/**
* Returns a list of blocks that have timed out their replication requests. Returns null if no
* blocks have timed out.
*/
Block[] getTimedOutBlocks() {
synchronized (timedOutItems) {
if (timedOutItems.size() <= 0) {
return null;
}
Block[] blockList = timedOutItems.toArray(new Block[timedOutItems.size()]);
timedOutItems.clear();
return blockList;
}
}
/**
* Get the archive entries in classpath as an array of Path
*
* @param conf Configuration that contains the classpath setting
*/
public static Path[] getArchiveClassPaths(Configuration conf) {
String classpath = conf.get("mapred.job.classpath.archives");
if (classpath == null) return null;
ArrayList list =
Collections.list(new StringTokenizer(classpath, System.getProperty("path.separator")));
Path[] paths = new Path[list.size()];
for (int i = 0; i < list.size(); i++) {
paths[i] = new Path((String) list.get(i));
}
return paths;
}
private float mean(ArrayList<Integer> l) {
int t = l.size();
Integer sum = new Integer(0);
for (Integer i : l) {
sum += i;
}
return ((float) sum) / t;
}
private float standard_deviation(ArrayList<Integer> l) {
int t = l.size();
float ans = 0, mn = this.mean(l);
for (Integer i : l) {
ans += (i - mn) * (i - mn);
}
return (float) Math.sqrt(ans / (t - 1));
}
/**
* This method gets called everytime before any read/write to make sure that any change to
* localDirs is reflected immediately.
*/
private synchronized void confChanged(Configuration conf) throws IOException {
String newLocalDirs = conf.get(contextCfgItemName);
if (!newLocalDirs.equals(savedLocalDirs)) {
String[] localDirs = conf.getStrings(contextCfgItemName);
localFS = FileSystem.getLocal(conf);
int numDirs = localDirs.length;
ArrayList<String> dirs = new ArrayList<String>(numDirs);
ArrayList<DF> dfList = new ArrayList<DF>(numDirs);
for (int i = 0; i < numDirs; i++) {
try {
// filter problematic directories
Path tmpDir = new Path(localDirs[i]);
if (localFS.mkdirs(tmpDir) || localFS.exists(tmpDir)) {
try {
DiskChecker.checkDir(new File(localDirs[i]));
dirs.add(localDirs[i]);
dfList.add(new DF(new File(localDirs[i]), 30000));
} catch (DiskErrorException de) {
LOG.warn(localDirs[i] + "is not writable\n" + StringUtils.stringifyException(de));
}
} else {
LOG.warn("Failed to create " + localDirs[i]);
}
} catch (IOException ie) {
LOG.warn(
"Failed to create "
+ localDirs[i]
+ ": "
+ ie.getMessage()
+ "\n"
+ StringUtils.stringifyException(ie));
} // ignore
}
localDirsPath = new Path[dirs.size()];
for (int i = 0; i < localDirsPath.length; i++) {
localDirsPath[i] = new Path(dirs.get(i));
}
dirDF = dfList.toArray(new DF[dirs.size()]);
savedLocalDirs = newLocalDirs;
// randomize the first disk picked in the round-robin selection
dirNumLastAccessed = dirIndexRandomizer.nextInt(dirs.size());
}
}
private int median(ArrayList<Integer> l) {
Collections.sort(l);
int t = l.size();
return l.get(t / 2);
}