jiwq commented on a change in pull request #1397: MAPREDUCE-7237. Supports 
config the shuffle's path cache related parameters
URL: https://github.com/apache/hadoop/pull/1397#discussion_r366278621
 
 

 ##########
 File path: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-shuffle/src/main/java/org/apache/hadoop/mapred/ShuffleHandler.java
 ##########
 @@ -836,63 +834,58 @@ public ChannelPipeline getPipeline() throws Exception {
       // TODO factor out encode/decode to permit binary shuffle
       // TODO factor out decode of index to permit alt. models
     }
-
   }
 
   class Shuffle extends SimpleChannelUpstreamHandler {
-    private static final int MAX_WEIGHT = 10 * 1024 * 1024;
-    private static final int EXPIRE_AFTER_ACCESS_MINUTES = 5;
-    private static final int ALLOWED_CONCURRENCY = 16;
-    private final Configuration conf;
+    private static final String MAX_WEIGHT =
+        "mapreduce.shuffle.pathcache.max-weight";
+    private static final int DEFAULT_MAX_WEIGHT = 10 * 1024 * 1024;
+
+    private static final String EXPIRE_AFTER_ACCESS_MINUTES =
+        "mapreduce.shuffle.pathcache.expire-after-access-m";
 
 Review comment:
   Done.

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