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HBASE-7565 [replication] Create an interface for the replication state node 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1435250 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2013-01-18 17:02:28 +00:00
parent 832b85e8e3
commit 0c9a81436e
5 changed files with 240 additions and 75 deletions
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2
hbase-server/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
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@ -185,7 +185,7 @@ public class ReplicationAdmin implements Closeable {
boolean prev = true;
try {
prev = getReplicating();
this.replicationZk.setReplicating(newState);
this.replicationZk.setReplication(newState);
} catch (KeeperException e) {
throw new IOException("Unable to set the replication state", e);
}

2
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java
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@ -90,7 +90,7 @@ public class ReplicationPeer implements Abortable, Closeable {
}
private void readPeerStateZnode() throws DeserializationException {
this.peerEnabled.set(ReplicationZookeeper.isPeerEnabled(this.peerStateTracker.getData(false)));
this.peerEnabled.set(ReplicationZookeeper.isStateEnabled(this.peerStateTracker.getData(false)));
}
/**

167
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateImpl.java Normal file
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@ -0,0 +1,167 @@
/*
*
* 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.replication;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.Abortable;
import org.apache.hadoop.hbase.DeserializationException;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;
import com.google.protobuf.InvalidProtocolBufferException;
/**
* ReplicationStateImpl is responsible for maintaining the replication state
* znode.
*/
public class ReplicationStateImpl implements ReplicationStateInterface {
private ReplicationStateTracker stateTracker;
private final String stateZnode;
private final ZooKeeperWatcher zookeeper;
private final Abortable abortable;
private final AtomicBoolean replicating;
private static final Log LOG = LogFactory.getLog(ReplicationStateImpl.class);
public ReplicationStateImpl(final ZooKeeperWatcher zk, final String stateZnode,
final Abortable abortable, final AtomicBoolean replicating) {
this.zookeeper = zk;
this.stateZnode = stateZnode;
this.abortable = abortable;
this.replicating = replicating;
// Set a tracker on replicationStateNode
this.stateTracker = new ReplicationStateTracker(this.zookeeper, this.stateZnode,
this.abortable);
stateTracker.start();
readReplicationStateZnode();
}
public boolean getState() throws KeeperException {
return getReplication();
}
public void setState(boolean newState) throws KeeperException {
setReplicating(newState);
}
@Override
public void close() throws IOException {
if (stateTracker != null) stateTracker.stop();
}
/**
* @param bytes
* @return True if the passed in <code>bytes</code> are those of a pb
* serialized ENABLED state.
* @throws DeserializationException
*/
private boolean isStateEnabled(final byte[] bytes) throws DeserializationException {
ZooKeeperProtos.ReplicationState.State state = parseStateFrom(bytes);
return ZooKeeperProtos.ReplicationState.State.ENABLED == state;
}
/**
* @param bytes Content of a state znode.
* @return State parsed from the passed bytes.
* @throws DeserializationException
*/
private ZooKeeperProtos.ReplicationState.State parseStateFrom(final byte[] bytes)
throws DeserializationException {
ProtobufUtil.expectPBMagicPrefix(bytes);
int pblen = ProtobufUtil.lengthOfPBMagic();
ZooKeeperProtos.ReplicationState.Builder builder = ZooKeeperProtos.ReplicationState
.newBuilder();
ZooKeeperProtos.ReplicationState state;
try {
state = builder.mergeFrom(bytes, pblen, bytes.length - pblen).build();
return state.getState();
} catch (InvalidProtocolBufferException e) {
throw new DeserializationException(e);
}
}
/**
* Set the new replication state for this cluster
* @param newState
*/
private void setReplicating(boolean newState) throws KeeperException {
ZKUtil.createWithParents(this.zookeeper, this.stateZnode);
byte[] stateBytes = (newState == true) ? ReplicationZookeeper.ENABLED_ZNODE_BYTES
: ReplicationZookeeper.DISABLED_ZNODE_BYTES;
ZKUtil.setData(this.zookeeper, this.stateZnode, stateBytes);
}
/**
* Get the replication status of this cluster. If the state znode doesn't
* exist it will also create it and set it true.
* @return returns true when it's enabled, else false
* @throws KeeperException
*/
private boolean getReplication() throws KeeperException {
byte[] data = this.stateTracker.getData(false);
if (data == null || data.length == 0) {
setReplicating(true);
return true;
}
try {
return isStateEnabled(data);
} catch (DeserializationException e) {
throw ZKUtil.convert(e);
}
}
/**
* This reads the state znode for replication and sets the atomic boolean
*/
private void readReplicationStateZnode() {
try {
this.replicating.set(getReplication());
LOG.info("Replication is now " + (this.replicating.get() ? "started" : "stopped"));
} catch (KeeperException e) {
this.abortable.abort("Failed getting data on from " + this.stateZnode, e);
}
}
/**
* Tracker for status of the replication
*/
private class ReplicationStateTracker extends ZooKeeperNodeTracker {
public ReplicationStateTracker(ZooKeeperWatcher watcher, String stateZnode, Abortable abortable) {
super(watcher, stateZnode, abortable);
}
@Override
public synchronized void nodeDataChanged(String path) {
if (path.equals(node)) {
super.nodeDataChanged(path);
readReplicationStateZnode();
}
}
}
}

