YARN-2019. Retrospect on decision of making RM crashed if any exception throw in ZKRMStateStore. Contributed by Jian He.

hadoop-yarn-project/CHANGES.txt

@@ -144,6 +144,9 @@ Release 2.8.0 - UNRELEASED
     YARN-2003. Support for Application priority : Changes in RM and Capacity 
     Scheduler. (Sunil G via wangda)
 
+    YARN-2019. Retrospect on decision of making RM crashed if any exception throw 
+    in ZKRMStateStore. (Jian He via junping_du)
+
   IMPROVEMENTS
 
     YARN-644. Basic null check is not performed on passed in arguments before

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

@@ -401,6 +401,11 @@ public class YarnConfiguration extends Configuration {
   public static final String RECOVERY_ENABLED = RM_PREFIX + "recovery.enabled";
   public static final boolean DEFAULT_RM_RECOVERY_ENABLED = false;
 
+  public static final String YARN_FAIL_FAST = YARN_PREFIX + "fail-fast";
+  public static final boolean DEFAULT_YARN_FAIL_FAST = true;
+
+  public static final String RM_FAIL_FAST = RM_PREFIX + "fail-fast";
+
   @Private
   public static final String RM_WORK_PRESERVING_RECOVERY_ENABLED = RM_PREFIX
       + "work-preserving-recovery.enabled";
@@ -2018,6 +2023,12 @@ public class YarnConfiguration extends Configuration {
             YARN_HTTP_POLICY_DEFAULT));
   }
 
+  public static boolean shouldRMFailFast(Configuration conf) {
+    return conf.getBoolean(YarnConfiguration.RM_FAIL_FAST,
+        conf.getBoolean(YarnConfiguration.YARN_FAIL_FAST,
+            YarnConfiguration.DEFAULT_YARN_FAIL_FAST));
+  }
+
   @Private
   public static String getClusterId(Configuration conf) {
     String clusterId = conf.get(YarnConfiguration.RM_CLUSTER_ID);

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

@@ -323,6 +323,22 @@
     <value>false</value>
   </property>
 
+  <property>
+    <description>Should RM fail fast if it encounters any errors. By defalt, it
+      points to ${yarn.fail-fast}. Errors include:
+      1) exceptions when state-store write/read operations fails.
+    </description>
+    <name>yarn.resourcemanager.fail-fast</name>
+    <value>${yarn.fail-fast}</value>
+  </property>
+
+  <property>
+    <description>Should YARN fail fast if it encounters any errors.
+    </description>
+    <name>yarn.fail-fast</name>
+    <value>true</value>
+  </property>
+
   <property>
     <description>Enable RM work preserving recovery. This configuration is private
     to YARN for experimenting the feature.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/recovery/RMStateStore.java

@@ -44,6 +44,7 @@ import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
 import org.apache.hadoop.yarn.api.records.impl.pb.ApplicationSubmissionContextPBImpl;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.event.AsyncDispatcher;
 import org.apache.hadoop.yarn.event.Dispatcher;
 import org.apache.hadoop.yarn.event.EventHandler;
@@ -855,6 +856,7 @@ public abstract class RMStateStore extends AbstractService {
    * @param failureCause the exception due to which the operation failed
    */
   protected void notifyStoreOperationFailed(Exception failureCause) {
+    LOG.error("State store operation failed ", failureCause);
     if (failureCause instanceof StoreFencedException) {
       updateFencedState();
       Thread standByTransitionThread =
@@ -862,8 +864,11 @@ public abstract class RMStateStore extends AbstractService {
       standByTransitionThread.setName("StandByTransitionThread Handler");
       standByTransitionThread.start();
     } else {
-      rmDispatcher.getEventHandler().handle(
-        new RMFatalEvent(RMFatalEventType.STATE_STORE_OP_FAILED, failureCause));
+      if (YarnConfiguration.shouldRMFailFast(getConfig())) {
+        rmDispatcher.getEventHandler().handle(
+            new RMFatalEvent(RMFatalEventType.STATE_STORE_OP_FAILED,
+                failureCause));
+      }
     }
   }