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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.assignment;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellBuilderFactory;
import org.apache.hadoop.hbase.CellBuilderType;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.RegionLocations;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.master.MasterFileSystem;
import org.apache.hadoop.hbase.master.MasterServices;
import org.apache.hadoop.hbase.master.RegionState.State;
import org.apache.hadoop.hbase.procedure2.Procedure;
import org.apache.hadoop.hbase.procedure2.util.StringUtils;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.wal.WALSplitUtil;
import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
/**
* Store Region State to hbase:meta table.
*/
@InterfaceAudience.Private
public class RegionStateStore {
private static final Logger LOG = LoggerFactory.getLogger(RegionStateStore.class);
private static final Logger METALOG = LoggerFactory.getLogger("org.apache.hadoop.hbase.META");
/** The delimiter for meta columns for replicaIds > 0 */
protected static final char META_REPLICA_ID_DELIMITER = '_';
private final MasterServices master;
public RegionStateStore(final MasterServices master) {
this.master = master;
}
public interface RegionStateVisitor {
void visitRegionState(Result result, RegionInfo regionInfo, State state,
ServerName regionLocation, ServerName lastHost, long openSeqNum);
}
public void visitMeta(final RegionStateVisitor visitor) throws IOException {
MetaTableAccessor.fullScanRegions(master.getConnection(), new MetaTableAccessor.Visitor() {
final boolean isDebugEnabled = LOG.isDebugEnabled();
@Override
public boolean visit(final Result r) throws IOException {
if (r != null && !r.isEmpty()) {
long st = 0;
if (LOG.isTraceEnabled()) {
st = System.currentTimeMillis();
}
visitMetaEntry(visitor, r);
if (LOG.isTraceEnabled()) {
long et = System.currentTimeMillis();
LOG.trace("[T] LOAD META PERF " + StringUtils.humanTimeDiff(et - st));
}
} else if (isDebugEnabled) {
LOG.debug("NULL result from meta - ignoring but this is strange.");
}
return true;
}
});
}
/**
* Queries META table for the passed region encoded name, delegating action upon results to the
* RegionStateVisitor passed as second parameter.
* @param regionEncodedName encoded name for the Region we want to query META for.
* @param visitor The RegionStateVisitor instance to react over the query results.
* @throws IOException If some error occurs while querying META or parsing results.
*/
public void visitMetaForRegion(final String regionEncodedName, final RegionStateVisitor visitor)
throws IOException {
Result result =
MetaTableAccessor.scanByRegionEncodedName(master.getConnection(), regionEncodedName);
if (result != null) {
visitMetaEntry(visitor, result);
}
}
private void visitMetaEntry(final RegionStateVisitor visitor, final Result result)
throws IOException {
final RegionLocations rl = MetaTableAccessor.getRegionLocations(result);
if (rl == null) return;
final HRegionLocation[] locations = rl.getRegionLocations();
if (locations == null) return;
for (int i = 0; i < locations.length; ++i) {
final HRegionLocation hrl = locations[i];
if (hrl == null) continue;
final RegionInfo regionInfo = hrl.getRegion();
if (regionInfo == null) continue;
final int replicaId = regionInfo.getReplicaId();
final State state = getRegionState(result, regionInfo);
final ServerName lastHost = hrl.getServerName();
ServerName regionLocation = MetaTableAccessor.getTargetServerName(result, replicaId);
final long openSeqNum = hrl.getSeqNum();
LOG.debug(
"Load hbase:meta entry region={}, regionState={}, lastHost={}, " +
"regionLocation={}, openSeqNum={}",
regionInfo.getEncodedName(), state, lastHost, regionLocation, openSeqNum);
visitor.visitRegionState(result, regionInfo, state, regionLocation, lastHost, openSeqNum);
}
}
void updateRegionLocation(RegionStateNode regionStateNode) throws IOException {
if (regionStateNode.getRegionInfo().isMetaRegion()) {
updateMetaLocation(regionStateNode.getRegionInfo(), regionStateNode.getRegionLocation(),
regionStateNode.getState());
} else {
long openSeqNum = regionStateNode.getState() == State.OPEN ? regionStateNode.getOpenSeqNum() :
HConstants.NO_SEQNUM;
updateUserRegionLocation(regionStateNode.getRegionInfo(), regionStateNode.getState(),
regionStateNode.getRegionLocation(), openSeqNum,
// The regionStateNode may have no procedure in a test scenario; allow for this.
