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MAPREDUCE-6063. Correct spill size calculation for spills wrapping the circular buffer. Contributed by zhihai xu.

This commit is contained in:
Chris Douglas 2014-09-03 14:32:35 -07:00
parent a7d8ede309
commit 69ee11dc93
2 changed files with 4 additions and 3 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
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@ -118,6 +118,9 @@ Release 2.6.0 - UNRELEASED
MAPREDUCE-5931. Validate SleepJob command line parameters (Gera Shegalov
via jlowe)
MAPREDUCE-6063. Correct spill size calculation for spills wrapping the
circular buffer. (zhihai xu via cdouglas)
Release 2.5.1 - UNRELEASED
INCOMPATIBLE CHANGES

4
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java
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@ -1575,9 +1575,7 @@ public class MapTask extends Task {
InterruptedException {
//approximate the length of the output file to be the length of the
//buffer + header lengths for the partitions
final long size = (bufend >= bufstart
? bufend - bufstart
: (bufvoid - bufend) + bufstart) +
final long size = distanceTo(bufstart, bufend, bufvoid) +
partitions * APPROX_HEADER_LENGTH;
FSDataOutputStream out = null;
try {