}
private void open() throws MetaException {
isConnected = false;
TTransportException tte = null;
HadoopShims shim = ShimLoader.getHadoopShims();
boolean useSasl = conf.getBoolVar(ConfVars.METASTORE_USE_THRIFT_SASL);
boolean useFramedTransport = conf.getBoolVar(ConfVars.METASTORE_USE_THRIFT_FRAMED_TRANSPORT);
int clientSocketTimeout = conf.getIntVar(ConfVars.METASTORE_CLIENT_SOCKET_TIMEOUT);
for (int attempt = 0; !isConnected && attempt < retries; ++attempt) {
for (URI store : metastoreUris) {
LOG.info("Trying to connect to metastore with URI " + store);
try {
transport = new TSocket(store.getHost(), store.getPort(), 1000 * clientSocketTimeout);
if (useSasl) {
// Wrap thrift connection with SASL for secure connection.
try {
HadoopThriftAuthBridge.Client authBridge =
ShimLoader.getHadoopThriftAuthBridge().createClient();
// check if we should use delegation tokens to authenticate
// the call below gets hold of the tokens if they are set up by hadoop
// this should happen on the map/reduce tasks if the client added the
// tokens into hadoop's credential store in the front end during job
// submission.
String tokenSig = conf.get("hive.metastore.token.signature");
// tokenSig could be null
tokenStrForm = shim.getTokenStrForm(tokenSig);
if(tokenStrForm != null) {
// authenticate using delegation tokens via the "DIGEST" mechanism
transport = authBridge.createClientTransport(null, store.getHost(),
"DIGEST", tokenStrForm, transport,
MetaStoreUtils.getMetaStoreSaslProperties(conf));
} else {
String principalConfig =
conf.getVar(HiveConf.ConfVars.METASTORE_KERBEROS_PRINCIPAL);
transport = authBridge.createClientTransport(
principalConfig, store.getHost(), "KERBEROS", null,
transport, MetaStoreUtils.getMetaStoreSaslProperties(conf));
}
} catch (IOException ioe) {
LOG.error("Couldn't create client transport", ioe);
throw new MetaException(ioe.toString());
}
} else if (useFramedTransport) {
transport = new TFramedTransport(transport);
}
client = new ThriftHiveMetastore.Client(new TBinaryProtocol(transport));
try {
transport.open();
isConnected = true;
} catch (TTransportException e) {
tte = e;
if (LOG.isDebugEnabled()) {
LOG.warn("Failed to connect to the MetaStore Server...", e);
} else {
// Don't print full exception trace if DEBUG is not on.
LOG.warn("Failed to connect to the MetaStore Server...");
}
}
if (isConnected && !useSasl && conf.getBoolVar(ConfVars.METASTORE_EXECUTE_SET_UGI)){
// Call set_ugi, only in unsecure mode.
try {
UserGroupInformation ugi = shim.getUGIForConf(conf);
client.set_ugi(ugi.getUserName(), Arrays.asList(ugi.getGroupNames()));
} catch (LoginException e) {
LOG.warn("Failed to do login. set_ugi() is not successful, " +
"Continuing without it.", e);
} catch (IOException e) {