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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.master;
import java.util.Date;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.ClusterStatusProtos;
/**
* State of a Region while undergoing transitions.
* This class is immutable.
*/
@InterfaceAudience.Private
public class RegionState {
@InterfaceAudience.Private
@InterfaceStability.Evolving
public enum State {
OFFLINE, // region is in an offline state
OPENING, // server has begun to open but not yet done
OPEN, // server opened region and updated meta
CLOSING, // server has begun to close but not yet done
CLOSED, // server closed region and updated meta
SPLITTING, // server started split of a region
SPLIT, // server completed split of a region
FAILED_OPEN, // failed to open, and won't retry any more
FAILED_CLOSE, // failed to close, and won't retry any more
MERGING, // server started merge a region
MERGED, // server completed merge a region
SPLITTING_NEW, // new region to be created when RS splits a parent
// region but hasn't be created yet, or master doesn't
// know it's already created
MERGING_NEW, // new region to be created when RS merges two
// daughter regions but hasn't be created yet, or
// master doesn't know it's already created
ABNORMALLY_CLOSED; // the region is CLOSED because of a RS crashes. Usually it is the same
// with CLOSED, but for some operations such as merge/split, we can not
// apply it to a region in this state, as it may lead to data loss as we
// may have some data in recovered edits.
public boolean matches(State... expected) {
for (State state : expected) {
if (this == state) {
return true;
}
}
return false;
}
/**
* Convert to protobuf ClusterStatusProtos.RegionState.State
*/
public ClusterStatusProtos.RegionState.State convert() {
ClusterStatusProtos.RegionState.State rs;
switch (this) {
case OFFLINE:
rs = ClusterStatusProtos.RegionState.State.OFFLINE;
break;
case OPENING:
rs = ClusterStatusProtos.RegionState.State.OPENING;
break;
case OPEN:
rs = ClusterStatusProtos.RegionState.State.OPEN;
break;
case CLOSING:
rs = ClusterStatusProtos.RegionState.State.CLOSING;
break;
case CLOSED:
rs = ClusterStatusProtos.RegionState.State.CLOSED;
break;
case SPLITTING:
rs = ClusterStatusProtos.RegionState.State.SPLITTING;
break;
case SPLIT:
rs = ClusterStatusProtos.RegionState.State.SPLIT;
break;
case FAILED_OPEN:
rs = ClusterStatusProtos.RegionState.State.FAILED_OPEN;
break;
case FAILED_CLOSE:
rs = ClusterStatusProtos.RegionState.State.FAILED_CLOSE;
break;
case MERGING:
rs = ClusterStatusProtos.RegionState.State.MERGING;
break;
case MERGED:
rs = ClusterStatusProtos.RegionState.State.MERGED;
break;
case SPLITTING_NEW:
rs = ClusterStatusProtos.RegionState.State.SPLITTING_NEW;
break;
case MERGING_NEW:
rs = ClusterStatusProtos.RegionState.State.MERGING_NEW;
break;
case ABNORMALLY_CLOSED:
rs = ClusterStatusProtos.RegionState.State.ABNORMALLY_CLOSED;
break;
default:
throw new IllegalStateException("");
}
return rs;
}
/**
* Convert a protobuf HBaseProtos.RegionState.State to a RegionState.State
*
* @return the RegionState.State
*/
public static State convert(ClusterStatusProtos.RegionState.State protoState) {
State state;
switch (protoState) {
case OFFLINE:
state = OFFLINE;
break;
case PENDING_OPEN:
case OPENING:
state = OPENING;
break;
case OPEN:
state = OPEN;
break;
case PENDING_CLOSE:
case CLOSING:
state = CLOSING;
break;
case CLOSED:
state = CLOSED;
break;
case SPLITTING:
state = SPLITTING;
break;
case SPLIT:
state = SPLIT;
break;
case FAILED_OPEN:
state = FAILED_OPEN;
break;
case FAILED_CLOSE:
state = FAILED_CLOSE;
break;
case MERGING:
state = MERGING;
break;
case MERGED:
state = MERGED;
break;
case SPLITTING_NEW:
state = SPLITTING_NEW;
break;
case MERGING_NEW:
state = MERGING_NEW;
break;
case ABNORMALLY_CLOSED:
state = ABNORMALLY_CLOSED;
break;
default:
throw new IllegalStateException("Unhandled state " + protoState);
}
return state;
}
}
private final long stamp;
private final RegionInfo hri;
private final ServerName serverName;
private final State state;
// The duration of region in transition
private long ritDuration;
public static RegionState createForTesting(RegionInfo region, State state) {
return new RegionState(region, state, System.currentTimeMillis(), null);
}
public RegionState(RegionInfo region, State state, ServerName serverName) {
this(region, state, System.currentTimeMillis(), serverName);
}
public RegionState(RegionInfo region,
State state, long stamp, ServerName serverName) {
this(region, state, stamp, serverName, 0);
}
public RegionState(RegionInfo region, State state, long stamp, ServerName serverName,
long ritDuration) {
this.hri = region;
this.state = state;
this.stamp = stamp;
this.serverName = serverName;
this.ritDuration = ritDuration;
}
public State getState() {
return state;
}
public long getStamp() {
return stamp;
}
public RegionInfo getRegion() {
return hri;
}
public ServerName getServerName() {
return serverName;
}
public long getRitDuration() {
return ritDuration;
}
/**
* Update the duration of region in transition
* @param previousStamp previous RegionState's timestamp
*/
