABECAFEBABE |
> | D638EACCDEB641FD8868804C8ECEFFFD |
> | DEADBEEFCAFEBABECAFEBABECAFEBABE |
> +----------------------------------+
> 5 rows in set (0.00 sec)
> ...but a select using the same UUID hex value returns no rows.
> mysql> select node_id from test1_bundle where
> mysql> unhex('A55F3F6BA9094E8DB65A93002CED0920') = node_id;
> Empty set (0.00 sec)
> I've then created a new "test3" workspace which I modified to use varbinary
> instead of binary with:
> alter table test3_bundle modify NODE_ID varbinary(16); alter table test3_refs
> modify NODE_ID varbinary(16);
> My import test case now no longer fails and the following query proves that
> query operations, after a store, return rows as expected.
> mysql> select node_id from test3_bundle where
> mysql> unhex('A55F3F6BA9094E8DB65A93002CED0920') = node_id;
> +------------------+
> | node_id |
> +--------¶Z ,í-- |
> +------------------+
> 1 row in set (0.00 sec)
> mysql> desc test3_bundle;
> ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to
> reconnect...
> Connection id: 7116
> Current database: mmptest
> +-------------+---------------+------+-----+---------+-------+
> | Field | Type | Null | Key | Default | Extra |
> +-------------+---------------+------+-----+---------+-------+
> | NODE_ID | varbinary(16) | YES | UNI | NULL | |
> | BUNDLE_DATA | longblob | NO | | | |
> +-------------+---------------+------+-----+---------+-------+
> 2 rows in set (0.00 sec)
> mysql> alter table test3_bundle modify NODE_ID varbinary(16);
> Query OK, 2 rows affected (0.00 sec)
> Records: 2 Duplicates: 0 Warnings: 0
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