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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1328) Hadoop Streaming needs to provide a way for the stream plugin to update global counters
Date Fri, 27 Jun 2008 19:51:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-1328:
------------------------------------

    Release Note: Introduced a way for a streaming process to update global counters and status
using stderr stream to emit information. Use "reporter:counter:<group>,<counter>,<amount>
" to update a counter. Use "reporter:status:<message>" to update status.  (was: Introduces
a way for the streaming process to update global counters and status. A streaming process
can use the stderr to emit counter information. reporter:counter:<group>,<counter>,<amount>
can be used to update a counter. And to set a status, reporter:status:<message> can
be used.)

> Hadoop Streaming needs to provide a way for the stream plugin to update global counters
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1328
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1328
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: contrib/streaming
>            Reporter: Runping Qi
>            Assignee: Tom White
>             Fix For: 0.18.0
>
>         Attachments: hadoop-1328-v2.patch, hadoop-1328-v3.patch, hadoop-1328-v4.patch,
hadoop-1328-v5.patch, hadoop-1328.patch
>
>
> Sometimes, the stream plugin may want to create/update its own global counters.
> There is no way to do so currently.
> One possible way to enable that is to use the stderr output of the stream process.
> The stream process can emit the global counter update information (such as GLOCAL_COUNTER
COUNTER_NAME NUM)
> to the stderr of the process. The Stderr handling thread can call the global counter
API whenever it encounters the global counter update information line.

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