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From "Doug Meil (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5301) Some RegionServer metrics have really confusing names
Date Mon, 30 Jan 2012 20:39:13 GMT
Some RegionServer metrics have really confusing names

                 Key: HBASE-5301
                 URL: https://issues.apache.org/jira/browse/HBASE-5301
             Project: HBase
          Issue Type: Bug
            Reporter: Doug Meil

Mikael Sitruk commented on this back in Nov 2011 and after looking at this I completely agree
with him.  For example, "flushSize_avg_time" makes no sense.  "flushSize" is in bytes, so
is this the average flush size?  Or the average time per flush?  In which case, why not call
the measure "flush_avg_time".  But to add to the confusion there is already a "flushTime_avg_time"
metric.  There is also "flushTime_num_ops" and "flushSize_num_ops" that are confusing.  Is
the former the number of flushes?  In which case, why have "time" in the metric name?  

On 11/22/11 5:23 PM, "Mikael Sitruk" <mikael.sitruk@gmail.com> wrote:


I have enabled metrics on Hbase cluster (0.90.1), and mapped the metrics
3 categories (missing, Present but not documented/Incomplete
documentation,Ok) according to their status in the book (
http://hbase.apache.org/book.html#hbase_metrics). Is it possible to udpate
the book accordingly?
It seems also that rpc metrics are not documented at all.

And now some questions on the metrics:
I can see some metrics present a num_ops and avg_time suffix (like rpc)
it seems that for certain metrics is it totally unclear (to me at least)
their name is missleading - for example what
means compactionTime_avg_time/compactionTime_num_ops? or
and flushSize_num_ops? I mean I would have understood compaction_avg_time
and flushSize or flush_avg_time.

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