CODEWITHSUNDEEP
cassandratombstone
sorabh
sorabh

Reputation: 327

standalone compaction in cassandra

I am fairly new to Cassandra, so plz excuse if you find this question not worthy.

I am trying to test the behavior of my cassandra(1.2.5) cluster, for that i have set my column ttl to be 1 day. After a day i was able to confirm the data being not available, but i want to verify that standalone compaction is happening and cleaning the space occupied by tombstones when i am using default tombstone_threshold i.e 20%.

So my question is - How to make sure Stand alone compaction is happening? and is there a way to know how much size disk space is freed in the process. Is there any logs reading about the compaction type and the work done by compaction?

Upvotes: 2

Views: 190

Answers (1)

Lyuben Todorov
Lyuben Todorov

Reputation: 14163

If you insert a little data (im talking 5-10 rows) it will be very easy to track whats going on via the sstable2json tool which gives you a 'raw' view of what an sstable stores. For detailed statistics about the ks/cf use nodetool status where you can see each node's load. 

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens  Owns (effective)  Host ID         Rack
UN  127.0.0.1  90.87 KB   256     100.0%            a0a2...22ff     rack1

Upvotes: 1

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