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https://issues.apache.org/jira/browse/PIG-626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shubham Chopra updated PIG-626:
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Attachment: pigStats.patch
1. The initial goal is to just get the pig query result sizes. I try to get the
no. of records written by the last job which gives me the required metric. In
addition to this I am making the stats for all the jobs available. I am not
adding any specific stat to map/reduce.
2. I am only using the hadoop counters here. I am not registering any
pig-specific counters. Olga had suggested that I make the counters available in
the form of a map with the keys starting with PIG_STATS to reference the
required counter.
Hadoop has a bunch of counters that it uses to display stats in its map-red
webUI. These counters give the no. of records and bytes read/written by
map/reduce of each job. I am making all the hadoop stats, at the granularity of
a record, available.
3. I have rectified this in the new patch.
4. These counters are incremented within hadoop.
> Statistics (records read by each mapper and reducer)
> ----------------------------------------------------
>
> Key: PIG-626
> URL: https://issues.apache.org/jira/browse/PIG-626
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Affects Versions: types_branch
> Reporter: Shubham Chopra
> Priority: Minor
> Attachments: pigStats.patch, pigStats.patch
>
>
> This uses the counters framework that hadoop has. Initially, I am just
> interested in finding out the number of records read by each mapper/reducer
> particularly for the last job in any script. A sample code to access the
> statistics for the last job:
> String reducePlan =
> stats.getPigStats().get(stats.getLastJobID()).get("PIG_STATS_REDUCE_PLAN");
> if(reducePlan == null) {
> System.out.println("Records written : " +
> stats.getPigStats().get(stats.getLastJobID()).get("PIG_STATS_MAP_OUTPUT_RECORDS"));
> } else {
> System.out.println("Records written : " +
> stats.getPigStats().get(stats.getLastJobID()).get("PIG_STATS_REDUCE_OUTPUT_RECORDS"));
> }
> The patch contains 7 test cases. These include tests PigStorage and
> BinStorage along with one for multiple MR jobs case.
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