regionStateNode.getProcedure() != null ? regionStateNode.getProcedure().getProcId() :
Procedure.NO_PROC_ID);
}
}
private void updateMetaLocation(RegionInfo regionInfo, ServerName serverName, State state)
throws IOException {
try {
MetaTableLocator.setMetaLocation(master.getZooKeeper(), serverName, regionInfo.getReplicaId(),
state);
} catch (KeeperException e) {
throw new IOException(e);
}
}
private void updateUserRegionLocation(RegionInfo regionInfo, State state,
ServerName regionLocation, long openSeqNum, long pid) throws IOException {
long time = EnvironmentEdgeManager.currentTime();
final int replicaId = regionInfo.getReplicaId();
final Put put = new Put(MetaTableAccessor.getMetaKeyForRegion(regionInfo), time);
MetaTableAccessor.addRegionInfo(put, regionInfo);
final StringBuilder info =
new StringBuilder("pid=").append(pid).append(" updating hbase:meta row=")
.append(regionInfo.getEncodedName()).append(", regionState=").append(state);
if (openSeqNum >= 0) {
Preconditions.checkArgument(state == State.OPEN && regionLocation != null,
"Open region should be on a server");
MetaTableAccessor.addLocation(put, regionLocation, openSeqNum, replicaId);
// only update replication barrier for default replica
if (regionInfo.getReplicaId() == RegionInfo.DEFAULT_REPLICA_ID &&
hasGlobalReplicationScope(regionInfo.getTable())) {
MetaTableAccessor.addReplicationBarrier(put, openSeqNum);
info.append(", repBarrier=").append(openSeqNum);
}
info.append(", openSeqNum=").append(openSeqNum);
info.append(", regionLocation=").append(regionLocation);
} else if (regionLocation != null) {
// Ideally, if no regionLocation, write null to the hbase:meta but this will confuse clients
// currently; they want a server to hit. TODO: Make clients wait if no location.
put.add(CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(put.getRow())
.setFamily(HConstants.CATALOG_FAMILY)
.setQualifier(MetaTableAccessor.getServerNameColumn(replicaId))
.setTimestamp(put.getTimestamp()).setType(Cell.Type.Put)
.setValue(Bytes.toBytes(regionLocation.getServerName())).build());
info.append(", regionLocation=").append(regionLocation);
}
put.add(CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(put.getRow())
.setFamily(HConstants.CATALOG_FAMILY).setQualifier(getStateColumn(replicaId))
.setTimestamp(put.getTimestamp()).setType(Cell.Type.Put).setValue(Bytes.toBytes(state.name()))
.build());
LOG.info(info.toString());
updateRegionLocation(regionInfo, state, put);
}
private void updateRegionLocation(RegionInfo regionInfo, State state, Put put)
throws IOException {
try (Table table = getMetaTable()) {
debugLogMutation(put);
table.put(put);
} catch (IOException e) {
// TODO: Revist!!!! Means that if a server is loaded, then we will abort our host!
// In tests we abort the Master!
String msg = String.format("FAILED persisting region=%s state=%s",
regionInfo.getShortNameToLog(), state);
LOG.error(msg, e);
master.abort(msg, e);
throw e;
}
}
private long getOpenSeqNumForParentRegion(RegionInfo region) throws IOException {
MasterFileSystem fs = master.getMasterFileSystem();
long maxSeqId = WALSplitUtil.getMaxRegionSequenceId(master.getConfiguration(), region,
fs::getFileSystem, fs::getWALFileSystem);
return maxSeqId > 0 ? maxSeqId + 1 : HConstants.NO_SEQNUM;
}
private Table getMetaTable() throws IOException {
return master.getConnection().getTable(TableName.META_TABLE_NAME);
}
// ============================================================================================
// Update Region Splitting State helpers
// ============================================================================================
public void splitRegion(RegionInfo parent, RegionInfo hriA, RegionInfo hriB,
ServerName serverName) throws IOException {
TableDescriptor htd = getTableDescriptor(parent.getTable());
long parentOpenSeqNum = HConstants.NO_SEQNUM;
if (htd.hasGlobalReplicationScope()) {
parentOpenSeqNum = getOpenSeqNumForParentRegion(parent);
}
MetaTableAccessor.splitRegion(master.getConnection(), parent, parentOpenSeqNum, hriA, hriB,
serverName, getRegionReplication(htd));
}
// ============================================================================================
// Update Region Merging State helpers
// ============================================================================================
public void mergeRegions(RegionInfo child, RegionInfo [] parents, ServerName serverName)
throws IOException {
TableDescriptor htd = getTableDescriptor(child.getTable());
boolean globalScope = htd.hasGlobalReplicationScope();
SortedMap parentSeqNums = new TreeMap<>();
for (RegionInfo ri: parents) {
parentSeqNums.put(ri, globalScope? getOpenSeqNumForParentRegion(ri): -1);
