HADOOP-10305. Add rpc.metrics.quantile.enable and rpc.metrics.percentiles.intervals to core-default.xml. Contributed by Akira Ajisaka.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.3@1562661 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -145,6 +145,10 @@ Release 2.3.0 - UNRELEASED
     HADOOP-9652. Allow RawLocalFs#getFileLinkStatus to fill in the link owner
     and mode if requested. (Andrew Wang via Colin Patrick McCabe)
 
+    HADOOP-10305. Add "rpc.metrics.quantile.enable" and
+    "rpc.metrics.percentiles.intervals" to core-default.xml.
+    (Akira Ajisaka via wang)
+
   OPTIMIZATIONS
 
     HADOOP-10142. Avoid groups lookup for unprivileged users such as "dr.who"

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java

@@ -245,6 +245,7 @@ public class CommonConfigurationKeys extends CommonConfigurationKeysPublic {
 
   public static final String RPC_METRICS_QUANTILE_ENABLE =
       "rpc.metrics.quantile.enable";
+  public static final boolean RPC_METRICS_QUANTILE_ENABLE_DEFAULT = false;
   public static final String  RPC_METRICS_PERCENTILES_INTERVALS_KEY =
       "rpc.metrics.percentiles.intervals";
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/metrics/RpcMetrics.java

@@ -54,7 +54,8 @@ public class RpcMetrics {
     int[] intervals = conf.getInts(
         CommonConfigurationKeys.RPC_METRICS_PERCENTILES_INTERVALS_KEY);
     rpcQuantileEnable = (intervals.length > 0) && conf.getBoolean(
-        CommonConfigurationKeys.RPC_METRICS_QUANTILE_ENABLE, false);
+        CommonConfigurationKeys.RPC_METRICS_QUANTILE_ENABLE,
+        CommonConfigurationKeys.RPC_METRICS_QUANTILE_ENABLE_DEFAULT);
     if (rpcQuantileEnable) {
       rpcQueueTimeMillisQuantiles =
           new MutableQuantiles[intervals.length];

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

@@ -1268,4 +1268,26 @@
     Default, "dr.who=;" will consider "dr.who" as user without groups.
   </description>
 </property>
+
+<property>
+  <name>rpc.metrics.quantile.enable</name>
+  <value>false</value>
+  <description>
+    Setting this property to true and rpc.metrics.percentiles.intervals
+    to a comma-separated list of the granularity in seconds, the
+    50/75/90/95/99th percentile latency for rpc queue/processing time in
+    milliseconds are added to rpc metrics.
+  </description>
+</property>
+
+<property>
+  <name>rpc.metrics.percentiles.intervals</name>
+  <value></value>
+  <description>
+    A comma-separated list of the granularity in seconds for the metrics which
+    describe the 50/75/90/95/99th percentile latency for rpc queue/processing
+    time. The metrics are outputted if rpc.metrics.quantile.enable is set to
+    true.
+  </description>
+</property>
 </configuration>