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From "Jonathan Leavitt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6524) Hooks for hbase tracing
Date Thu, 20 Sep 2012 17:44:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459785#comment-13459785
] 

Jonathan Leavitt commented on HBASE-6524:
-----------------------------------------

bq. Doc is great. "(it would not be very difficult to remove this requirement)." What would
this take?
Well to remove the client addendum we would have to instrument the entry points into hbase.

I will try to find one good class to instrument as the entry point in to the system.  HTable.java
might work, but it doesn't include all operations, and importantly does not include all of
the steps of a 'get', bx getting the HTable is a big part, right? 
Maybe HTablePool.java would work. 

bq.  Can we do this for hdfs too yet? 
Not yet. I think Matt or Todd might be working on it. I have been looking into, but it does
require all of the additional instrumentation to HDFS. 

bq. What about an example that enables trace over hdfs too while the Get is going on?
I'm not sure what you mean by this. 

bq. On doc in general, I came across this recent quote "Documentation is like sex: when it
is good, it is very very good; and when it is bad, it is better than nothing."
Great quote. 
                
> Hooks for hbase tracing
> -----------------------
>
>                 Key: HBASE-6524
>                 URL: https://issues.apache.org/jira/browse/HBASE-6524
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Jonathan Leavitt
>            Assignee: Jonathan Leavitt
>             Fix For: 0.96.0
>
>         Attachments: 6524.addendum, 6524-v2.txt, 6524v3.txt, createTableTrace.png, hbase-6524.diff
>
>
> Includes the hooks that use [htrace|http://www.github.com/cloudera/htrace] library to
add dapper-like tracing to hbase.

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