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From Robert Coli <>
Subject Re: Minor Compactions Not Triggered
Date Tue, 02 Jun 2015 18:07:16 GMT
On Mon, Jun 1, 2015 at 11:25 AM, Anuj Wadehra <>

> As per the algorithm shared in the CASSANDRA 6654, I understand that
> tombstone_threshold property only comes into picture if you have expirying
> columns and it wont have any effect if you have manually deleted rows in
> cf. Is my understanding correct?
> According to you What would be the expected behavior of following steps??
> I inserted x rows
> I deleted x rows
> Ran major compaction to make sure that one big sstable contains all
> tombstones
> Waited for gc grace period to see whether that big sstable formed after
> major compaction is compacted on its own without finding any other sstable

That's a good question, and I don't actually know the answer. If you aren't
generating new SSTables in the CF via writes and flushes, I would doubt any
background process notices it's expired and re-compacts it.

Have you considered asking this question in the #cassandra IRC channel on


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