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[HBASE-7715] FSUtils#waitOnSafeMode can incorrectly loop on standby NN - HBase - [issue]
...We encountered an issue where HMaster failed to start with an active NN not in safe mode and a standby NN in safemode. The relevant lines in FSUtils.java show the issue:    wh...
http://issues.apache.org/jira/browse/HBASE-7715    Author: Andrew Wang, 2013-01-31, 07:53
[HBASE-6261] Better approximate high-percentile percentile latency metrics - HBase - [issue]
...The existing reservoir-sampling based latency metrics in HBase are not well-suited for providing accurate estimates of high-percentile (e.g. 90th, 95th, or 99th) latency. This is a well-stud...
http://issues.apache.org/jira/browse/HBASE-6261    Author: Andrew Wang, 2012-12-28, 15:22
Re: Metrics in 0.96 - HBase - [mail # dev]
...I think Elliot's concern with the histogram improvements is that if it goes in hadoop-common, HBase is only going to get it after it gets rolled into a new hadoop-common release and HBase bu...
   Author: Andrew Wang, 2012-06-30, 00:41
Re: high-percentile latency metrics, aka HBASE-6261 - HBase - [mail # dev]
...I put this on the jira too, but the algo I found whittled down a stream of 10 million items down to ~19.5k samples. With each sample at ~36B, that's ~685KiB. There's a bit more from using a ...
   Author: Andrew Wang, 2012-06-28, 22:53
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