YARN-4685. Disable AM blacklisting by default to mitigate situations that 
application get hanged. (Rohith Sharma K S via wangda)

(cherry picked from commit 2da32a6ef9edebd86ca9672d10ce35b5a46818cc)
(cherry picked from commit 3e511f39c220ef65708125a37e630c495c450ad1)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/2e9d84d2
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/2e9d84d2
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/2e9d84d2

Branch: refs/heads/branch-2.8
Commit: 2e9d84d24c730b1c94ba36e2860691d9db8d5930
Parents: 9bf420b
Author: Wangda Tan <[email protected]>
Authored: Fri Aug 19 16:31:16 2016 -0700
Committer: Wangda Tan <[email protected]>
Committed: Fri Aug 19 16:55:40 2016 -0700

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 .../main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/2e9d84d2/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
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diff --git 
a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
 
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
index 25441c9..5ce171c 100644
--- 
a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
+++ 
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
@@ -2356,7 +2356,7 @@ public class YarnConfiguration extends Configuration {
       RM_PREFIX + "am-scheduling.node-blacklisting-enabled";
   @Private
   public static final boolean DEFAULT_AM_SCHEDULING_NODE_BLACKLISTING_ENABLED =
-      true;
+      false;
 
   @Private
   /**
@@ -2366,7 +2366,7 @@ public class YarnConfiguration extends Configuration {
       RM_PREFIX + "am-scheduling.node-blacklisting-disable-threshold";
   @Private
   public static final float
-      DEFAULT_AM_SCHEDULING_NODE_BLACKLISTING_DISABLE_THRESHOLD = 0.8f;
+      DEFAULT_AM_SCHEDULING_NODE_BLACKLISTING_DISABLE_THRESHOLD = 0.2f;
 
   private static final String NM_SCRIPT_BASED_NODE_LABELS_PROVIDER_PREFIX =
       NM_NODE_LABELS_PROVIDER_PREFIX + "script.";


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