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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7317) server-side request problems are hard to debug
Date Wed, 12 Dec 2012 17:58:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13530153#comment-13530153
] 

Andrew Purtell commented on HBASE-7317:
---------------------------------------

bq. Fair point

We could also go in the other direction, reach out to Jon for a grant to "port to Apache"
as Sergey said, and then carry it forward maintained in tree. It would need a sponsor, and
work to make it useful along the lines that Todd and you suggest. Do we have that is the question.
                
> 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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