Durable Writes in Cassandra

Question

While creating a Keyspace, sometimes I see a parameter: Durable Writes. Can anyone explain the significance of this parameter?

Answer 1

Durable Writes provides a means to instruct Cassandra whether to use "commitlog" for updates on the current KeySpace or not. This option is not mandatory. The default value for durable writes is TRUE.

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Answer 2

When Cassandra write:

1. memtable (in memory)

2. commit log (In persistence storage) before writing into, to safeguard the data, just incase of system restart.

   SSTABLE. (In persistence storage)

So, using "durable writes" it make sure the insert/update must write in commit log so the safeguard stay in place.