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HBASE-20752 Make sure the regions are truly reopened after ReopenTableRegionsProcedure

This commit is contained in:
zhangduo 2018-06-21 10:14:57 +08:00
parent bc9f9ae080
commit 7b716c964b
9 changed files with 245 additions and 154 deletions
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17
hbase-client/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/ProtobufUtil.java
View File

@ -57,6 +57,7 @@ import org.apache.hadoop.hbase.ExtendedCellBuilderFactory;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HBaseIOException;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.ServerName;
@ -3130,6 +3131,22 @@ public final class ProtobufUtil {
return rib.build();
}
public static HBaseProtos.RegionLocation toRegionLocation(HRegionLocation loc) {
HBaseProtos.RegionLocation.Builder builder = HBaseProtos.RegionLocation.newBuilder();
builder.setRegionInfo(toRegionInfo(loc.getRegion()));
if (loc.getServerName() != null) {
builder.setServerName(toServerName(loc.getServerName()));
}
builder.setSeqNum(loc.getSeqNum());
return builder.build();
}
public static HRegionLocation toRegionLocation(HBaseProtos.RegionLocation proto) {
org.apache.hadoop.hbase.client.RegionInfo regionInfo = toRegionInfo(proto.getRegionInfo());
ServerName serverName = proto.hasServerName() ? toServerName(proto.getServerName()) : null;
return new HRegionLocation(regionInfo, serverName, proto.getSeqNum());
}
public static List<SnapshotDescription> toSnapshotDescriptionList(
GetCompletedSnapshotsResponse response, Pattern pattern) {
return response.getSnapshotsList().stream().map(ProtobufUtil::createSnapshotDesc)

6
hbase-protocol-shaded/src/main/protobuf/HBase.proto
View File

@ -268,3 +268,9 @@ message FlushedRegionSequenceId {
message FlushedSequenceId {
repeated FlushedRegionSequenceId regionSequenceId = 1;
}
message RegionLocation {
required RegionInfo region_info = 1;
optional ServerName server_name = 2;
required int64 seq_num = 3;
}

5
hbase-protocol-shaded/src/main/protobuf/MasterProcedure.proto
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@ -441,11 +441,14 @@ message DisablePeerStateData {
}
enum ReopenTableRegionsState {
REOPEN_TABLE_REGIONS_REOPEN_ALL_REGIONS = 1;
REOPEN_TABLE_REGIONS_GET_REGIONS = 1;
REOPEN_TABLE_REGIONS_REOPEN_REGIONS = 2;
REOPEN_TABLE_REGIONS_CONFIRM_REOPENED = 3;
}
message ReopenTableRegionsStateData {
required TableName table_name = 1;
repeated RegionLocation region = 2;
}
enum InitMetaState {

21
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
View File

@ -695,18 +695,6 @@ public class AssignmentManager implements ServerListener {
return procs.toArray(UNASSIGN_PROCEDURE_ARRAY_TYPE);
}
public MoveRegionProcedure[] createReopenProcedures(final Collection<RegionInfo> regionInfo)
throws IOException {
final MoveRegionProcedure[] procs = new MoveRegionProcedure[regionInfo.size()];
int index = 0;
for (RegionInfo hri: regionInfo) {
final ServerName serverName = regionStates.getRegionServerOfRegion(hri);
final RegionPlan plan = new RegionPlan(hri, serverName, serverName);
procs[index++] = createMoveRegionProcedure(plan);
}
return procs;
}
/**
* Called by things like DisableTableProcedure to get a list of UnassignProcedure
* to unassign the regions of the table.
@ -745,14 +733,13 @@ public class AssignmentManager implements ServerListener {
return proc;
}
public MoveRegionProcedure createMoveRegionProcedure(final RegionPlan plan)
throws HBaseIOException {
private MoveRegionProcedure createMoveRegionProcedure(RegionPlan plan) throws HBaseIOException {
if (plan.getRegionInfo().getTable().isSystemTable()) {
List<ServerName> exclude = getExcludedServersForSystemTable();
if (plan.getDestination() != null && exclude.contains(plan.getDestination())) {
try {
LOG.info("Can not move " + plan.getRegionInfo() + " to " + plan.getDestination()
+ " because the server is not with highest version");
LOG.info("Can not move " + plan.getRegionInfo() + " to " + plan.getDestination() +
" because the server is not with highest version");
plan.setDestination(getBalancer().randomAssignment(plan.getRegionInfo(),
this.master.getServerManager().createDestinationServersList(exclude)));
} catch (HBaseIOException e) {
@ -760,7 +747,7 @@ public class AssignmentManager implements ServerListener {
}
}
}
return new MoveRegionProcedure(getProcedureEnvironment(), plan);
return new MoveRegionProcedure(getProcedureEnvironment(), plan, true);
}

