1996fanrui commented on a change in pull request #2241:
URL: https://github.com/apache/hadoop/pull/2241#discussion_r478148190



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
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@@ -414,6 +415,11 @@
 
     String  PREFETCH_SIZE_KEY = PREFIX + "prefetch.size";
 
+    String URI_CACHE_KEY = PREFIX + "uri.cache.enable";
+    boolean URI_CACHE_DEFAULT = false;
+    String URI_CACHE_EXPIRE_MS_KEY = PREFIX + "uri.cache.expire.ms";

Review comment:
       I'm so sorry, I misunderstood the meaning of jira. I thought the two 
parameters cache size and expire time seem a bit overkill, so the cache size 
was removed and the expire time was retained.
   Now I will remove expire time and use 12 hours as the default value.




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