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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.gateway;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.TransportVersions;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionListenerResponseHandler;
import org.elasticsearch.action.support.ChannelActionListener;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.block.ClusterBlocks;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.cluster.metadata.IndexMetadataVerifier;
import org.elasticsearch.cluster.metadata.Metadata;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.routing.allocation.allocator.AllocationActionListener;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.core.SuppressForbidden;
import org.elasticsearch.discovery.MasterNotDiscoveredException;
import org.elasticsearch.index.IndexVersion;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequest;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportResponse;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import static org.elasticsearch.cluster.metadata.MetadataIndexStateService.isIndexVerifiedBeforeClosed;
import static org.elasticsearch.core.Strings.format;
public class LocalAllocateDangledIndices {
private static final Logger logger = LogManager.getLogger(LocalAllocateDangledIndices.class);
public static final String ACTION_NAME = "internal:gateway/local/allocate_dangled";
private final TransportService transportService;
private final ClusterService clusterService;
private final AllocationService allocationService;
private final IndexMetadataVerifier indexMetadataVerifier;
@Inject
public LocalAllocateDangledIndices(
TransportService transportService,
ClusterService clusterService,
AllocationService allocationService,
IndexMetadataVerifier indexMetadataVerifier
) {
this.transportService = transportService;
this.clusterService = clusterService;
this.allocationService = allocationService;
this.indexMetadataVerifier = indexMetadataVerifier;
transportService.registerRequestHandler(
ACTION_NAME,
EsExecutors.DIRECT_EXECUTOR_SERVICE,
AllocateDangledRequest::new,
new AllocateDangledRequestHandler()
);
}
public void allocateDangled(Collection indices, ActionListener listener) {
ClusterState clusterState = clusterService.state();
DiscoveryNode masterNode = clusterState.nodes().getMasterNode();
if (masterNode == null) {
listener.onFailure(new MasterNotDiscoveredException());
return;
}
AllocateDangledRequest request = new AllocateDangledRequest(
clusterService.localNode(),
indices.toArray(new IndexMetadata[indices.size()])
);
transportService.sendRequest(
masterNode,
ACTION_NAME,
request,
new ActionListenerResponseHandler<>(listener, AllocateDangledResponse::new, EsExecutors.DIRECT_EXECUTOR_SERVICE)
);
}
class AllocateDangledRequestHandler implements TransportRequestHandler {
@Override
public void messageReceived(final AllocateDangledRequest request, final TransportChannel channel, Task task) throws Exception {
String[] indexNames = new String[request.indices.length];
for (int i = 0; i < request.indices.length; i++) {
indexNames[i] = request.indices[i].getIndex().getName();
}
final String source = "allocation dangled indices " + Arrays.toString(indexNames);
var listener = new AllocationActionListener(
new ChannelActionListener<>(channel),
transportService.getThreadPool().getThreadContext()
);
submitUnbatchedTask(source, new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) {
if (currentState.blocks().disableStatePersistence()) {
return currentState;
}
Metadata.Builder metadata = Metadata.builder(currentState.metadata());
ClusterBlocks.Builder blocks = ClusterBlocks.builder().blocks(currentState.blocks());
RoutingTable.Builder routingTableBuilder = RoutingTable.builder(
allocationService.getShardRoutingRoleStrategy(),
currentState.routingTable()
);
IndexVersion minIndexCompatibilityVersion = currentState.nodes().getMinSupportedIndexVersion();
IndexVersion maxIndexCompatibilityVersion = currentState.nodes().getMaxDataNodeCompatibleIndexVersion();
boolean importNeeded = false;
StringBuilder sb = new StringBuilder();
for (IndexMetadata indexMetadata : request.indices) {
if (indexMetadata.getCompatibilityVersion().before(minIndexCompatibilityVersion)) {
logger.warn(
"ignoring dangled index [{}] on node [{}] since it's current compatibility version [{}] "
+ "is not supported by at least one node in the cluster minVersion [{}]",
indexMetadata.getIndex(),
request.fromNode,
indexMetadata.getCompatibilityVersion(),
minIndexCompatibilityVersion
);
continue;
}
if (indexMetadata.getCompatibilityVersion().after(maxIndexCompatibilityVersion)) {
logger.warn(
"ignoring dangled index [{}] on node [{}] since its current compatibility version [{}] "
+ "is later than the maximum supported index version in the cluster [{}]",
indexMetadata.getIndex(),
request.fromNode,
indexMetadata.getCompatibilityVersion(),
maxIndexCompatibilityVersion
);
continue;
}
if (currentState.metadata().hasIndex(indexMetadata.getIndex().getName())) {
continue;
}
if (currentState.metadata().hasAlias(indexMetadata.getIndex().getName())) {
logger.warn(
"ignoring dangled index [{}] on node [{}] due to an existing alias with the same name",
indexMetadata.getIndex(),
request.fromNode
);
continue;
}
if (currentState.metadata().indexGraveyard().containsIndex(indexMetadata.getIndex())) {
logger.warn(
"ignoring dangled index [{}] on node [{}] since it was recently deleted",
indexMetadata.getIndex(),
request.fromNode
);
continue;
}
importNeeded = true;
IndexMetadata newIndexMetadata;
try {
// The dangled index might be from an older version, we need to make sure it's compatible
// with the current version.
