ayushtkn commented on code in PR #5568:
URL: https://github.com/apache/hadoop/pull/5568#discussion_r1171494224


##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/shortcircuit/ShortCircuitCache.java:
##########
@@ -383,7 +384,9 @@ public ShortCircuitCache(int maxTotalSize, long 
maxNonMmappedEvictableLifespanMs
     this.maxTotalSize = maxTotalSize;
     Preconditions.checkArgument(maxNonMmappedEvictableLifespanMs >= 0);
     this.maxNonMmappedEvictableLifespanMs = maxNonMmappedEvictableLifespanMs;
-    Preconditions.checkArgument(maxEvictableMmapedSize >= 0);
+    Preconditions.checkArgument(maxEvictableMmapedSize >= 0,
+      "Invalid argument: " + HdfsClientConfigKeys.Mmap.CACHE_SIZE_KEY +
+      " must be greater than zero.");
     this.maxEvictableMmapedSize = maxEvictableMmapedSize;
     Preconditions.checkArgument(maxEvictableMmapedLifespanMs >= 0);

Review Comment:
   Do the same for other ``PreConditions`` as well



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