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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.lockmgr;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.Database;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.lockmgr.HiveLockObject.HiveLockObjectData;
import org.apache.hadoop.hive.ql.metadata.Hive;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.Partition;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.plan.LockDatabaseDesc;
import org.apache.hadoop.hive.ql.plan.LockTableDesc;
import org.apache.hadoop.hive.ql.plan.UnlockDatabaseDesc;
import org.apache.hadoop.hive.ql.plan.UnlockTableDesc;
/**
* An implementation HiveTxnManager that includes internal methods that all
* transaction managers need to implement but that we don't want to expose to
* outside.
*/
abstract class HiveTxnManagerImpl implements HiveTxnManager {
protected HiveConf conf;
private boolean isAutoCommit = true;//true by default; matches JDBC spec
void setHiveConf(HiveConf c) {
conf = c;
}
abstract protected void destruct();
@Override
public void closeTxnManager() {
destruct();
}
@Override
protected void finalize() throws Throwable {
destruct();
}
@Override
public void setAutoCommit(boolean autoCommit) throws LockException {
isAutoCommit = autoCommit;
}
@Override
public boolean getAutoCommit() {
return isAutoCommit;
}
@Override
public int lockTable(Hive db, LockTableDesc lockTbl) throws HiveException {
HiveLockManager lockMgr = getAndCheckLockManager();
HiveLockMode mode = HiveLockMode.valueOf(lockTbl.getMode());
String tabName = lockTbl.getTableName();
Table tbl = db.getTable(tabName);
if (tbl == null) {
throw new HiveException("Table " + tabName + " does not exist ");
}
Map partSpec = lockTbl.getPartSpec();
HiveLockObjectData lockData =
new HiveLockObjectData(lockTbl.getQueryId(),
String.valueOf(System.currentTimeMillis()),
"EXPLICIT",
lockTbl.getQueryStr());
if (partSpec == null) {
HiveLock lck = lockMgr.lock(new HiveLockObject(tbl, lockData), mode, true);
if (lck == null) {
return 1;
}
return 0;
}
Partition par = db.getPartition(tbl, partSpec, false);
if (par == null) {
throw new HiveException("Partition " + partSpec + " for table " +
tabName + " does not exist");
}
HiveLock lck = lockMgr.lock(new HiveLockObject(par, lockData), mode, true);
if (lck == null) {
return 1;
}
return 0;
}
@Override
public int unlockTable(Hive hiveDB, UnlockTableDesc unlockTbl) throws HiveException {
HiveLockManager lockMgr = getAndCheckLockManager();
String tabName = unlockTbl.getTableName();
HiveLockObject obj = HiveLockObject.createFrom(hiveDB, tabName,
unlockTbl.getPartSpec());
List locks = lockMgr.getLocks(obj, false, false);
if ((locks == null) || (locks.isEmpty())) {
throw new HiveException("Table " + tabName + " is not locked ");
}
Iterator locksIter = locks.iterator();
while (locksIter.hasNext()) {
HiveLock lock = locksIter.next();
lockMgr.unlock(lock);
}
return 0;
}
@Override
public int lockDatabase(Hive hiveDB, LockDatabaseDesc lockDb) throws HiveException {
HiveLockManager lockMgr = getAndCheckLockManager();
HiveLockMode mode = HiveLockMode.valueOf(lockDb.getMode());
String dbName = lockDb.getDatabaseName();
Database dbObj = hiveDB.getDatabase(dbName);
if (dbObj == null) {
throw new HiveException("Database " + dbName + " does not exist ");
}
HiveLockObjectData lockData =
new HiveLockObjectData(lockDb.getQueryId(),
String.valueOf(System.currentTimeMillis()),
"EXPLICIT", lockDb.getQueryStr());
HiveLock lck = lockMgr.lock(new HiveLockObject(dbObj.getName(), lockData), mode, true);
if (lck == null) {
return 1;
}
return 0;
}
@Override
public int unlockDatabase(Hive hiveDB, UnlockDatabaseDesc unlockDb) throws HiveException {
HiveLockManager lockMgr = getAndCheckLockManager();
String dbName = unlockDb.getDatabaseName();
Database dbObj = hiveDB.getDatabase(dbName);
if (dbObj == null) {
throw new HiveException("Database " + dbName + " does not exist ");
}
HiveLockObject obj = new HiveLockObject(dbObj.getName(), null);
List locks = lockMgr.getLocks(obj, false, false);
if ((locks == null) || (locks.isEmpty())) {
throw new HiveException("Database " + dbName + " is not locked ");
}
for (HiveLock lock: locks) {
lockMgr.unlock(lock);
}
return 0;
}
/**
* Gets the lock manager and verifies if the explicit lock is supported
* @return the lock manager
* @throws HiveException
*/
protected HiveLockManager getAndCheckLockManager() throws HiveException {
HiveLockManager lockMgr = getLockManager();
if (lockMgr == null) {
throw new HiveException("LockManager cannot be acquired");
}
if (!supportsExplicitLock()) {
throw new HiveException(ErrorMsg.LOCK_REQUEST_UNSUPPORTED,
conf.getVar(HiveConf.ConfVars.HIVE_TXN_MANAGER));
}
return lockMgr;
}
}
