/**
* Prepare the mapred.local.dir for the child. The child is sand-boxed now. Whenever it uses
* LocalDirAllocator from now on inside the child, it will only see files inside the
* attempt-directory. This is done in the Child's process space.
*/
static void setupChildMapredLocalDirs(Task t, JobConf conf) {
String[] localDirs = conf.getTrimmedStrings(JobConf.MAPRED_LOCAL_DIR_PROPERTY);
String jobId = t.getJobID().toString();
String taskId = t.getTaskID().toString();
boolean isCleanup = t.isTaskCleanupTask();
String user = t.getUser();
StringBuffer childMapredLocalDir =
new StringBuffer(
localDirs[0]
+ Path.SEPARATOR
+ TaskTracker.getLocalTaskDir(user, jobId, taskId, isCleanup));
for (int i = 1; i < localDirs.length; i++) {
childMapredLocalDir.append(
","
+ localDirs[i]
+ Path.SEPARATOR
+ TaskTracker.getLocalTaskDir(user, jobId, taskId, isCleanup));
}
LOG.debug("mapred.local.dir for child : " + childMapredLocalDir);
conf.set("mapred.local.dir", childMapredLocalDir.toString());
}
