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From "Dan Hendry" <dan.hendry.j...@gmail.com>
Subject RE: Compaction threshold does not save with nodetool
Date Wed, 06 Apr 2011 14:36:55 GMT
There are two layers of settings, the default, cluster wide, settings part
of the schema and exposed/modifiable via the cli and individual settings
exposed/modifiable via JMX and nodetool. Using nodetool, you are only
modifying the in memory settings for a single node, changes to those
settings are not persisted or reflected in other nodes.

 

If you want a particular setting to be persisted across a restart (and
applied to other nodes when they restart), you have to use the cli and the
'update column family X with min_compaction_threshold=Y and
max_compaction_threshold=X' command.

 

Dan

 

From: Sheng Chen [mailto:chensheng2010@gmail.com] 
Sent: April-06-11 1:42
To: user@cassandra.apache.org
Subject: Compaction threshold does not save with nodetool

 

Cassandra 0.7.4

 

# nodetool -h localhost getcompactionthreshold Keyspace1 Standard1

min=4 max=32

# nodetool -h localhost setcompactionthreshold Keyspace1 Standard1 0 0

# nodetool -h localhost getcompactionthreshold Keyspace1 Standard1

min=0 max=0

 

Now the thresholds have changed on the JMX pannel, but in the cassandra-cli
`show keyspaces`, it is still  4/32.

After I restart cassandra, threshold by nodetool shows 4/32 again. The
setting is lost.

I tried to use nodetool flush to save the change but it doesn't work.

 

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