13
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/MoveRegionProcedure.java
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@ -56,10 +56,13 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
}
/**
* @throws IOException If the cluster is offline or master is stopping or if table is disabled
* or non-existent.
* @param check whether we should do some checks in the constructor. We will skip the checks if we
* are reopening a region as this may fail the whole procedure and cause stuck. We will
* do the check later when actually executing the procedure so not a big problem.
* @throws IOException If the cluster is offline or master is stopping or if table is disabled or
* non-existent.
*/
public MoveRegionProcedure(final MasterProcedureEnv env, final RegionPlan plan)
public MoveRegionProcedure(MasterProcedureEnv env, RegionPlan plan, boolean check)
throws HBaseIOException {
super(env, plan.getRegionInfo());
this.plan = plan;
@ -70,9 +73,7 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
@Override
protected Flow executeFromState(final MasterProcedureEnv env, final MoveRegionState state)
throws InterruptedException {
if (LOG.isTraceEnabled()) {
LOG.trace(this + " execute state=" + state);
}
LOG.trace("{} execute state={}", this, state);
switch (state) {
case MOVE_REGION_PREPARE:
// Check context again and that region is online; do it here after we have lock on region.

8
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateStore.java
View File

@ -116,11 +116,13 @@ public class RegionStateStore {
final ServerName lastHost = hrl.getServerName();
final ServerName regionLocation = getRegionServer(result, replicaId);
final long openSeqNum = -1;
final long openSeqNum = hrl.getSeqNum();
// TODO: move under trace, now is visible for debugging
LOG.info("Load hbase:meta entry region={}, regionState={}, lastHost={}, " +
"regionLocation={}", regionInfo.getEncodedName(), state, lastHost, regionLocation);
LOG.info(
"Load hbase:meta entry region={}, regionState={}, lastHost={}, " +
"regionLocation={}, openSeqNum={}",
regionInfo.getEncodedName(), state, lastHost, regionLocation, openSeqNum);
visitor.visitRegionState(result, regionInfo, state, regionLocation, lastHost, openSeqNum);
}
}

