Job completion notification to a job configured URL
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Key: HADOOP-1111
URL: https://issues.apache.org/jira/browse/HADOOP-1111
Project: Hadoop
Issue Type: New Feature
Components: mapred
Affects Versions: 0.12.0
Environment: all
Reporter: Alejandro Abdelnur
Currently clients have to poll the JobTracker to find if a job has completed or
not.
When invoking Hadoop from other systems is desirable to have a notification
mechanism on job completion.
The notification approach simplifies the client waiting for completion and
removes load from the JobTracker as polling can be avoided.
Proposed solution:
When the JobTracker processes the completion of a job (success and failure) if
the job configuration has a jobEnd.notificationUrl property it will make a HTTP
GET request to the specified URL.
The jobEnd.notificationUrl property may include 2 variables in it '${jobId}'
and '${jobStatus}'. if they are present, they will be replaced with tehe job ID
and status of the job and the URL will be invoked.
Two additional properties, 'jobEnd.retries' and 'jobEnd.retryInterval', will
indicate retry behavior.
Not to delay the JobTracker processing while doing notifications, a
ConsumerProducer Queue will be used to queue up job notification upon
completion.
A daemon thread will consume job notifications from the above Queue and will
make the URL invocation.
On notification failure, the job notification is queue up again on the
notification queue.
The queue will be a java.util.concurrent.DelayQueue. This will make job
notifications (on retries) to be avaiable on the consumer side only when the
retry time is up.
The changes will be done in the JobTracker and in the LocalJobRunner.
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