HashMultimap.create(0, 1);
public ShortCircuitRegistry(Configuration conf) throws IOException {
boolean enabled = false;
SharedFileDescriptorFactory shmFactory = null;
DomainSocketWatcher watcher = null;
try {
int interruptCheck = conf.getInt(
DFS_SHORT_CIRCUIT_SHARED_MEMORY_WATCHER_INTERRUPT_CHECK_MS,
DFS_SHORT_CIRCUIT_SHARED_MEMORY_WATCHER_INTERRUPT_CHECK_MS_DEFAULT);
if (interruptCheck <= 0) {
throw new IOException(
DFS_SHORT_CIRCUIT_SHARED_MEMORY_WATCHER_INTERRUPT_CHECK_MS +
" was set to " + interruptCheck);
}
String shmPaths[] =
conf.getTrimmedStrings(DFS_DATANODE_SHARED_FILE_DESCRIPTOR_PATHS);
if (shmPaths.length == 0) {
shmPaths =
DFS_DATANODE_SHARED_FILE_DESCRIPTOR_PATHS_DEFAULT.split(",");
}
shmFactory = SharedFileDescriptorFactory.
create("HadoopShortCircuitShm_", shmPaths);
String dswLoadingFailure = DomainSocketWatcher.getLoadingFailureReason();
if (dswLoadingFailure != null) {
throw new IOException(dswLoadingFailure);
}
watcher = new DomainSocketWatcher(interruptCheck);
enabled = true;
if (LOG.isDebugEnabled()) {
LOG.debug("created new ShortCircuitRegistry with interruptCheck=" +
interruptCheck + ", shmPath=" + shmFactory.getPath());
}