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From Yan Chunlu <springri...@gmail.com>
Subject how does compaction_throughput_kb_per_sec affect disk io?
Date Mon, 26 Sep 2011 12:40:18 GMT
I am using the default 16MB when running repair. but the disk io is still
quite high:

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz
avgqu-sz   await r_await w_await  svctm  %util
sdb             136.00     0.00  506.00   26.00 63430.00  5880.00   260.56
101.73  224.38    6.60 4462.62   1.88 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz
avgqu-sz   await r_await w_await  svctm  %util
sdb              58.50 21978.00  131.00  122.50 16226.00 52596.00   542.97
122.98  870.28   10.02 1790.24   3.94 100.00




the  rkB/s  and wKB/s are almost 60MB, did I misunderstand the meaning of
compaction throttle?


cassandra version is 0.8.6

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