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From "Elek, Marton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDDS-1017) Use distributed tracing the indentify performance problems in Ozone
Date Mon, 28 Jan 2019 12:52:00 GMT
Elek, Marton created HDDS-1017:

             Summary: Use distributed tracing the indentify performance problems in Ozone
                 Key: HDDS-1017
                 URL: https://issues.apache.org/jira/browse/HDDS-1017
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
            Reporter: Elek, Marton
            Assignee: Elek, Marton

In the recent months multiple performance issues are resolved in OM/SCM and datanode sides.
To identify the remaining problems a distributed tracing framework would help a lot.

In HADOOP-15566 there is an ongoing discussion to remove the discontinued HTrace and use something
else instead. Until now without any conclusion, but

 1). There is one existing poc in the jira which uses opentracing
 2). It was suggested to "evaluating all the options" before a final decision 

As an evaluation step we would like to investigate the performance of ozone components with
opentracing. This patch can help us to find the performance problem but can be reverted when
we will have a final solution in HADOOP-15566 about the common tracing library.

To make it lightweight we can use the ozone message level tracing identifier for context propagation
instead of modifying the existing hadoop rpc framework. 

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