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Server functionality for HBase
/*
* 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.hbase.master.procedure;
import java.io.IOException;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.NamespaceExistException;
import org.apache.hadoop.hbase.master.MasterFileSystem;
import org.apache.hadoop.hbase.master.TableNamespaceManager;
import org.apache.hadoop.hbase.procedure2.ProcedureStateSerializer;
import org.apache.hadoop.hbase.util.CommonFSUtils;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos;
import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.CreateNamespaceState;
/**
* The procedure to create a new namespace.
*/
@InterfaceAudience.Private
public class CreateNamespaceProcedure
extends AbstractStateMachineNamespaceProcedure {
private static final Logger LOG = LoggerFactory.getLogger(CreateNamespaceProcedure.class);
private NamespaceDescriptor nsDescriptor;
private Boolean traceEnabled;
public CreateNamespaceProcedure() {
this.traceEnabled = null;
}
public CreateNamespaceProcedure(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor) {
this(env, nsDescriptor, null);
}
public CreateNamespaceProcedure(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor, ProcedurePrepareLatch latch) {
super(env, latch);
this.nsDescriptor = nsDescriptor;
this.traceEnabled = null;
}
@Override
protected Flow executeFromState(final MasterProcedureEnv env, final CreateNamespaceState state)
throws InterruptedException {
if (isTraceEnabled()) {
LOG.trace(this + " execute state=" + state);
}
try {
switch (state) {
case CREATE_NAMESPACE_PREPARE:
boolean success = prepareCreate(env);
releaseSyncLatch();
if (!success) {
assert isFailed() : "createNamespace should have an exception here";
return Flow.NO_MORE_STATE;
}
setNextState(CreateNamespaceState.CREATE_NAMESPACE_CREATE_DIRECTORY);
break;
case CREATE_NAMESPACE_CREATE_DIRECTORY:
createDirectory(env, nsDescriptor);
setNextState(CreateNamespaceState.CREATE_NAMESPACE_INSERT_INTO_NS_TABLE);
break;
case CREATE_NAMESPACE_INSERT_INTO_NS_TABLE:
insertIntoNSTable(env, nsDescriptor);
setNextState(CreateNamespaceState.CREATE_NAMESPACE_UPDATE_ZK);
break;
case CREATE_NAMESPACE_UPDATE_ZK:
updateZKNamespaceManager(env, nsDescriptor);
setNextState(CreateNamespaceState.CREATE_NAMESPACE_SET_NAMESPACE_QUOTA);
break;
case CREATE_NAMESPACE_SET_NAMESPACE_QUOTA:
setNamespaceQuota(env, nsDescriptor);
return Flow.NO_MORE_STATE;
default:
throw new UnsupportedOperationException(this + " unhandled state=" + state);
}
} catch (IOException e) {
if (isRollbackSupported(state)) {
setFailure("master-create-namespace", e);
} else {
LOG.warn("Retriable error trying to create namespace=" + nsDescriptor.getName()
+ " (in state=" + state + ")", e);
}
}
return Flow.HAS_MORE_STATE;
}
@Override
protected void rollbackState(final MasterProcedureEnv env, final CreateNamespaceState state)
throws IOException {
if (state == CreateNamespaceState.CREATE_NAMESPACE_PREPARE) {
// nothing to rollback, pre-create is just state checks.
// TODO: coprocessor rollback semantic is still undefined.
releaseSyncLatch();
return;
}
// The procedure doesn't have a rollback. The execution will succeed, at some point.
