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MAPREDUCE-5689. MRAppMaster does not preempt reducers when scheduled maps cannot be fulfilled. (lohit via kasha) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555162 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Karthik Kambatla 2014-01-03 17:32:02 +00:00
parent 8e135fc73c
commit 2bbd22bbd5
3 changed files with 20 additions and 1 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
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@ -121,6 +121,9 @@ Release 2.4.0 - UNRELEASED
MAPREDUCE-5685. Fixed a bug with JobContext getCacheFiles API inside the
WrappedReducer class. (Yi Song via vinodkv)
MAPREDUCE-5689. MRAppMaster does not preempt reducers when scheduled maps
cannot be fulfilled. (lohit via kasha)
Release 2.3.0 - UNRELEASED
INCOMPATIBLE CHANGES

3
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java
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@ -223,7 +223,8 @@ public class RMContainerAllocator extends RMContainerRequestor
int completedMaps = getJob().getCompletedMaps();
int completedTasks = completedMaps + getJob().getCompletedReduces();
if (lastCompletedTasks != completedTasks) {
if ((lastCompletedTasks != completedTasks) ||
(scheduledRequests.maps.size() > 0)) {
lastCompletedTasks = completedTasks;
recalculateReduceSchedule = true;
}

15
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestRMContainerAllocator.java
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@ -1600,6 +1600,21 @@ public class TestRMContainerAllocator {
numPendingReduces,
maxReduceRampupLimit, reduceSlowStart);
verify(allocator).rampDownReduces(anyInt());
// Test reduce ramp-down for when there are scheduled maps
// Since we have two scheduled Maps, rampDownReducers
// should be invoked twice.
scheduledMaps = 2;
assignedReduces = 2;
doReturn(10 * 1024).when(allocator).getMemLimit();
allocator.scheduleReduces(
totalMaps, succeededMaps,
scheduledMaps, scheduledReduces,
assignedMaps, assignedReduces,
mapResourceReqt, reduceResourceReqt,
numPendingReduces,
maxReduceRampupLimit, reduceSlowStart);
verify(allocator, times(2)).rampDownReduces(anyInt());
}
private static class RecalculateContainerAllocator extends MyContainerAllocator {