cndaimin opened a new pull request #3593:
URL: https://github.com/apache/hadoop/pull/3593
This patch is tested by `hdfs debug` tool.
Check a good file:
```
$ hdfs debug verifyEC -file /dfsperf.0.0
Checking EC block group: blk_-9223372036854774784
Status: OK
Checking EC block group: blk_-9223372036854774768
Status: OK
Checking EC block group: blk_-9223372036854774752
Status: OK
All EC block group status: OK
```
Check a bad file:
```
$ hdfs debug verifyEC -file /sc.dat
Checking EC block group: blk_-9223372036854774736
Status: ERROR, message: EC compute result not match.
```
Help message:
```
$ hdfs debug verifyEC
verifyEC -file <file>
Verify HDFS erasure coding on all block groups of the file.
```
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