Creat a comprehensive functional test for append
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Key: HDFS-728
URL: https://issues.apache.org/jira/browse/HDFS-728
Project: Hadoop HDFS
Issue Type: New Feature
Affects Versions: 0.21.0
Reporter: Hairong Kuang
Fix For: 0.21.0
This test aims to do
1. create a file of len1;
2. reopen the file for append;
3. write len2 bytes to the file and hflush;
4. write len3 bytes to the file and close the file;
5. validate the content of the file.
Len1 ranges from [0, 2*BLOCK_SIZE+1], len2 ranges from [0, BLOCK_SIZE+1], and
len3 ranges from [0, BLOCK_SIZE+1]. The test tries all combination of len1,
len2, and len3. To minimize the running time, bytes per checksum is set to be 4
bytes, each packet size is set to be bytes per checksum, and each block
contains 2 packets.
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