newIndexMetadata = indexMetadataVerifier.verifyIndexMetadata(indexMetadata, minIndexCompatibilityVersion);
newIndexMetadata = IndexMetadata.builder(newIndexMetadata)
.settings(
Settings.builder()
.put(newIndexMetadata.getSettings())
.put(IndexMetadata.SETTING_HISTORY_UUID, UUIDs.randomBase64UUID())
)
.build();
} catch (Exception ex) {
// upgrade failed - adding index as closed
logger.warn(
() -> format(
"found dangled index [%s] on node [%s]. This index cannot be "
+ "upgraded to the latest version, adding as closed",
indexMetadata.getIndex(),
request.fromNode
),
ex
);
newIndexMetadata = IndexMetadata.builder(indexMetadata)
.state(IndexMetadata.State.CLOSE)
.version(indexMetadata.getVersion() + 1)
.build();
}
metadata.put(newIndexMetadata, false);
blocks.addBlocks(newIndexMetadata);
if (newIndexMetadata.getState() == IndexMetadata.State.OPEN || isIndexVerifiedBeforeClosed(indexMetadata)) {
routingTableBuilder.addAsFromDangling(newIndexMetadata);
}
sb.append("[").append(newIndexMetadata.getIndex()).append("/").append(newIndexMetadata.getState()).append("]");
}
if (importNeeded == false) {
listener.reroute().onResponse(null);
return currentState;
}
logger.info("importing dangled indices {} from [{}]", sb.toString(), request.fromNode);
RoutingTable routingTable = routingTableBuilder.build();
ClusterState updatedState = ClusterState.builder(currentState)
.metadata(metadata)
.blocks(blocks)
.routingTable(routingTable)
.build();
// now, reroute
return allocationService.reroute(
ClusterState.builder(updatedState).routingTable(routingTable).build(),
"dangling indices allocated",
listener.reroute()
);
}
@Override
public void onFailure(Exception e) {
listener.clusterStateUpdate().onFailure(e);
}
@Override
public void clusterStateProcessed(ClusterState oldState, ClusterState newState) {
listener.clusterStateUpdate().onResponse(new AllocateDangledResponse());
}
});
}
}
@SuppressForbidden(reason = "legacy usage of unbatched task") // TODO add support for batching here
private void submitUnbatchedTask(@SuppressWarnings("SameParameterValue") String source, ClusterStateUpdateTask task) {
clusterService.submitUnbatchedStateUpdateTask(source, task);
}
public static class AllocateDangledRequest extends TransportRequest {
DiscoveryNode fromNode;
IndexMetadata[] indices;
public AllocateDangledRequest(StreamInput in) throws IOException {
super(in);
fromNode = new DiscoveryNode(in);
indices = in.readArray(IndexMetadata::readFrom, IndexMetadata[]::new);
}
AllocateDangledRequest(DiscoveryNode fromNode, IndexMetadata[] indices) {
this.fromNode = fromNode;
this.indices = indices;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
fromNode.writeTo(out);
out.writeArray(indices);
}
}
public static class AllocateDangledResponse extends TransportResponse {
private AllocateDangledResponse(StreamInput in) throws IOException {
if (in.getTransportVersion().before(TransportVersions.V_8_0_0)) {
in.readBoolean();
}
}
private AllocateDangledResponse() {}
@Override
public void writeTo(StreamOutput out) throws IOException {
if (out.getTransportVersion().before(TransportVersions.V_8_0_0)) {
out.writeBoolean(true);
}
}
}
}