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From "volker.seibt" <>
Subject KahaDB journals growing - no visible entries
Date Wed, 11 Dec 2013 10:03:10 GMT
We use ActiveMQ 5.7 as embedded jms provider with camel 2.11.0.

It's a small application which uses about seven or eight queues with about
max. 1,000 small messages (tickets from a deposit machine) per queue / day.

We use persistent queues via KahaDB and did not change any KahaDB

With this the number of KahaDB journals (db-xxx.log) is growing every day.
>From 2013/07 until now we got 439 files with the default size of 32mb, which
cumulates to about 12 gb.

I copied this database to a standale ActiveMQ instance to analyze it:

On startup an automatic recovery is startet which "recovers" 5,400,000 (!)
entries. All queues used by our application are shown with zero
entries except the ActiveMQ.DLQ (dead letter queue) with 77 entries.

There are also about four or three topics shown with maximum 7 entries.

While running this database on an ActiveMQ instance for 10 minutes it grows
by three new files (about 95 mb).

First questions: where do the 5.4 million of entries hide? How can I get rid
of them without without a complete deletion of the database? How can such a
state occure, and more important, how can we avoid this?

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