John Doe created MAPREDUCE-7088:
-----------------------------------
Summary: DistributedFSCheckMapper.doIO hangs with user
misconfigured inputs
Key: MAPREDUCE-7088
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7088
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: test
Affects Versions: 2.5.0
Reporter: John Doe
When a user configures the bufferSize to be 0, the for loop in
DistributedFSCheck$DistributedFSCheckMapper.doIO function hangs endlessly. Here
is the code snippet.
{code:java}
int bufferSize = DEFAULT_BUFFER_SIZE;
for(int i = 0; i < args.length; i++) { // parse command line
...
else if (args[i].equals("-bufferSize")) {
bufferSize = Integer.parseInt(args[++i]);
}
...
}
public Object doIO(Reporter reporter, String name, long offset) throws
IOException {
// open file
FSDataInputStream in = null;
Path p = new Path(name);
try {
in = fs.open(p);
} catch(IOException e) {
return name + "@(missing)";
}
in.seek(offset);
long actualSize = 0;
try {
long blockSize = fs.getDefaultBlockSize(p);
reporter.setStatus("reading " + name + "@" + offset + "/" + blockSize);
for( int curSize = bufferSize;
curSize == bufferSize && actualSize < blockSize;
actualSize += curSize) {
curSize = in.read(buffer, 0, bufferSize);
}
} catch(IOException e) {
...
} finally {
in.close();
}
return new Long(actualSize);
}
{code}
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