Question about evictor, application performance, and log growth

Hello,
I've got an application that using two BDB environments, one with critical data and one with data that can be reconstructed, just for the sake of backup convenience. For a while, I was getting OutOfMemoryErrors with increasing frequency. This caused the app to crash without closing the databases or the environment until the recovery time was around 30 minutes. After reading through many of the posts here and trying various workarounds, I got to a state where that stopped happening. I think that what did that fixed is was decreased the cache sizes.
Then, I was seeing what appeared to be evictor deadlocks. The application would hang for thirty minutes before a monitoring script that I've got would detect that no work was being done and would restart the application. Another round of searching ensued and I seem to have gotten it to a state where it doesn't run out of memory or deadlock anymore.
After getting rid of all these issues and letting it run for four or five days, the size of one of the critical BDB environment was 550GB. Since it was almost filling the drive, I moved it aside and created a new BDB for the app to use. Now, I'm trying to figure out what happened. It looks like the BDB contains about 15G of actual data.
It seems like everything starts out fine and then, somehow, it starts to collapse under the weight of itself. I'd like to figure out what type of abuse I may be guilty of that could cause this.
Here's a little bit about my application:
First (critical) BDB environment:
- add only, no deletes
- two databases
- average data sizes are 1k and 11k respectively
- average key sizes are around 80 and 16 bytes respectively
- almost no locality of reference to access pattern in either
- minimal lookups, mostly used as an archive
- cache size is 1MB
- 8 threads reading/writing, 40 threads reading only
Second (reconstructable) BDB environment:
- six databases
- five databases are mostly add with purges of two-week-old data
- one database has frequent adds and deletes
- lots of lookups, things are likely to be looked up shortly after they're added
- cache size is 64MB
- 40 threads reading/writing
On both environments,I've set je.evictor.forcedYield=true.
I'm running the JVM with:
-Xmx1800m
-Dje.adler32.chunkSize=8192
-XX:+UseMembar
JVM version is:
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Server VM (build 1.6.0_01-b06, mixed mode)
BDB version is 3.2.23
OS/Kernel is:
Linux app2 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:17:21 EST 2007 i686 i686 i386 GNU/Linux
So, my question is:
What could cause the critical database (especially with no deletes) to grow to 550GB when there's only 15GB of data in it? It was my understanding that the cleaner should take care of any unused log file cruft. It seems like the log files grow faster as the performance gets worse. I have no idea which is the cause or the effect.
And, I guess the real question is how can I prevent this in the future?
Thanks,
-Justin

For the record, the problem was that the user's cache size was too small for the size of the database thereby creating a large number of records in the log when eviction of dirty records occurred. The cleaner was unable to keep up with the log load.
Note to readers: eviction of dirty records causes records to be written to the log. JE has to evict to somewhere and the log is what it uses.
Charles Lamb

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