YARN-782. vcores-pcores ratio functions differently from vmem-pmem ratio in misleading way. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1493065 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -317,6 +317,9 @@ Release 2.1.0-beta - UNRELEASED
     YARN-692. Creating NMToken master key on RM and sharing it with NM as a part
     of RM-NM heartbeat. (Omkar Vinit Joshi via vinodkv)
 
+    YARN-782. vcores-pcores ratio functions differently from vmem-pmem ratio in 
+    misleading way. (sandyr via tucu)
+
   OPTIMIZATIONS
 
     YARN-512. Log aggregation root directory check is more expensive than it

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -470,14 +470,9 @@ public class YarnConfiguration extends Configuration {
     NM_PREFIX + "vmem-pmem-ratio";
   public static final float DEFAULT_NM_VMEM_PMEM_RATIO = 2.1f;
   
-  /** Number of Physical CPU Cores which can be allocated for containers.*/
-  public static final String NM_VCORES = NM_PREFIX + "resource.cpu-cores";
+  /** Number of Virtual CPU Cores which can be allocated for containers.*/
+  public static final String NM_VCORES = NM_PREFIX + "resource.cpu-vcores";
   public static final int DEFAULT_NM_VCORES = 8;
-
-  /** Conversion ratio for physical cores to virtual cores. */
-  public static final String NM_VCORES_PCORES_RATIO =
-      NM_PREFIX + "vcores-pcores-ratio";
-  public static final float DEFAULT_NM_VCORES_PCORES_RATIO = 2.0f;
   
   /** NM Webapp address.**/
   public static final String NM_WEBAPP_ADDRESS = NM_PREFIX + "webapp.address";

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -510,18 +510,10 @@
   <property>
     <description>Number of CPU cores that can be allocated 
     for containers.</description>
-    <name>yarn.nodemanager.resource.cpu-cores</name>
+    <name>yarn.nodemanager.resource.cpu-vcores</name>
     <value>8</value>
   </property>
 
-  <property>
-    <description>Ratio between virtual cores to physical cores when
-    allocating CPU resources to containers. 
-    </description>
-    <name>yarn.nodemanager.vcores-pcores-ratio</name>
-    <value>2</value>
-  </property>
-
   <property>
     <description>NM Webapp address.</description>
     <name>yarn.nodemanager.webapp.address</name>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NodeStatusUpdaterImpl.java

@@ -124,14 +124,9 @@ public class NodeStatusUpdaterImpl extends AbstractService implements
             YarnConfiguration.DEFAULT_NM_VMEM_PMEM_RATIO); 
     int virtualMemoryMb = (int)Math.ceil(memoryMb * vMemToPMem);
     
-    int cpuCores =
+    int virtualCores =
         conf.getInt(
             YarnConfiguration.NM_VCORES, YarnConfiguration.DEFAULT_NM_VCORES);
-    float vCoresToPCores =             
-        conf.getFloat(
-            YarnConfiguration.NM_VCORES_PCORES_RATIO, 
-            YarnConfiguration.DEFAULT_NM_VCORES_PCORES_RATIO); 
-    int virtualCores = (int)Math.ceil(cpuCores * vCoresToPCores); 
 
     this.totalResource = recordFactory.newRecordInstance(Resource.class);
     this.totalResource.setMemory(memoryMb);
@@ -144,7 +139,7 @@ public class NodeStatusUpdaterImpl extends AbstractService implements
     
     LOG.info("Initialized nodemanager for " + nodeId + ":" +
         " physical-memory=" + memoryMb + " virtual-memory=" + virtualMemoryMb +
-        " physical-cores=" + cpuCores + " virtual-cores=" + virtualCores);
+        " virtual-cores=" + virtualCores);
     
     super.serviceInit(conf);
   }