HBASE-18492 [AMv2] Embed code for selecting highest versioned region server for system table regions in AssignmentManager.processAssignQueue()
* Modified AssignmentManager.processAssignQueue() method to consider only highest versioned region servers for system table regions when destination server is not specified for them. Destination server is retained, if specified. * Modified MoveRegionProcedure to allow null value for destination server i.e. moving a region from specific source server to non-specific/ unknown destination server (picked by load-balancer) is supported now. * Removed destination server selection from HMaster.checkIfShouldMoveSystemRegionAsync(), as destination server will be picked by load balancer Signed-off-by: Michael Stack <stack@apache.org>
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@ -387,7 +387,8 @@ enum MoveRegionState {
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message MoveRegionStateData {
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optional RegionInfo region_info = 1;
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required ServerName source_server = 2;
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required ServerName destination_server = 3;
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// if destination server not specified, its selected with load balancer
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optional ServerName destination_server = 3;
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}
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enum GCRegionState {
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@ -478,15 +478,13 @@ public class AssignmentManager implements ServerListener {
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new Thread(() -> {
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try {
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synchronized (checkIfShouldMoveSystemRegionLock) {
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List<ServerName> serverList = master.getServerManager()
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.createDestinationServersList(getExcludedServersForSystemTable());
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List<RegionPlan> plans = new ArrayList<>();
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for (ServerName server : getExcludedServersForSystemTable()) {
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List<HRegionInfo> regionsShouldMove = getCarryingSystemTables(server);
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if (!regionsShouldMove.isEmpty()) {
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for (HRegionInfo regionInfo : regionsShouldMove) {
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RegionPlan plan = new RegionPlan(regionInfo, server,
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getBalancer().randomAssignment(regionInfo, serverList));
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// null value for dest forces destination server to be selected by balancer
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RegionPlan plan = new RegionPlan(regionInfo, server, null);
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if (regionInfo.isMetaRegion()) {
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// Must move meta region first.
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moveAsync(plan);
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@ -1648,9 +1646,14 @@ public class AssignmentManager implements ServerListener {
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}
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// TODO: Optimize balancer. pass a RegionPlan?
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final HashMap<HRegionInfo, ServerName> retainMap = new HashMap<HRegionInfo, ServerName>();
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final List<HRegionInfo> rrList = new ArrayList<HRegionInfo>();
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final HashMap<HRegionInfo, ServerName> retainMap = new HashMap<>();
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final List<HRegionInfo> userRRList = new ArrayList<>();
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// regions for system tables requiring reassignment
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final List<HRegionInfo> sysRRList = new ArrayList<>();
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for (RegionStateNode regionNode : regions.values()) {
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boolean sysTable = regionNode.isSystemTable();
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final List<HRegionInfo> rrList = sysTable ? sysRRList : userRRList;
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if (regionNode.getRegionLocation() != null) {
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retainMap.put(regionNode.getRegionInfo(), regionNode.getRegionLocation());
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} else {
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@ -1659,7 +1662,6 @@ public class AssignmentManager implements ServerListener {
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}
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// TODO: connect with the listener to invalidate the cache
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final LoadBalancer balancer = getBalancer();
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// TODO use events
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List<ServerName> servers = master.getServerManager().createDestinationServersList();
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@ -1679,13 +1681,35 @@ public class AssignmentManager implements ServerListener {
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servers = master.getServerManager().createDestinationServersList();
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}
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final boolean isTraceEnabled = LOG.isTraceEnabled();
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if (!sysRRList.isEmpty()) {
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// system table regions requiring reassignment are present, get region servers
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// not available for system table regions
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final List<ServerName> excludeServers = getExcludedServersForSystemTable();
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List<ServerName> serversForSysTables = servers.stream()
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.filter(s -> !excludeServers.contains(s)).collect(Collectors.toList());
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if (serversForSysTables.isEmpty()) {
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LOG.warn("No servers available for system table regions, considering all servers!");
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}
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LOG.debug("Processing assignment plans for System tables sysServersCount=" +
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serversForSysTables.size() + ", allServersCount=" + servers.size());
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processAssignmentPlans(regions, null, sysRRList,
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serversForSysTables.isEmpty() ? servers : serversForSysTables);
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}
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processAssignmentPlans(regions, retainMap, userRRList, servers);
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}
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private void processAssignmentPlans(final HashMap<HRegionInfo, RegionStateNode> regions,
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final HashMap<HRegionInfo, ServerName> retainMap, final List<HRegionInfo> rrList,
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final List<ServerName> servers) {
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boolean isTraceEnabled = LOG.isTraceEnabled();
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if (isTraceEnabled) {
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LOG.trace("available servers count=" + servers.size() + ": " + servers);
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}
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final LoadBalancer balancer = getBalancer();
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// ask the balancer where to place regions
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if (!retainMap.isEmpty()) {
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if (retainMap != null && !retainMap.isEmpty()) {
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if (isTraceEnabled) {
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LOG.trace("retain assign regions=" + retainMap);
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}
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@ -54,7 +54,6 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
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public MoveRegionProcedure(final MasterProcedureEnv env, final RegionPlan plan) {
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super(env, plan.getRegionInfo());
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assert plan.getDestination() != null: plan.toString();
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this.plan = plan;
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}
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@ -70,7 +69,10 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
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setNextState(MoveRegionState.MOVE_REGION_ASSIGN);
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break;
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case MOVE_REGION_ASSIGN:
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addChildProcedure(new AssignProcedure(plan.getRegionInfo(), plan.getDestination()));
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AssignProcedure assignProcedure = plan.getDestination() == null ?
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new AssignProcedure(plan.getRegionInfo(), true) :
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new AssignProcedure(plan.getRegionInfo(), plan.getDestination());
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addChildProcedure(assignProcedure);
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return Flow.NO_MORE_STATE;
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default:
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throw new UnsupportedOperationException("unhandled state=" + state);
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@ -127,8 +129,10 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
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final MoveRegionStateData.Builder state = MoveRegionStateData.newBuilder()
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// No need to serialize the HRegionInfo. The super class has the region.
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.setSourceServer(ProtobufUtil.toServerName(plan.getSource()))
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.setDestinationServer(ProtobufUtil.toServerName(plan.getDestination()));
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.setSourceServer(ProtobufUtil.toServerName(plan.getSource()));
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if (plan.getDestination() != null) {
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state.setDestinationServer(ProtobufUtil.toServerName(plan.getDestination()));
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}
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state.build().writeDelimitedTo(stream);
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}
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@ -139,7 +143,8 @@ public class MoveRegionProcedure extends AbstractStateMachineRegionProcedure<Mov
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final MoveRegionStateData state = MoveRegionStateData.parseDelimitedFrom(stream);
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final HRegionInfo regionInfo = getRegion(); // Get it from super class deserialization.
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final ServerName sourceServer = ProtobufUtil.toServerName(state.getSourceServer());
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final ServerName destinationServer = ProtobufUtil.toServerName(state.getDestinationServer());
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final ServerName destinationServer = state.hasDestinationServer() ?
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ProtobufUtil.toServerName(state.getDestinationServer()) : null;
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this.plan = new RegionPlan(regionInfo, sourceServer, destinationServer);
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}
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}
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