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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.hbase;
import java.io.IOException;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SplitLogTask.RecoveryMode;
import org.apache.hadoop.hbase.util.Bytes;
/**
* State of a WAL log split during distributed splitting. State is kept up in zookeeper.
* Encapsulates protobuf serialization/deserialization so we don't leak generated pb outside of
* this class. Used by regionserver and master packages.
* Immutable
*/
@InterfaceAudience.Private
public class SplitLogTask {
private final ServerName originServer;
private final ZooKeeperProtos.SplitLogTask.State state;
private final ZooKeeperProtos.SplitLogTask.RecoveryMode mode;
public static class Unassigned extends SplitLogTask {
public Unassigned(final ServerName originServer, final RecoveryMode mode) {
super(originServer, ZooKeeperProtos.SplitLogTask.State.UNASSIGNED, mode);
}
}
public static class Owned extends SplitLogTask {
public Owned(final ServerName originServer, final RecoveryMode mode) {
super(originServer, ZooKeeperProtos.SplitLogTask.State.OWNED, mode);
}
}
public static class Resigned extends SplitLogTask {
public Resigned(final ServerName originServer, final RecoveryMode mode) {
super(originServer, ZooKeeperProtos.SplitLogTask.State.RESIGNED, mode);
}
}
public static class Done extends SplitLogTask {
public Done(final ServerName originServer, final RecoveryMode mode) {
super(originServer, ZooKeeperProtos.SplitLogTask.State.DONE, mode);
}
}
public static class Err extends SplitLogTask {
public Err(final ServerName originServer, final RecoveryMode mode) {
super(originServer, ZooKeeperProtos.SplitLogTask.State.ERR, mode);
}
}
SplitLogTask(final ZooKeeperProtos.SplitLogTask slt) {
this.originServer = ProtobufUtil.toServerName(slt.getServerName());
this.state = slt.getState();
this.mode = (slt.hasMode()) ? slt.getMode() :
ZooKeeperProtos.SplitLogTask.RecoveryMode.UNKNOWN;
}
SplitLogTask(final ServerName originServer, final ZooKeeperProtos.SplitLogTask.State state,
final ZooKeeperProtos.SplitLogTask.RecoveryMode mode) {
this.originServer = originServer;
this.state = state;
this.mode = mode;
}
public ServerName getServerName() {
return this.originServer;
}
public ZooKeeperProtos.SplitLogTask.RecoveryMode getMode() {
return this.mode;
}
public boolean isUnassigned(final ServerName sn) {
return this.originServer.equals(sn) && isUnassigned();
}
public boolean isUnassigned() {
return this.state == ZooKeeperProtos.SplitLogTask.State.UNASSIGNED;
}
public boolean isOwned(final ServerName sn) {
return this.originServer.equals(sn) && isOwned();
}
public boolean isOwned() {
return this.state == ZooKeeperProtos.SplitLogTask.State.OWNED;
}
public boolean isResigned(final ServerName sn) {
return this.originServer.equals(sn) && isResigned();
}
public boolean isResigned() {
return this.state == ZooKeeperProtos.SplitLogTask.State.RESIGNED;
}
public boolean isDone(final ServerName sn) {
return this.originServer.equals(sn) && isDone();
}
public boolean isDone() {
return this.state == ZooKeeperProtos.SplitLogTask.State.DONE;
}
public boolean isErr(final ServerName sn) {
return this.originServer.equals(sn) && isErr();
}
public boolean isErr() {
return this.state == ZooKeeperProtos.SplitLogTask.State.ERR;
}
@Override
public String toString() {
return this.state.toString() + " " + this.originServer.toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof SplitLogTask)) return false;
SplitLogTask other = (SplitLogTask)obj;
return other.state.equals(this.state) && other.originServer.equals(this.originServer);
}
@Override
public int hashCode() {
int hash = 7;
hash = 31 * hash + this.state.hashCode();
return 31 * hash + this.originServer.hashCode();
}
/**
* @param data Serialized date to parse.
* @return An SplitLogTaskState instance made of the passed data
* @throws DeserializationException
* @see #toByteArray()
*/
public static SplitLogTask parseFrom(final byte [] data) throws DeserializationException {
ProtobufUtil.expectPBMagicPrefix(data);
try {
int prefixLen = ProtobufUtil.lengthOfPBMagic();
ZooKeeperProtos.SplitLogTask.Builder builder = ZooKeeperProtos.SplitLogTask.newBuilder();
ProtobufUtil.mergeFrom(builder, data, prefixLen, data.length - prefixLen);
return new SplitLogTask(builder.build());
} catch (IOException e) {
throw new DeserializationException(Bytes.toStringBinary(data, 0, 64), e);
}
}
/**
* @return This instance serialized into a byte array
* @see #parseFrom(byte[])
*/
public byte [] toByteArray() {
// First create a pb ServerName. Then create a ByteString w/ the TaskState
// bytes in it. Finally create a SplitLogTaskState passing in the two
// pbs just created.
HBaseProtos.ServerName snpb = ProtobufUtil.toServerName(this.originServer);
ZooKeeperProtos.SplitLogTask slts =
ZooKeeperProtos.SplitLogTask.newBuilder().setServerName(snpb).setState(this.state).
setMode(this.mode).build();
return ProtobufUtil.prependPBMagic(slts.toByteArray());
}
}