Mitch Shanklin created BEAM-840:
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Summary: Add Java SDK extension to support non-distributed sorting
Key: BEAM-840
URL: https://issues.apache.org/jira/browse/BEAM-840
Project: Beam
Issue Type: New Feature
Components: sdk-java-extensions
Affects Versions: 0.4.0-incubating
Reporter: Mitch Shanklin
Assignee: Mitch Shanklin
Priority: Minor
Add an extension that provides a PTransform which performs
local(non-distributed) sorting. It will sort in memory until the buffer is
full, then flush to disk and use external sorting.
Consumes a PCollection of KVs from primary key to iterable of secondary key and
value KVs and sorts the iterables. Would probably be called after a GroupByKey.
Uses coders to convert secondary keys and values into byte arrays and does a
lexicographical comparison on the secondary keys.
Uses Hadoop as an external sorting library.
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