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Subject [GitHub] [hadoop] jlowe commented on a change in pull request #1920: MAPREDUCE-7241. FileInputFormat listStatus with less memory footprint
Date Sat, 28 Mar 2020 18:31:33 GMT
jlowe commented on a change in pull request #1920: MAPREDUCE-7241. FileInputFormat listStatus
with less memory footprint
URL: https://github.com/apache/hadoop/pull/1920#discussion_r399693801
 
 

 ##########
 File path: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/input/TestFileInputFormat.java
 ##########
 @@ -238,6 +238,44 @@ public void testListStatusErrorOnNonExistantDir() throws IOException
{
     }
   }
 
+  @Test
+  public void testShrinkStatus() throws IOException {
+    Configuration conf = getConfiguration();
+    MockFileSystem mockFs =
+            (MockFileSystem) new Path("test:///").getFileSystem(conf);
+    Path dir1  = new Path("test:/a1");
+    RemoteIterator<LocatedFileStatus> statuses = mockFs.listLocatedStatus(dir1);
 
 Review comment:
   This test doesn't test what we care about in this change.  `MockFileSystem` doesn't return
a derived class of `BlockLocation` so nothing shrinks.  This test passes if `shrinkStatus`
simply returned the original status, showing it really isn't a useful test for verifying we
don't regress and start caching large location statuses again.

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