}
MetaTableAccessor.mergeRegions(master.getConnection(), child, parentSeqNums,
serverName, getRegionReplication(htd));
}
// ============================================================================================
// Delete Region State helpers
// ============================================================================================
public void deleteRegion(final RegionInfo regionInfo) throws IOException {
deleteRegions(Collections.singletonList(regionInfo));
}
public void deleteRegions(final List regions) throws IOException {
MetaTableAccessor.deleteRegionInfos(master.getConnection(), regions);
}
private Scan getScanForUpdateRegionReplicas(TableName tableName) {
return MetaTableAccessor.getScanForTableName(master.getConfiguration(), tableName)
.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
}
public void removeRegionReplicas(TableName tableName, int oldReplicaCount, int newReplicaCount)
throws IOException {
if (TableName.isMetaTableName(tableName)) {
ZKWatcher zk = master.getZooKeeper();
try {
for (int i = newReplicaCount; i < oldReplicaCount; i++) {
ZKUtil.deleteNode(zk, zk.getZNodePaths().getZNodeForReplica(i));
}
} catch (KeeperException e) {
throw new IOException(e);
}
} else {
Scan scan = getScanForUpdateRegionReplicas(tableName);
List deletes = new ArrayList<>();
long now = EnvironmentEdgeManager.currentTime();
try (Table metaTable = getMetaTable(); ResultScanner scanner = metaTable.getScanner(scan)) {
for (;;) {
Result result = scanner.next();
if (result == null) {
break;
}
RegionInfo primaryRegionInfo = MetaTableAccessor.getRegionInfo(result);
if (primaryRegionInfo == null || primaryRegionInfo.isSplitParent()) {
continue;
}
Delete delete = new Delete(result.getRow());
for (int i = newReplicaCount; i < oldReplicaCount; i++) {
delete.addColumns(HConstants.CATALOG_FAMILY, MetaTableAccessor.getServerColumn(i),
now);
delete.addColumns(HConstants.CATALOG_FAMILY, MetaTableAccessor.getSeqNumColumn(i),
now);
delete.addColumns(HConstants.CATALOG_FAMILY, MetaTableAccessor.getStartCodeColumn(i),
now);
delete.addColumns(HConstants.CATALOG_FAMILY, MetaTableAccessor.getServerNameColumn(i),
now);
delete.addColumns(HConstants.CATALOG_FAMILY,
MetaTableAccessor.getRegionStateColumn(i), now);
}
deletes.add(delete);
}
debugLogMutations(deletes);
metaTable.delete(deletes);
}
}
}
// ==========================================================================
// Table Descriptors helpers
// ==========================================================================
private boolean hasGlobalReplicationScope(TableName tableName) throws IOException {
return hasGlobalReplicationScope(getTableDescriptor(tableName));
}
private boolean hasGlobalReplicationScope(TableDescriptor htd) {
return htd != null ? htd.hasGlobalReplicationScope() : false;
}
private int getRegionReplication(TableDescriptor htd) {
return htd != null ? htd.getRegionReplication() : 1;
}
private TableDescriptor getTableDescriptor(TableName tableName) throws IOException {
return master.getTableDescriptors().get(tableName);
}
// ==========================================================================
// Region State
// ==========================================================================
/**
* Pull the region state from a catalog table {@link Result}.
* @return the region state, or null if unknown.
*/
public static State getRegionState(final Result r, RegionInfo regionInfo) {
Cell cell =
r.getColumnLatestCell(HConstants.CATALOG_FAMILY, getStateColumn(regionInfo.getReplicaId()));
if (cell == null || cell.getValueLength() == 0) {
return null;
}
String state =
Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
try {
return State.valueOf(state);
} catch (IllegalArgumentException e) {
LOG.warn(
"BAD value {} in hbase:meta info:state column for region {} , " +
"Consider using HBCK2 setRegionState ENCODED_REGION_NAME STATE",
state, regionInfo.getEncodedName());
return null;
}
}
private static byte[] getStateColumn(int replicaId) {
return replicaId == 0 ? HConstants.STATE_QUALIFIER :
Bytes.toBytes(HConstants.STATE_QUALIFIER_STR + META_REPLICA_ID_DELIMITER +
String.format(RegionInfo.REPLICA_ID_FORMAT, replicaId));
}
private static void debugLogMutations(List mutations) throws IOException {
if (!METALOG.isDebugEnabled()) {
return;
}
// Logging each mutation in separate line makes it easier to see diff between them visually
// because of common starting indentation.
for (Mutation mutation : mutations) {
debugLogMutation(mutation);
}
}
private static void debugLogMutation(Mutation p) throws IOException {
METALOG.debug("{} {}", p.getClass().getSimpleName(), p.toJSON());
}
}