47
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateInterface.java Normal file
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@ -0,0 +1,47 @@
/*
*
* 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.replication;
import java.io.Closeable;
import org.apache.zookeeper.KeeperException;
/**
* This provides an interface for getting and setting the replication state of a
* cluster. This state is used to indicate whether replication is enabled or
* disabled on a cluster.
*/
public interface ReplicationStateInterface extends Closeable {
/**
* Get the current state of replication (i.e. ENABLED or DISABLED).
*
* @return true if replication is enabled, false otherwise
* @throws KeeperException
*/
public boolean getState() throws KeeperException;
/**
* Set the state of replication.
*
* @param newState
* @throws KeeperException
*/
public void setState(boolean newState) throws KeeperException;
}

97
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/ReplicationZookeeper.java
View File

@ -43,12 +43,10 @@ import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos;
import org.apache.hadoop.hbase.replication.regionserver.Replication;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.KeeperException.ConnectionLossException;
@ -87,7 +85,7 @@ import com.google.protobuf.InvalidProtocolBufferException;
* </pre>
*/
@InterfaceAudience.Private
public class ReplicationZookeeper implements Closeable{
public class ReplicationZookeeper implements Closeable {
private static final Log LOG =
LogFactory.getLog(ReplicationZookeeper.class);
// Name of znode we use to lock when failover
@ -111,24 +109,24 @@ public class ReplicationZookeeper implements Closeable{
// peers' id node; e.g. /hbase/replication/peers/PEER_ID/peer-state
private String peerStateNodeName;
private final Configuration conf;
// Is this cluster replicating at the moment?
private AtomicBoolean replicating;
// The key to our own cluster
private String ourClusterKey;
// Abortable
private Abortable abortable;
private ReplicationStatusTracker statusTracker;
private final ReplicationStateInterface replicationState;
/**
* ZNode content if enabled state.
*/
// Public so it can be seen by test code.
public static final byte[] ENABLED_ZNODE_BYTES = toByteArray(ZooKeeperProtos.ReplicationState.State.ENABLED);
public static final byte[] ENABLED_ZNODE_BYTES =
toByteArray(ZooKeeperProtos.ReplicationState.State.ENABLED);
/**
* ZNode content if disabled state.
*/
static final byte[] DISABLED_ZNODE_BYTES = toByteArray(ZooKeeperProtos.ReplicationState.State.DISABLED);
static final byte[] DISABLED_ZNODE_BYTES =
toByteArray(ZooKeeperProtos.ReplicationState.State.DISABLED);
/**
* Constructor used by clients of replication (like master and HBase clients)
@ -140,8 +138,9 @@ public class ReplicationZookeeper implements Closeable{
final ZooKeeperWatcher zk) throws KeeperException {
this.conf = conf;
this.zookeeper = zk;
this.replicating = new AtomicBoolean();
setZNodes(abortable);
this.replicationState =
new ReplicationStateImpl(this.zookeeper, getRepStateNode(), abortable, new AtomicBoolean());
}
/**
@ -157,9 +156,10 @@ public class ReplicationZookeeper implements Closeable{
this.abortable = server;
this.zookeeper = server.getZooKeeper();
this.conf = server.getConfiguration();
this.replicating = replicating;
setZNodes(server);
this.replicationState =
new ReplicationStateImpl(this.zookeeper, getRepStateNode(), server, replicating);
this.peerClusters = new HashMap<String, ReplicationPeer>();
ZKUtil.createWithParents(this.zookeeper,
ZKUtil.joinZNode(this.replicationZNode, this.replicationStateNodeName));
@ -180,11 +180,6 @@ public class ReplicationZookeeper implements Closeable{
ZKUtil.createWithParents(this.zookeeper, this.peersZNode);
