@Override
public HiveLockManager getLockManager() throws LockException {
if (lockMgr == null) {
boolean supportConcurrency = conf.getBoolVar(HiveConf.ConfVars.HIVE_SUPPORT_CONCURRENCY);
if (supportConcurrency) {
String lockMgrName = conf.getVar(HiveConf.ConfVars.HIVE_LOCK_MANAGER);
if ((lockMgrName == null) || (lockMgrName.isEmpty())) {
throw new LockException(ErrorMsg.LOCKMGR_NOT_SPECIFIED.getMsg());
}
try {
LOG.info("Creating lock manager of type " + lockMgrName);
lockMgr =
(HiveLockManager) ReflectionUtils.newInstance(conf.getClassByName(lockMgrName), conf);
lockMgr.setContext(new HiveLockManagerCtx(conf));
} catch (Exception e) {
// set hiveLockMgr to null just in case this invalid manager got set to
// next query's ctx.
if (lockMgr != null) {
try {
lockMgr.close();
} catch (LockException e1) {
// nothing can do here
}
lockMgr = null;
}
throw new LockException(ErrorMsg.LOCKMGR_NOT_INITIALIZED.getMsg() + e.getMessage());
}
} else {
LOG.info("Concurrency mode is disabled, not creating a lock manager");
return null;
}
}
// Force a re-read of the configuration file. This is done because
// different queries in the session may be using the same lock manager.
lockMgr.refresh();
return lockMgr;
}