throw new UnsupportedOperationException("unhandled state=" + state);
}
@Override
protected boolean isRollbackSupported(final CreateNamespaceState state) {
switch (state) {
case CREATE_NAMESPACE_PREPARE:
return true;
default:
return false;
}
}
@Override
protected CreateNamespaceState getState(final int stateId) {
return CreateNamespaceState.forNumber(stateId);
}
@Override
protected int getStateId(final CreateNamespaceState state) {
return state.getNumber();
}
@Override
protected CreateNamespaceState getInitialState() {
return CreateNamespaceState.CREATE_NAMESPACE_PREPARE;
}
@Override
protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException {
super.serializeStateData(serializer);
MasterProcedureProtos.CreateNamespaceStateData.Builder createNamespaceMsg =
MasterProcedureProtos.CreateNamespaceStateData.newBuilder()
.setNamespaceDescriptor(ProtobufUtil.toProtoNamespaceDescriptor(this.nsDescriptor));
serializer.serialize(createNamespaceMsg.build());
}
@Override
protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {
super.deserializeStateData(serializer);
MasterProcedureProtos.CreateNamespaceStateData createNamespaceMsg =
serializer.deserialize(MasterProcedureProtos.CreateNamespaceStateData.class);
nsDescriptor = ProtobufUtil.toNamespaceDescriptor(createNamespaceMsg.getNamespaceDescriptor());
}
private boolean isBootstrapNamespace() {
return nsDescriptor.equals(NamespaceDescriptor.DEFAULT_NAMESPACE)
|| nsDescriptor.equals(NamespaceDescriptor.SYSTEM_NAMESPACE);
}
@Override
protected boolean waitInitialized(MasterProcedureEnv env) {
// Namespace manager might not be ready if master is not fully initialized,
// return false to reject user namespace creation; return true for default
// and system namespace creation (this is part of master initialization).
if (isBootstrapNamespace()) {
return false;
}
return env.waitInitialized(this);
}
@Override
protected LockState acquireLock(final MasterProcedureEnv env) {
if (env.getProcedureScheduler().waitNamespaceExclusiveLock(this, getNamespaceName())) {
return LockState.LOCK_EVENT_WAIT;
}
return LockState.LOCK_ACQUIRED;
}
@Override
public TableOperationType getTableOperationType() {
return TableOperationType.EDIT;
}
@Override
protected String getNamespaceName() {
return nsDescriptor.getName();
}
/**
* Action before any real action of creating namespace.
* @param env MasterProcedureEnv
*/
private boolean prepareCreate(final MasterProcedureEnv env) throws IOException {
if (getTableNamespaceManager(env).doesNamespaceExist(nsDescriptor.getName())) {
setFailure("master-create-namespace",
new NamespaceExistException("Namespace " + nsDescriptor.getName() + " already exists"));
return false;
}
getTableNamespaceManager(env).validateTableAndRegionCount(nsDescriptor);
return true;
}
/**
* Create the namespace directory
* @param env MasterProcedureEnv
* @param nsDescriptor NamespaceDescriptor
*/
protected static void createDirectory(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor) throws IOException {
MasterFileSystem mfs = env.getMasterServices().getMasterFileSystem();
mfs.getFileSystem()
.mkdirs(CommonFSUtils.getNamespaceDir(mfs.getRootDir(), nsDescriptor.getName()));
}
/**
* Insert the row into ns table
* @param env MasterProcedureEnv
* @param nsDescriptor NamespaceDescriptor
*/
protected static void insertIntoNSTable(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor) throws IOException {
getTableNamespaceManager(env).insertIntoNSTable(nsDescriptor);
}
/**
* Update ZooKeeper.
* @param env MasterProcedureEnv
* @param nsDescriptor NamespaceDescriptor
*/
protected static void updateZKNamespaceManager(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor) throws IOException {
getTableNamespaceManager(env).updateZKNamespaceManager(nsDescriptor);
}
/**
* Set quota for the namespace
* @param env MasterProcedureEnv
* @param nsDescriptor NamespaceDescriptor
**/
protected static void setNamespaceQuota(final MasterProcedureEnv env,
final NamespaceDescriptor nsDescriptor) throws IOException {
if (env.getMasterServices().isInitialized()) {
env.getMasterServices().getMasterQuotaManager().setNamespaceQuota(nsDescriptor);
}
}
private static TableNamespaceManager getTableNamespaceManager(final MasterProcedureEnv env) {
return env.getMasterServices().getClusterSchema().getTableNamespaceManager();
}
/**
* The procedure could be restarted from a different machine. If the variable is null, we need to
* retrieve it.
*/
private Boolean isTraceEnabled() {
if (traceEnabled == null) {
traceEnabled = LOG.isTraceEnabled();
}
return traceEnabled;
}
@Override
protected boolean shouldWaitClientAck(MasterProcedureEnv env) {
// hbase and default namespaces are created on bootstrap internally by the system
// the client does not know about this procedures.
return !isBootstrapNamespace();
}
}