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https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriel Reid updated CRUNCH-51:
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Attachment: SortTest.java
Here's the test case(s) that I was using to detect issues with descending
sorting and various Avro variants (sorry for not posting this in the first
place). The input file I was using (words) is just a copy of the word
dictionary in /usr/share/dict on my machine. Also, important to note, I was
running this using a pseudo-distributed cluster (i.e. not the local runner).
I didn't spot any clear errors when running into the crashes with Avro data,
but the fact that I'm getting a "Number of keys to write in partition file:0"
seems pretty suspect to me.
If you'd like, I can take a stab at figuring out what's going on here later on
today or tomorrow as well.
> PCollection#sort relies on using a single reducer for total order sorting
> -------------------------------------------------------------------------
>
> Key: CRUNCH-51
> URL: https://issues.apache.org/jira/browse/CRUNCH-51
> Project: Crunch
> Issue Type: Improvement
> Affects Versions: 0.3.0
> Reporter: Gabriel Reid
> Attachments: 0001-CRUNCH-51-Total-Order-Sort.patch, CRUNCH-51.patch,
> CRUNCH-51.patch, SortTest.java
>
>
> The total-order sorting provided by the Sort class (and therefore
> PCollection#sort) relies on using a single reducer in order to provide
> total-order sorting. This is very inefficient for large datasets, and should
> be replaced with a total order partitioner instead.
> For more information, see CRUNCH-23 (and possibly also MAPREDUCE-4574).
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