TrackerDistributedCacheManager.determineCacheVisibilities(subConf);
// ****** End of imitating JobClient code
// ****** Imitate TaskRunner code.
TaskDistributedCacheManager handle =
manager.newTaskDistributedCacheManager(new JobID("jt", 1), subConf);
assertNull(null, DistributedCache.getLocalCacheFiles(subConf));
File workDir = new File(new Path(TEST_ROOT_DIR, "workdir").toString());
handle.setupCache(subConf, TaskTracker.getPublicDistributedCacheDir(),
TaskTracker.getPrivateDistributedCacheDir(userName));
//TODO this doesn't really happen in the TaskRunner
// handle.setupPrivateCache(localDirAllocator, TaskTracker
// .getPrivateDistributedCacheDir(userName));
// ****** End of imitating TaskRunner code
Path[] localCacheFiles = DistributedCache.getLocalCacheFiles(subConf);
assertNotNull(null, localCacheFiles);
assertEquals(1, localCacheFiles.length);
Path cachedFirstFile = localCacheFiles[0];
assertFileLengthEquals(firstCacheFile, cachedFirstFile);
assertFalse("Paths should be different.",
firstCacheFile.equals(cachedFirstFile));
// release
handle.release();
// change the file timestamp
FileSystem fs = FileSystem.get(myConf);
((FakeFileSystem)fs).advanceClock(1);
// running a task of the same job
Throwable th = null;
try {
handle.setupCache(subConf, TaskTracker.getPublicDistributedCacheDir(),
TaskTracker.getPrivateDistributedCacheDir(userName));
// handle.setupPrivateCache(localDirAllocator, TaskTracker
// .getPrivateDistributedCacheDir(userName));
} catch (IOException ie) {
th = ie;
}
assertNotNull("Throwable is null", th);
assertTrue("Exception message does not match",
th.getMessage().contains("has changed on HDFS since job started"));
// release
handle.release();
// submit another job
Configuration subConf2 = new Configuration(myConf);
subConf2.set("user.name", userName);
DistributedCache.addCacheFile(firstCacheFile.toUri(), subConf2);
TrackerDistributedCacheManager.determineTimestamps(subConf2);
TrackerDistributedCacheManager.determineCacheVisibilities(subConf2);
handle =
manager.newTaskDistributedCacheManager(new JobID("jt", 2), subConf2);
handle.setupCache(subConf2, TaskTracker.getPublicDistributedCacheDir(),
TaskTracker.getPrivateDistributedCacheDir(userName));
Path[] localCacheFiles2 = DistributedCache.getLocalCacheFiles(subConf2);
assertNotNull(null, localCacheFiles2);
assertEquals(1, localCacheFiles2.length);