Hi guys, I am having a difficult time getting the log compaction to run on a 
topic I created initially with cleanup.policy=delete. Here's the details:

3 brokers, 0.8.1.1 all have log.cleaner.enable=true (other than this there are 
no non-defaults set in our server.properties)

Create the topic first with policy=delete and a short window. Wanted to see 
that the segments were being created and deleted by the "normal" delete 
retention. This seemed to work fine. New segments created every 6 seconds while 
I add some test data, then the cleaner comes along and deletes log segments 
after 1min.

sudo bin/kafka-topics.sh --zookeeper zk1:2181/kafka --create --topic 
dev_testcompact --partitions 10 --replication-factor 3 --config 
cleanup.policy=delete --config segment.ms=6000 --config retention.ms=60000


Then I tried to update the policy to do compact:
sudo bin/kafka-topics.sh --zookeeper zk1:2181/kafka --alter --topic 
dev_testcompact --config cleanup.policy=compact --config 
min.cleanable.dirty.ratio=0.3 -config delete.retention.ms=60000

>From this point, the deletion retention stopped cleaning up, but the compact 
>cleaner doesn't seem to be running at all. I was expecting that after 15 
>seconds (default for setting log.cleaner.backoff.ms) the cleaner would come in 
>and compact the old segments. I now have generated 400 rows across 40 keys (so 
>there is plenty to compact). Segments are being created every 6 seconds per 
>the config.

I have also tried removing the deletion related config:

sudo bin/kafka-topics.sh --zookeeper zk1:2181/kafka --alter --topic 
dev_testcompact --deleteConfig retention.ms

I then restarted one of the three brokers wondering if it needed to restart to 
pick up new configs, still no clenup. What am I doing wrong?!

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