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https://issues.apache.org/jira/browse/MAPREDUCE-7088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Doe updated MAPREDUCE-7088:
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Component/s: client
> 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: client, test
> Affects Versions: 2.5.0
> Reporter: John Doe
> Priority: Minor
>
> 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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