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From Henry Luo <>
Subject Hundreds compaction a day, is it normal?
Date Thu, 14 Oct 2010 20:23:35 GMT
We have a five node cluster, using replication factor of 3.  The application is only sending
write requests at this point - we'd like to gain some operation experience with it first before
start read from it.

We are seeing over a hundred compaction activities on each server, some of them are for HintsColumnFamily.

Each machine has 32 GB memory, two disk arrays, one with raid 0 for commit log, one with raid
5 for data. We are using version 0.6.1, and pretty much the out of the box storage.xml.

Is this normal? Where should we look for tuning?

Here is the ring info

Address       Status     Load          Range                                      Ring
                                       103348149328693428942388257816272166328  Up         136.41 GB     62116456964768051843784433654721163092     |<--|  Up         136.31 GB     82105179051854269619799333828977372565     |   ^  Up         152.77 GB     92197953251627500070365755299174650936     v   |  Up         71.38 GB      102264937228017528105060257264614100661    |   ^  Up         24.8 GB       103348149328693428942388257816272166328    |-->|


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