121
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStates.java
View File

@ -35,8 +35,9 @@ import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.RegionInfo;
@ -49,6 +50,7 @@ import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
/**
@ -570,18 +572,6 @@ public class RegionStates {
return !getTableRegionStates(tableName).isEmpty();
}
/**
* @return Returns regions for a table which are open or about to be open (OPEN or OPENING)
*/
public List<RegionInfo> getOpenRegionsOfTable(final TableName table) {
// We want to get regions which are already open on the cluster or are about to be open.
// The use-case is for identifying regions which need to be re-opened to ensure they see some
// new configuration. Regions in OPENING now are presently being opened by a RS, so we can
// assume that they will imminently be OPEN but may not see our configuration change
return getRegionsOfTable(
table, (state) -> state.isInState(State.OPEN) || state.isInState(State.OPENING));
}
/**
* @return Return online regions of table; does not include OFFLINE or SPLITTING regions.
*/
@ -589,11 +579,99 @@ public class RegionStates {
return getRegionsOfTable(table, false);
}
private HRegionLocation createRegionForReopen(RegionStateNode node) {
synchronized (node) {
if (!include(node, false)) {
return null;
}
if (node.isInState(State.OPEN)) {
return new HRegionLocation(node.getRegionInfo(), node.getRegionLocation(),
node.getOpenSeqNum());
} else if (node.isInState(State.OPENING)) {
return new HRegionLocation(node.getRegionInfo(), node.getRegionLocation(), -1);
} else {
return null;
}
}
}
/**
* Get the regions to be reopened when modifying a table.
* <p/>
* Notice that the {@code openSeqNum} in the returned HRegionLocation is also used to indicate the
* state of this region, positive means the region is in {@link State#OPEN}, -1 means
* {@link State#OPENING}. And for regions in other states we do not need reopen them.
*/
public List<HRegionLocation> getRegionsOfTableForReopen(TableName tableName) {
return getTableRegionStateNodes(tableName).stream().map(this::createRegionForReopen)
.filter(r -> r != null).collect(Collectors.toList());
}
/**
* Check whether the region has been reopened. The meaning of the {@link HRegionLocation} is the
* same with {@link #getRegionsOfTableForReopen(TableName)}.
* <p/>
* For a region which is in {@link State#OPEN} before, if the region state is changed or the open
* seq num is changed, we can confirm that it has been reopened.
* <p/>
* For a region which is in {@link State#OPENING} before, usually it will be in {@link State#OPEN}
* now and we will schedule a MRP to reopen it. But there are several exceptions:
* <ul>
* <li>The region is in state other than {@link State#OPEN} or {@link State#OPENING}.</li>
* <li>The location of the region has been changed</li>
* </ul>
* Of course the region could still be in {@link State#OPENING} state and still on the same
* server, then here we will still return a {@link HRegionLocation} for it, just like
* {@link #getRegionsOfTableForReopen(TableName)}.
* @param oldLoc the previous state/location of this region
* @return null if the region has been reopened, otherwise a new {@link HRegionLocation} which
* means we still need to reopen the region.
* @see #getRegionsOfTableForReopen(TableName)
*/
public HRegionLocation checkReopened(HRegionLocation oldLoc) {
RegionStateNode node = getRegionStateNode(oldLoc.getRegion());
synchronized (node) {
if (oldLoc.getSeqNum() >= 0) {
// in OPEN state before
if (node.isInState(State.OPEN)) {
if (node.getOpenSeqNum() > oldLoc.getSeqNum()) {
// normal case, the region has been reopened
return null;
} else {
// the open seq num does not change, need to reopen again
return new HRegionLocation(node.getRegionInfo(), node.getRegionLocation(),
node.getOpenSeqNum());
}
} else {
// the state has been changed so we can make sure that the region has been reopened(not
// finished maybe, but not a problem).
return null;
}
} else {
// in OPENING state before
if (!node.isInState(State.OPEN, State.OPENING)) {
// not in OPEN or OPENING state, then we can make sure that the region has been
// reopened(not finished maybe, but not a problem)
return null;
} else {
if (!node.getRegionLocation().equals(oldLoc.getServerName())) {
// the region has been moved, so we can make sure that the region has been reopened.
return null;
}
// normal case, we are still in OPENING state, or the reopen has been opened and the state
// is changed to OPEN.
long openSeqNum = node.isInState(State.OPEN) ? node.getOpenSeqNum() : -1;
return new HRegionLocation(node.getRegionInfo(), node.getRegionLocation(), openSeqNum);
}
}
}
}
/**
* @return Return online regions of table; does not include OFFLINE or SPLITTING regions.
*/
public List<RegionInfo> getRegionsOfTable(final TableName table, boolean offline) {
return getRegionsOfTable(table, (state) -> include(state, offline));
public List<RegionInfo> getRegionsOfTable(TableName table, boolean offline) {
return getRegionsOfTable(table, state -> include(state, offline));
}
/**
@ -601,16 +679,9 @@ public class RegionStates {
* <code>offline</code> to true. Does not include regions that are in the
* {@link State#SPLIT} state.
*/
public List<RegionInfo> getRegionsOfTable(
final TableName table, Predicate<RegionStateNode> filter) {
final ArrayList<RegionStateNode> nodes = getTableRegionStateNodes(table);
final ArrayList<RegionInfo> hris = new ArrayList<RegionInfo>(nodes.size());
for (RegionStateNode node: nodes) {
if (filter.test(node)) {
hris.add(node.getRegionInfo());
}
}
return hris;
private List<RegionInfo> getRegionsOfTable(TableName table, Predicate<RegionStateNode> filter) {
return getTableRegionStateNodes(table).stream().filter(filter).map(n -> n.getRegionInfo())
.collect(Collectors.toList());
}
/**

56
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ModifyTableProcedure.java
View File