@InterfaceAudience.Private
void updateRitDuration(long previousStamp) {
this.ritDuration += (this.stamp - previousStamp);
}
public boolean isClosing() {
return state == State.CLOSING;
}
public boolean isClosed() {
return state == State.CLOSED;
}
public boolean isClosedOrAbnormallyClosed() {
return isClosed() || this.state == State.ABNORMALLY_CLOSED;
}
public boolean isOpening() {
return state == State.OPENING;
}
public boolean isOpened() {
return state == State.OPEN;
}
public boolean isOffline() {
return state == State.OFFLINE;
}
public boolean isSplitting() {
return state == State.SPLITTING;
}
public boolean isSplit() {
return state == State.SPLIT;
}
public boolean isSplittingNew() {
return state == State.SPLITTING_NEW;
}
public boolean isFailedOpen() {
return state == State.FAILED_OPEN;
}
public boolean isFailedClose() {
return state == State.FAILED_CLOSE;
}
public boolean isMerging() {
return state == State.MERGING;
}
public boolean isMerged() {
return state == State.MERGED;
}
public boolean isMergingNew() {
return state == State.MERGING_NEW;
}
public boolean isOnServer(final ServerName sn) {
return serverName != null && serverName.equals(sn);
}
public boolean isMergingOnServer(final ServerName sn) {
return isOnServer(sn) && isMerging();
}
public boolean isMergingNewOnServer(final ServerName sn) {
return isOnServer(sn) && isMergingNew();
}
public boolean isMergingNewOrOpenedOnServer(final ServerName sn) {
return isOnServer(sn) && (isMergingNew() || isOpened());
}
public boolean isMergingNewOrOfflineOnServer(final ServerName sn) {
return isOnServer(sn) && (isMergingNew() || isOffline());
}
public boolean isSplittingOnServer(final ServerName sn) {
return isOnServer(sn) && isSplitting();
}
public boolean isSplittingNewOnServer(final ServerName sn) {
return isOnServer(sn) && isSplittingNew();
}
public boolean isSplittingOrOpenedOnServer(final ServerName sn) {
return isOnServer(sn) && (isSplitting() || isOpened());
}
public boolean isSplittingOrSplitOnServer(final ServerName sn) {
return isOnServer(sn) && (isSplitting() || isSplit());
}
public boolean isClosingOrClosedOnServer(final ServerName sn) {
return isOnServer(sn) && (isClosing() || isClosed());
}
public boolean isOpeningOrFailedOpenOnServer(final ServerName sn) {
return isOnServer(sn) && (isOpening() || isFailedOpen());
}
public boolean isOpeningOrOpenedOnServer(final ServerName sn) {
return isOnServer(sn) && (isOpening() || isOpened());
}
public boolean isOpenedOnServer(final ServerName sn) {
return isOnServer(sn) && isOpened();
}
/**
* Check if a region state can transition to offline
*/
public boolean isReadyToOffline() {
return isMerged() || isSplit() || isOffline()
|| isSplittingNew() || isMergingNew();
}
/**
* Check if a region state can transition to online
*/
public boolean isReadyToOnline() {
return isOpened() || isSplittingNew() || isMergingNew();
}
/**
* Check if a region state is one of offline states that
* can't transition to pending_close/closing (unassign/offline)
*/
public boolean isUnassignable() {
return isUnassignable(state);
}
/**
* Check if a region state is one of offline states that
* can't transition to pending_close/closing (unassign/offline)
*/
public static boolean isUnassignable(State state) {
return state == State.MERGED || state == State.SPLIT || state == State.OFFLINE
|| state == State.SPLITTING_NEW || state == State.MERGING_NEW;
}
@Override
public String toString() {
return "{" + hri.getShortNameToLog()
+ " state=" + state
+ ", ts=" + stamp
+ ", server=" + serverName + "}";
}
/**
* A slower (but more easy-to-read) stringification
*/
public String toDescriptiveString() {
long relTime = System.currentTimeMillis() - stamp;
return hri.getRegionNameAsString()
+ " state=" + state
+ ", ts=" + new Date(stamp) + " (" + (relTime/1000) + "s ago)"
+ ", server=" + serverName;
}
/**
* Convert a RegionState to an HBaseProtos.RegionState
*
* @return the converted HBaseProtos.RegionState
*/
public ClusterStatusProtos.RegionState convert() {
ClusterStatusProtos.RegionState.Builder regionState = ClusterStatusProtos.RegionState.newBuilder();
regionState.setRegionInfo(ProtobufUtil.toRegionInfo(hri));
regionState.setState(state.convert());
regionState.setStamp(getStamp());
return regionState.build();
}
/**
* Convert a protobuf HBaseProtos.RegionState to a RegionState
*
* @return the RegionState
*/
public static RegionState convert(ClusterStatusProtos.RegionState proto) {
return new RegionState(ProtobufUtil.toRegionInfo(proto.getRegionInfo()),
State.convert(proto.getState()), proto.getStamp(), null);
}
/**
* Check if two states are the same, except timestamp
*/
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null || getClass() != obj.getClass()) {
return false;
}
RegionState tmp = (RegionState)obj;
return RegionInfo.COMPARATOR.compare(tmp.hri, hri) == 0 && tmp.state == state
&& ((serverName != null && serverName.equals(tmp.serverName))
|| (tmp.serverName == null && serverName == null));
}
/**
* Don't count timestamp in hash code calculation
*/
@Override
public int hashCode() {
return (serverName != null ? serverName.hashCode() * 11 : 0)
+ hri.hashCode() + 5 * state.ordinal();
}
}
