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From "Vu Le (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-5300) Inifinite loop when attempting to replay levelDB logs to rebuild index
Date Thu, 31 Jul 2014 03:49:38 GMT
Vu Le created AMQ-5300:
--------------------------

             Summary: Inifinite loop when attempting to replay levelDB logs to rebuild index
                 Key: AMQ-5300
                 URL: https://issues.apache.org/jira/browse/AMQ-5300
             Project: ActiveMQ
          Issue Type: Bug
          Components: activemq-leveldb-store
    Affects Versions: 5.10.0, 5.9.1
         Environment: Linux
            Reporter: Vu Le


While searching for a workaround for issue AMQ-5284, I came across this issue.

To work around the serialization issue (AMQ-5284), I deleted the index snapshots from the
LevelDB datastore. This will replay the logs to regenerate the index. However, if a log rotation
has already occurred, you will get an infinite loop upon restart.

Here are the steps to reproduce what I am seeing:

Configure ActiveMQ 5.10.0 to use a LevelDB data store with the log size of about 1MB.
{code}
<persistenceAdapter>
    <levelDB directory="${activemq.data}/leveldb" logSize="1000000" />
</persistenceAdapter>
{code}

Then I started up the broker and published 10,000 persistent messages to a queue, causing
the log files to rotate (twice in my case). I see the following files in the data store folder:
{code}
-rw-rw-r--. 1 user users 1000071 Jul 30 11:15 0000000000000000.log
-rw-rw-r--. 1 user users 1000009 Jul 30 11:16 00000000000f4287.log
drwxrwxr-x. 2 user users    4096 Jul 30 11:16 00000000001e84d0.index
-rw-rw-r--. 1 user users 1000000 Jul 30 11:17 00000000001e84d0.log
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 dirty.index
-rw-rw-r--. 1 user users       0 Jul 30 11:11 lock
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 plist.index
-rw-rw-r--. 1 user users      24 Jul 30 11:11 store-version.txt
{code}

I then consume 5,000 messages, which causes the first log to be deleted since it is no longer
being referenced. I see the following log statements:
{code}
2014-07-30 11:29:14,960 | DEBUG | Log no longer referenced: 0 | org.apache.activemq.leveldb.LevelDBClient
| Thread-2
2014-07-30 11:29:14,967 | DEBUG | Deleting log at 0 | org.apache.activemq.leveldb.LevelDBClient
| Thread-2
{code}

And I see the remaining files in the data store folder (notice the 0000000000000000.log is
gone):
{code}
-rw-rw-r--. 1 user users 1000009 Jul 30 11:16 00000000000f4287.log
-rw-rw-r--. 1 user users 1000011 Jul 30 11:29 00000000001e84d0.log
drwxrwxr-x. 2 user users    4096 Jul 30 11:29 00000000002dc71b.index
-rw-rw-r--. 1 user users 1000000 Jul 30 11:29 00000000002dc71b.log
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 dirty.index
-rw-rw-r--. 1 user users       0 Jul 30 11:11 lock
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 plist.index
-rw-rw-r--. 1 user users      24 Jul 30 11:11 store-version.txt
{code}

At this point, I shut down the broker and here is the listing of what's left in the data store:
{code}
-rw-rw-r--. 1 user users 1000009 Jul 30 11:16 00000000000f4287.log
-rw-rw-r--. 1 user users 1000011 Jul 30 11:29 00000000001e84d0.log
-rw-rw-r--. 1 user users 1000000 Jul 30 11:29 00000000002dc71b.log
drwxrwxr-x. 2 user users    4096 Jul 30 11:36 0000000000301737.index
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 dirty.index
drwxrwxr-x. 2 user users    4096 Jul 30 11:11 plist.index
-rw-rw-r--. 1 user users      24 Jul 30 11:11 store-version.txt
{code}

I then delete the index folder within the data store (in my case "0000000000301737.index").
I am doing this to force a replay of the logs to regenerate the index (due to the serialization
issue I ran into).

And finally, this is the message I am getting once I start the broker back up (infinite loop
of this same message, and I have to shut down the broker):

{code}
2014-07-30 11:40:27,415 | WARN  | No reader available for position: 0, log_infos: {1000071=LogInfo(/home/user/apache-activemq-5.10.0/data/leveldb/00000000000f4287.log,1000071,1000009),
2000080=LogInfo(/home/user/apache-activemq-5.10.0/data/leveldb/00000000001e84d0.log,2000080,1000011),
3000091=LogInfo(/home/user/apache-activemq-5.10.0/data/leveldb/00000000002dc71b.log,3000091,0)}
| org.apache.activemq.leveldb.RecordLog | main
{code}



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