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From Tyler Hobbs <>
Subject Re: Cassandra disk usage and failure recovery
Date Tue, 04 Jan 2011 18:47:48 GMT
> Anti-compaction and streaming is done to move data from nodes that
> have it (that are in the replica set). This implies CPU and I/O and
> networking load on the source node, so it does have an impact. See
> among others.
> (Here's where I'm not sure, someone please confirm/deny) In 0.6, I
> believe this required diskspace on the originating node. In 0.7, I
> *think* the need for disk space on the source node is removed.

That is correct.  In 0.6, an anticompaction was performed and a temporary
SSTable was written out to disk, then streamed to the recipient.  The way
this is now done in 0.7 requires no extra disk space on the source node.

- Tyler

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