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