Liyin Tang created HBASE-10502:
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Summary: [89-fb] ParallelScanner: a client utility to perform
multiple scan requests in parallel.
Key: HBASE-10502
URL: https://issues.apache.org/jira/browse/HBASE-10502
Project: HBase
Issue Type: New Feature
Reporter: Liyin Tang
Fix For: 0.89-fb
ParallelScanner is a utility class for the HBase client to perform multiple
scan requests in parallel. It requires all the scan requests having the same
caching size for the simplicity purpose.
This class provides 3 very basic functionalities:
* The initialize function will Initialize all the ResultScanners by calling
{@link HTable#getScanner(Scan)} in parallel for each scan request.
* The next function will call the corresponding {@link ResultScanner#next(int
numRows)} from each scan request in parallel, and then return all the results
together as a list. Also, if result list is empty, it indicates there is no
data left for all the scanners and the user can call {@link #close()}
afterwards.
* The close function will close all the scanners and shutdown the thread pool.
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