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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7317) consider "full-featured" support for HTrace for HBase debugging
Date Fri, 11 Jan 2013 18:36:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551365#comment-13551365

Sergey Shelukhin commented on HBASE-7317:

I will probably take a look into this, but not soon...
> consider "full-featured" support for HTrace for HBase debugging
> ---------------------------------------------------------------
>                 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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