Gopal V created TEZ-1593:
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Summary: PipelinedSorter::compare() makes a key-copy to satisfy
RawComparator interface
Key: TEZ-1593
URL: https://issues.apache.org/jira/browse/TEZ-1593
Project: Apache Tez
Issue Type: Bug
Affects Versions: 0.6.0
Reporter: Gopal V
Assignee: Gopal V
The current implementation of PipelinedSorter has a slow section which revolves
around key comparisons.
{code}
kvbuffer.position(istart);
kvbuffer.get(ki, 0, ilen);
kvbuffer.position(jstart);
kvbuffer.get(kj, 0, jlen);
// sort by key
final int cmp = comparator.compare(ki, 0, ilen, kj, 0, jlen);
{code}
The kvbuffer.get into the arrays ki and kj are the slowest part of the
comparator operation.
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