@Override
  public List<HiveLock> lock(List<HiveLockObj> objs, boolean keepAlive, DriverState driverState)
      throws LockException {
    return lock(objs, numRetriesForLock, sleepTime);
  }
shared lock manager for dedicated hive server. all locks are managed in memory
ql/src/java/org/apache/hadoop/hive/ql/lockmgr/EmbeddedLockManager.java