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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7317) server-side request problems are hard to debug
Date Tue, 11 Dec 2012 01:02:09 GMT
Sergey Shelukhin created HBASE-7317:
---------------------------------------

             Summary: server-side request problems are hard to debug
                 Key: HBASE-7317
                 URL: https://issues.apache.org/jira/browse/HBASE-7317
             Project: HBase
          Issue Type: Brainstorming
          Components: IPC/RPC, regionserver
            Reporter: Sergey Shelukhin
            Priority: Minor



I've seen cases during integration tests where the write or read request took an unexpectedly
large amount of time (that, after the client went to the region server that is reported alive
and well, which I know from temporary debug logging :)), and it's impossible to understand
what is going on on the server side, short of catching the moment with jstack.

Some solutions (off by default) could be 
- a facility for tests (especially integration tests) that would trace Server/Master calls
into some log or file (won't help with internals but at least one could see what was actually
received);
- logging the progress of requests between components inside master/server (e.g. "request
id=N received", "request id=N is being processed in MyClass", N being drawn on client from
local sequence - no guarantees of uniqueness are necessary).


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