Disable the commit log

[Charan Adabala]

Hi Friends,

Please help me how I disable the commit log in cassandra.

1) Is there any issues if I disable the commit log?

2) Is there any performance improvement ?

Actually I Goggled for disable the commit log but they says, when we creating the Keyspace set durable_writes = false, but this is not working for me I tried.

Please give the valuable suggestion's.

[Russell Spitzer]

Setting durable_writes to false on the keyspace will disable the commit log for writes to that table. 

Other tables will still have durable writes (like the system keyspace) There will be a considerable performance improvement since you will no longer put any pressure on the commit log and writes will be able go into the system and only touch the disk once when the meltable is flushed to disk. This comes at the cost of not having a copy written to hard storage on ack which means a power loss will lose records. 

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