@ -22,7 +22,6 @@ import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.HBaseIOException;
import org.apache.hadoop.hbase.HConstants;
@ -43,6 +42,7 @@ import org.apache.hadoop.hbase.util.ServerRegionReplicaUtil;
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.ModifyTableState;
@ -56,8 +56,6 @@ public class ModifyTableProcedure
private TableDescriptor modifiedTableDescriptor;
private boolean deleteColumnFamilyInModify;
private Boolean traceEnabled = null;
public ModifyTableProcedure() {
super();
initilize();
@ -79,17 +77,13 @@ public class ModifyTableProcedure
private void initilize() {
this.unmodifiedTableDescriptor = null;
this.traceEnabled = null;
this.deleteColumnFamilyInModify = false;
}
@Override
protected Flow executeFromState(final MasterProcedureEnv env, final ModifyTableState state)
throws InterruptedException {
if (isTraceEnabled()) {
LOG.trace(this + " execute state=" + state);
}
LOG.trace("{} execute state={}", this, state);
try {
switch (state) {
case MODIFY_TABLE_PREPARE:
@ -122,8 +116,7 @@ public class ModifyTableProcedure
break;
case MODIFY_TABLE_REOPEN_ALL_REGIONS:
if (env.getAssignmentManager().isTableEnabled(getTableName())) {
addChildProcedure(env.getAssignmentManager()
.createReopenProcedures(getOpenRegionInfoList(env)));
addChildProcedure(new ReopenTableRegionsProcedure(getTableName()));
}
return Flow.NO_MORE_STATE;
default:
@ -133,8 +126,8 @@ public class ModifyTableProcedure
if (isRollbackSupported(state)) {
setFailure("master-modify-table", e);
} else {
LOG.warn("Retriable error trying to modify table=" + getTableName() +
" (in state=" + state + ")", e);
LOG.warn("Retriable error trying to modify table={} (in state={})", getTableName(), state,
e);
}
}
return Flow.HAS_MORE_STATE;
@ -172,7 +165,7 @@ public class ModifyTableProcedure
@Override
protected ModifyTableState getState(final int stateId) {
return ModifyTableState.valueOf(stateId);
return ModifyTableState.forNumber(stateId);
}
@Override
@ -293,22 +286,6 @@ public class ModifyTableProcedure
env.getMasterServices().getTableDescriptors().add(modifiedTableDescriptor);
}
/**
* Undo the descriptor change (for rollback)
* @param env MasterProcedureEnv
* @throws IOException
**/
private void restoreTableDescriptor(final MasterProcedureEnv env) throws IOException {
env.getMasterServices().getTableDescriptors().add(unmodifiedTableDescriptor);
// delete any new column families from the modifiedTableDescriptor.
deleteFromFs(env, modifiedTableDescriptor, unmodifiedTableDescriptor);
// Make sure regions are opened after table descriptor is updated.
//reOpenAllRegionsIfTableIsOnline(env);
// TODO: NUKE ROLLBACK!!!!
}
/**
* Removes from hdfs the families that are not longer present in the new table descriptor.
* @param env MasterProcedureEnv
@ -393,18 +370,6 @@ public class ModifyTableProcedure
runCoprocessorAction(env, state);
}
/**
* The procedure could be restarted from a different machine. If the variable is null, we need to
* retrieve it.
* @return traceEnabled whether the trace is enabled
*/
private Boolean isTraceEnabled() {
if (traceEnabled == null) {
traceEnabled = LOG.isTraceEnabled();
}
return traceEnabled;
}
/**
* Coprocessor Action.
* @param env MasterProcedureEnv
@ -438,13 +403,4 @@ public class ModifyTableProcedure
private List<RegionInfo> getRegionInfoList(final MasterProcedureEnv env) throws IOException {
return env.getAssignmentManager().getRegionStates().getRegionsOfTable(getTableName());
}
/**
* Fetches all open or soon to be open Regions for a table. Cache the result of this method if
* you need to use it multiple times. Be aware that it may change over in between calls to this
* procedure.
*/
private List<RegionInfo> getOpenRegionInfoList(final MasterProcedureEnv env) throws IOException {
return env.getAssignmentManager().getRegionStates().getOpenRegionsOfTable(getTableName());
}
}

78
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ReopenTableRegionsProcedure.java
View File

