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From Tim Bain <tbai...@gmail.com>
Subject Re: ActiveMQ ReplicatedLevelDB corruption
Date Fri, 23 Sep 2016 12:55:59 GMT
Just to confirm: your three brokers are writing their LevelDB files to
independent, separate disk locations, giving you three separate sets of
LevelDB files.  Right?

Is the original master's set of data files corrupted?  Or is it just the
two slaves for whom this happened?

On Sep 23, 2016 5:44 AM, "mlange" <mlange@anwb.nl> wrote:

> Recently I installed Apache ActiveMQ in a few different ways. One of those
> is
> using ReplicatedLevelDB for a master/slave/slave setup.
>
> Yesterday I did a bit of loadtesting: sending 100.000 messages with 100
> threads producing the messages (used jmeter for that) (so each thread
> produced 1000 messages); I had another process moving the messages from one
> broker to another and back again (the queues had the same names across each
> broker, so that was easy moving) and then went about processing the
> messages
> which caused the messages to flow across various queues.
>
> All seemed fine, everything looked okay... until I stopped the active
> broker. (this is hours after the last message was consumed and procsesed):
>
> Then I notice a few bouncing brokers, one comes up but crashes on an
> EOFException; a bit later the other broker does the same.
>
> In the log I see many messages like this:
>
> [quote]
> 2016-09-23 13:38:52,950 | WARN  | No reader available for position: 0,
> log_infos:
> {11534500540=LogInfo(/data/activemq/broker1-db/00000002af8282bc.log,
> 11534500540,104858130),
> 12163654223=LogInfo(/data/activemq/broker1-db/00000002d502a24f.log,
> 12163654223,104858162),
> 12897666570=LogInfo(/data/activemq/broker1-db/0000000300c2c60a.log,
> 12897666570,104859912),
> 13002526482=LogInfo(/data/activemq/broker1-db/000000030702cf12.log,
> 13002526482,104859038),
> 18455209795=LogInfo(/data/activemq/broker1-db/000000044c042743.log,
> 18455209795,104859837),
> 22020442500=LogInfo(/data/activemq/broker1-db/0000000520854984.log,
> 22020442500,104859288),
> 23173898306=LogInfo(/data/activemq/broker1-db/000000056545a042.log,
> 23173898306,104860684),
> 24641928389=LogInfo(/data/activemq/broker1-db/00000005bcc5fcc5.log,
> 24641928389,0)}
> | org.apache.activemq.leveldb.RecordLog | Thread-1039
> [/quote]
>
> Then I see messages like this:
> [quote]
> 2016-09-23 13:38:46,324 | WARN  | Invalid log position: 11409726550 |
> org.apache.activemq.leveldb.LevelDBClient | ActiveMQ
> BrokerService[broker1]
> Task-3
> [/quote]
>
> After that, the broker starts and logs a few messages like this:
> [quote]
> 2016-09-23 13:40:49,041 | WARN  | Invalid log position: 0 |
> org.apache.activemq.leveldb.LevelDBClient | Thread-1040
> [/quote]
>
> and then we get exception:
> [quote]
> 2016-09-23 13:41:09,748 | INFO  | Stopping BrokerService[broker1] due to
> exception, java.io.EOFException: File
> '/data/activemq/broker1-db/000000030702cf12.log' offset: 110647192 |
> org.apache.activemq.util.DefaultIOExceptionHandler | LevelDB IOException
> handler.
> java.io.EOFException: File '/data/activemq/broker1-db/
> 000000030702cf12.log'
> offset: 110647192
> [/quote]
>
> This is a rince and repeat situation; both living brokers are now
> alternating this sequence.
>
> It seems like the load I generated caused corruption on the database; but
> this should not be possible... What information can I provide to see how
> this situation can be avoided?
>
>
>
> --
> View this message in context: http://activemq.2283324.n4.
> nabble.com/ActiveMQ-ReplicatedLevelDB-corruption-tp4716831.html
> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>

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