this.rsZNode = ZKUtil.joinZNode(replicationZNode, rsZNodeName);
ZKUtil.createWithParents(this.zookeeper, this.rsZNode);
// Set a tracker on replicationStateNodeNode
this.statusTracker = new ReplicationStatusTracker(this.zookeeper, abortable);
statusTracker.start();
readReplicationStateZnode();
}
private void connectExistingPeers() throws IOException, KeeperException {
@ -365,18 +360,6 @@ public class ReplicationZookeeper implements Closeable{
return peer;
}
/**
* Set the new replication state for this cluster
* @param newState
*/
public void setReplicating(boolean newState) throws KeeperException {
ZKUtil.createWithParents(this.zookeeper,
ZKUtil.joinZNode(this.replicationZNode, this.replicationStateNodeName));
byte[] stateBytes = (newState == true) ? ENABLED_ZNODE_BYTES : DISABLED_ZNODE_BYTES;
ZKUtil.setData(this.zookeeper,
ZKUtil.joinZNode(this.replicationZNode, this.replicationStateNodeName), stateBytes);
}
/**
* Remove the peer from zookeeper. which will trigger the watchers on every
* region server and close their sources
@ -641,40 +624,27 @@ public class ReplicationZookeeper implements Closeable{
return ZKUtil.joinZNode(this.peersZNode, ZKUtil.joinZNode(id, this.peerStateNodeName));
}
/**
* This reads the state znode for replication and sets the atomic boolean
*/
private void readReplicationStateZnode() {
try {
this.replicating.set(getReplication());
LOG.info("Replication is now " + (this.replicating.get()?
"started" : "stopped"));
} catch (KeeperException e) {
this.abortable.abort("Failed getting data on from " + getRepStateNode(), e);
}
private String getRepStateNode() {
return ZKUtil.joinZNode(this.replicationZNode, this.replicationStateNodeName);
}
/**
* Get the replication status of this cluster. If the state znode doesn't
* exist it will also create it and set it true.
* Get the replication status of this cluster. If the state znode doesn't exist it will also
* create it and set it true.
* @return returns true when it's enabled, else false
* @throws KeeperException
*/
public boolean getReplication() throws KeeperException {
byte [] data = this.statusTracker.getData(false);
if (data == null || data.length == 0) {
setReplicating(true);
return true;
}
try {
return isPeerEnabled(data);
} catch (DeserializationException e) {
throw ZKUtil.convert(e);
}
return this.replicationState.getState();
}
private String getRepStateNode() {
return ZKUtil.joinZNode(this.replicationZNode, this.replicationStateNodeName);
/**
* Set the new replication state for this cluster
* @param newState
* @throws KeeperException
*/
public void setReplication(boolean newState) throws KeeperException {
this.replicationState.setState(newState);
}
/**
@ -1055,8 +1025,7 @@ public class ReplicationZookeeper implements Closeable{
@Override
public void close() throws IOException {
if (statusTracker != null)
statusTracker.stop();
if (replicationState != null) replicationState.close();
}
/**
@ -1086,26 +1055,8 @@ public class ReplicationZookeeper implements Closeable{
* serialized ENABLED state.
* @throws DeserializationException
*/
static boolean isPeerEnabled(final byte[] bytes) throws DeserializationException {
static boolean isStateEnabled(final byte[] bytes) throws DeserializationException {
ZooKeeperProtos.ReplicationState.State state = parseStateFrom(bytes);
return ZooKeeperProtos.ReplicationState.State.ENABLED == state;
}
/**
* Tracker for status of the replication
*/
public class ReplicationStatusTracker extends ZooKeeperNodeTracker {
public ReplicationStatusTracker(ZooKeeperWatcher watcher,
Abortable abortable) {
super(watcher, getRepStateNode(), abortable);
}
@Override
public synchronized void nodeDataChanged(String path) {
if (path.equals(node)) {
super.nodeDataChanged(path);
readReplicationStateZnode();
}
}
}
}