@ -18,7 +18,14 @@
package org.apache.hadoop.hbase.master.procedure;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.hadoop.hbase.HBaseIOException;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.master.RegionPlan;
import org.apache.hadoop.hbase.master.assignment.MoveRegionProcedure;
import org.apache.hadoop.hbase.procedure2.ProcedureStateSerializer;
import org.apache.hadoop.hbase.procedure2.ProcedureSuspendedException;
import org.apache.hadoop.hbase.procedure2.ProcedureYieldException;
@ -31,8 +38,9 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.R
import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.ReopenTableRegionsStateData;
/**
* Used for non table procedures to reopen the regions for a table. For example,
* {@link org.apache.hadoop.hbase.master.replication.ModifyPeerProcedure}.
* Used for reopening the regions for a table.
* <p/>
* Currently we use {@link MoveRegionProcedure} to reopen regions.
*/
@InterfaceAudience.Private
public class ReopenTableRegionsProcedure
@ -42,6 +50,8 @@ public class ReopenTableRegionsProcedure
private TableName tableName;
private List<HRegionLocation> regions = Collections.emptyList();
public ReopenTableRegionsProcedure() {
}
@ -59,19 +69,53 @@ public class ReopenTableRegionsProcedure
return TableOperationType.REGION_EDIT;
}
private MoveRegionProcedure createReopenProcedure(MasterProcedureEnv env, HRegionLocation loc) {
try {
return new MoveRegionProcedure(env,
new RegionPlan(loc.getRegion(), loc.getServerName(), loc.getServerName()), false);
} catch (HBaseIOException e) {
// we skip the checks so this should not happen
throw new AssertionError(e);
}
}
@Override
protected Flow executeFromState(MasterProcedureEnv env, ReopenTableRegionsState state)
throws ProcedureSuspendedException, ProcedureYieldException, InterruptedException {
switch (state) {
case REOPEN_TABLE_REGIONS_REOPEN_ALL_REGIONS:
try {
addChildProcedure(env.getAssignmentManager().createReopenProcedures(
env.getAssignmentManager().getRegionStates().getRegionsOfTable(tableName)));
} catch (IOException e) {
LOG.warn("Failed to schedule reopen procedures for {}", tableName, e);
throw new ProcedureSuspendedException();
}
case REOPEN_TABLE_REGIONS_GET_REGIONS:
if (!env.getAssignmentManager().isTableEnabled(tableName)) {
LOG.info("Table {} is disabled, give up reopening its regions");
return Flow.NO_MORE_STATE;
}
regions =
env.getAssignmentManager().getRegionStates().getRegionsOfTableForReopen(tableName);
setNextState(ReopenTableRegionsState.REOPEN_TABLE_REGIONS_REOPEN_REGIONS);
return Flow.HAS_MORE_STATE;
case REOPEN_TABLE_REGIONS_REOPEN_REGIONS:
addChildProcedure(regions.stream().filter(l -> l.getSeqNum() >= 0)
.map(l -> createReopenProcedure(env, l)).toArray(MoveRegionProcedure[]::new));
setNextState(ReopenTableRegionsState.REOPEN_TABLE_REGIONS_CONFIRM_REOPENED);
return Flow.HAS_MORE_STATE;
case REOPEN_TABLE_REGIONS_CONFIRM_REOPENED:
regions = regions.stream().map(env.getAssignmentManager().getRegionStates()::checkReopened)
.filter(l -> l != null).collect(Collectors.toList());
if (regions.isEmpty()) {
return Flow.NO_MORE_STATE;
}
if (regions.stream().anyMatch(l -> l.getSeqNum() >= 0)) {
setNextState(ReopenTableRegionsState.REOPEN_TABLE_REGIONS_REOPEN_REGIONS);
return Flow.HAS_MORE_STATE;
}
LOG.info("There are still {} region(s) which need to be reopened for table {} are in " +
"OPENING state, try again later", regions.size(), tableName);
// All the regions need to reopen are in OPENING state which means we can not schedule any
// MRPs. Then sleep for one second, and yield the procedure to let other procedures run
// first and hope next time we can get some regions in other state to make progress.
// TODO: add a delay for ProcedureYieldException so that we do not need to sleep here which
// blocks a procedure worker.
Thread.sleep(1000);
throw new ProcedureYieldException();
default:
throw new UnsupportedOperationException("unhandled state=" + state);
}
@ -95,20 +139,24 @@ public class ReopenTableRegionsProcedure
@Override
protected ReopenTableRegionsState getInitialState() {
return ReopenTableRegionsState.REOPEN_TABLE_REGIONS_REOPEN_ALL_REGIONS;
return ReopenTableRegionsState.REOPEN_TABLE_REGIONS_GET_REGIONS;
}
@Override
protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException {
super.serializeStateData(serializer);
serializer.serialize(ReopenTableRegionsStateData.newBuilder()
.setTableName(ProtobufUtil.toProtoTableName(tableName)).build());
ReopenTableRegionsStateData.Builder builder = ReopenTableRegionsStateData.newBuilder()
.setTableName(ProtobufUtil.toProtoTableName(tableName));
regions.stream().map(ProtobufUtil::toRegionLocation).forEachOrdered(builder::addRegion);
serializer.serialize(builder.build());
}
@Override
protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {
super.deserializeStateData(serializer);
tableName = ProtobufUtil
.toTableName(serializer.deserialize(ReopenTableRegionsStateData.class).getTableName());
ReopenTableRegionsStateData data = serializer.deserialize(ReopenTableRegionsStateData.class);
tableName = ProtobufUtil.toTableName(data.getTableName());
regions = data.getRegionList().stream().map(ProtobufUtil::toRegionLocation)
.collect(Collectors.toList());
}
}