hfutatzhanghb commented on code in PR #6368:
URL: https://github.com/apache/hadoop/pull/6368#discussion_r1458453315


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSOutputStream.java:
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@@ -184,6 +186,40 @@ public void testPreventOverflow() throws IOException, 
NoSuchFieldException,
     runAdjustChunkBoundary(configuredWritePacketSize, finalWritePacketSize);
   }
 
+  @Test(timeout=60000)
+  public void testFirstPacketSizeInNewBlocks() throws IOException {
+    final long blockSize = 1L * 1024 * 1024;
+    final int numDataNodes = 3;
+    final Configuration dfsConf = new Configuration();
+    dfsConf.setLong(DFS_BLOCK_SIZE_KEY, blockSize);
+    MiniDFSCluster dfsCluster = null;
+    dfsCluster = new 
MiniDFSCluster.Builder(dfsConf).numDataNodes(numDataNodes).build();
+    dfsCluster.waitActive();
+
+    DistributedFileSystem fs = dfsCluster.getFileSystem();
+    Path fileName = new Path("/testfile.dat");
+    FSDataOutputStream fos = fs.create(fileName);
+    DataChecksum crc32c = 
DataChecksum.newDataChecksum(DataChecksum.Type.CRC32C, 512);
+
+    long loop = 0;
+    Random r = new Random();
+    byte[] buf = new byte[1 * 1024 * 1024];

Review Comment:
   Very nice suggestion, Thanks a lot sir. I will fix them laterly



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