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From Jonathan Ellis <>
Subject Re: GC Storm
Date Sun, 18 Jul 2010 12:40:47 GMT
On Sun, Jul 18, 2010 at 2:45 AM, Schubert Zhang <> wrote:
> In a heavy inserting (many client threads), the memtable flush (generate new
> sstable) is frequent (e.g. one in 30s).

This is a sign you should increase your memtable thresholds, btw.  If
you wrote out larger sstables, there would be less duplicate i/o
reading them back in to compact them back out.

> Question:
> (1) Can we modify the compaction policy, to compact the smaller sstables
> with high priority? even when there is/are larger-compaction runing.
> (2) Can we implement multi-thread compaction?

Isn't (1) a subset of (2)?

There is a ticket open for (2) at

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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