Eric Owhadi created TRAFODION-1420:
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Summary: Use ClientSmallScanner for small scans to improve
performance
Key: TRAFODION-1420
URL: https://issues.apache.org/jira/browse/TRAFODION-1420
Project: Apache Trafodion
Issue Type: Improvement
Components: sql-cmp, sql-exe
Reporter: Eric Owhadi
Fix For: 2.0-incubating
Hbase implements an optimization for small scan (defined as scanning less than
a data block ie 64Kb) resulting in 3X performance improvement. The underlying
trick is about cutting down RPC calls from 3 (OpenScan/Next/Close) to 1, and
use pread stateless instead of seek/read state-full and locking method to read
data. This JIRA is about improving the compiler who can be aware if a scan
will be acting on single data block (small) or not, and pass this data to
executor so that it can use the right parameter for scan.
(scan.setSmall(boolean)).
reference:
https://issues.apache.org/jira/browse/HBASE-9488
https://issues.apache.org/jira/browse/HBASE-7266
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