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Re: GC and High CPU - HBase - [mail # user]
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...Those are the lines I added: -XX:+CMSIncrementalMode \ wrote: log 3 3 3 3 3 log al e. say he off? te: e ll o is e gh o ote: e:gc that in on hdfs access)....
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Author: Jack Levin,
2011-05-17, 00:06
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Re: GC and High CPU - HBase - [mail # user]
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...I think this will resolve my issue, here is the output: 14 2011-05-16T15:58 13 2011-05-16T15:59 12 2011-05-16T16:00 ...
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Author: Jack Levin,
2011-05-16, 23:11
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Re: GC and High CPU - HBase - [mail # user]
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...hlog rolled, and qps was at 1000, not much at all. I tend to believe that concurrent GC collection is taking way too many threads from the app layer and causing CPU to run up. Se...
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Author: Jack Levin,
2011-05-16, 22:17
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Re: GC and High CPU - HBase - [mail # user]
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...How do you tell? This is the log entries when we had 100% cpu: 2011-05-14T15:48:58.240-0700: 5128.407: [GC 5128.407: [ParNew: 17723K->780K(19136K), 0.0199350 secs] 4309804K-&g...
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Author: Jack Levin,
2011-05-16, 20:36
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Re: Performance degrades on moving from desktop to blade environment - HBase - [mail # user]
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...What is the clock rate of your CPUs (desktop vs blade)? -Jack On Mon, May 16, 2011 at 1:24 PM, Himanish Kushary wrot e: at wrote: e e: Sun May 15 0 54 e: Sun May 15 0...
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Author: Jack Levin,
2011-05-16, 20:26
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Re: GC and High CPU - HBase - [mail # user]
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...There HEAP would be 8G used out of 12G total. The gc-log would be full of ParNew, no FULL GC at all, ParNew just starts at hight rate (10-15 lines per second). Even if you remove...
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Author: Jack Levin,
2011-05-16, 19:39
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Re: Performance degrades on moving from desktop to blade environment - HBase - [mail # user]
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...We had issues of moving into 32 core AMD box also. The issue was revolving around datanode getting slow after about 12 hours. What you need to do is check fsreadlatency_ave_time ...
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Author: Jack Levin,
2011-05-16, 19:35
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Re: Pagination through families / columns? - HBase - [mail # user]
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...When we change versions to 1 from 3 on hbase table schema, things appear work right. -Jack On Mon, May 16, 2011 at 12:14 PM, Jean-Daniel Cryans wrote: ly hack up the thrift...
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Author: Jack Levin,
2011-05-16, 19:23
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Re: GC and High CPU - HBase - [mail # user]
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...Somewhere like imageshack :) http://img221.imageshack.us/img221/761/screenshot20110515at537p.png -Jack On Sun, May 15, 2011 at 7:09 PM, Ted Yu wrote: ls 0 per...
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Author: Jack Levin,
2011-05-16, 02:49
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Re: GC and High CPU - HBase - [mail # user]
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...I've added occupancy: export HBASE_OPTS="$HBASE_OPTS -verbose:gc -XX:CMSInitiatingOccupancyFraction=70 -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+HeapDumpOnOutOfMemoryError -Xlogg...
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Author: Jack Levin,
2011-05-16, 00:37
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