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Re: 0.90.3 - HBase - [mail # user]
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...looks like our balancer is on: hbase(main):001:0> balance_switch true true 0 row(s) in 0.3700 seconds I simply kill PID for RS, and it stays on the list with regions assigned,...
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Author: Jack Levin,
2011-05-24, 22:50
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0.90.3 - HBase - [mail # user]
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...just put new hbase version on our test cluster. and been testing it... so far if I shutdown an RS, master does not reassign its regions, and we remain inconsistent forerver, likewise when ne...
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Author: Jack Levin,
2011-05-24, 22:33
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Re: hbase master retries to RS/DN - HBase - [mail # user]
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...I am pretty sure this is related to https://issues.apache.org/jira/browse/HBASE-3285, a datanode is dead, but master tries to create a pipeline to it, when splitting logs. I will be up...
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Author: Jack Levin,
2011-05-21, 19:22
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Re: hbase master retries to RS/DN - HBase - [mail # user]
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...Thanks, now with setting that value to "2", we still get slow DN death master recovery of logs: 2011-05-19 23:34:55,109 WARN org.apache.hadoop.hdfs.DFSClient: Failed recovery attempt #...
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Author: Jack Levin,
2011-05-20, 06:36
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Re: GC and High CPU - HBase - [mail # user]
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...so far its going well, no more crazy GC, while load remains the same. 2011-05-18T11:01:53.149-0700: 52288.388: [CMS-concurrent-preclean: 5.764/216.720 secs] [Times: user=103.71 sys=15...
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Author: Jack Levin,
2011-05-19, 22:46
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Re: Performance degrades on moving from desktop to blade environment - HBase - [mail # user]
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...Himanish, it hard to say without trend graphs. Setup ganglia and get fsreadlatancy, as well as thread count graphs to see what the issue might be. -Jack On Thu, May 19, 201...
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Author: Jack Levin,
2011-05-19, 18:50
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hbase master retries to RS/DN - HBase - [mail # user]
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...Hello, we have a situation when when RS/DN crashes hard, master is very slow to recover, we notice that it waits on these log lines: 2011-05-19 11:20:57,766 INFO org.apache.hadoop.ipc.Client...
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Author: Jack Levin,
2011-05-19, 18:46
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Re: GC and High CPU - HBase - [mail # user]
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...Well, our issue was that we take an 8 core box, doing 18MB ParNew GC, do it super fast (10x1sec), receive RPC calls to RS at the same time, pile them up due to CPU contention, do GC even fas...
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Author: Jack Levin,
2011-05-18, 00:09
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Re: GC and High CPU - HBase - [mail # user]
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...This is the way I read it. "Low processors" == "high CPU tasks, e.g. high load". So, Incremental takes GC down a number of notches when it comes to competing with CPU for APP threads....
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Author: Jack Levin,
2011-05-17, 04:55
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Re: GC and High CPU - HBase - [mail # user]
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...I think in our case we have a deadlock of not cleaning garbage in large enough chunks; being stuck in high cpu is as good as being dead Jack On May 16, 2011 4:41 PM, "Andre...
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Author: Jack Levin,
2011-05-17, 03:30
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