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From "Yi Deng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11046) New Scanner API
Date Mon, 21 Apr 2014 19:42:15 GMT
Yi Deng created HBASE-11046:
-------------------------------

             Summary: New Scanner API
                 Key: HBASE-11046
                 URL: https://issues.apache.org/jira/browse/HBASE-11046
             Project: HBase
          Issue Type: New Feature
          Components: Scanners
            Reporter: Yi Deng
             Fix For: 0.89-fb


A new scanner API for reducing unnecessary RPC calls:
Motivation:
# RPC is expensive to both client and server.
# The most important function for scanning is getting data, but for each scanning process
within a region, there are 3 times of RPC that doesn't transfer data: open, last next, and
close, I want to remove them all (for most of the situation)
Solution:
# a new scanner API (scannerOpen) which has an option of transfer data along with the scannerID
back in this call
# a new scanner API (scannerNext) which is similar to current next, but returns flags of whether
more data is available and whether need to scan next region. If no data left, automatically
close the scanner.
# the current scannerClose is still useful when you want to close the scanner before reach
the end.



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