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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.cluster.routing;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.RestoreInProgress;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.repositories.IndexId;
import org.elasticsearch.snapshots.Snapshot;
import org.elasticsearch.xcontent.ToXContent;
import org.elasticsearch.xcontent.ToXContentObject;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Objects;
/**
* Represents the recovery source of a shard. Available recovery types are:
*
* - {@link EmptyStoreRecoverySource} recovery from an empty store
* - {@link ExistingStoreRecoverySource} recovery from an existing store
* - {@link PeerRecoverySource} recovery from a primary on another node
* - {@link SnapshotRecoverySource} recovery from a snapshot
* - {@link LocalShardsRecoverySource} recovery from other shards of another index on the same node
*/
public abstract class RecoverySource implements Writeable, ToXContentObject {
@Override
public final XContentBuilder toXContent(XContentBuilder builder, ToXContent.Params params) throws IOException {
builder.startObject();
builder.field("type", getType());
addAdditionalFields(builder, params);
return builder.endObject();
}
/**
* to be overridden by subclasses
*/
public void addAdditionalFields(XContentBuilder builder, ToXContent.Params params) throws IOException {
}
public static RecoverySource readFrom(StreamInput in) throws IOException {
Type type = Type.values()[in.readByte()];
switch (type) {
case EMPTY_STORE:
return EmptyStoreRecoverySource.INSTANCE;
case EXISTING_STORE:
return ExistingStoreRecoverySource.read(in);
case PEER:
return PeerRecoverySource.INSTANCE;
case SNAPSHOT:
return new SnapshotRecoverySource(in);
case LOCAL_SHARDS:
return LocalShardsRecoverySource.INSTANCE;
default:
throw new IllegalArgumentException("unknown recovery type: " + type.name());
}
}
@Override
public final void writeTo(StreamOutput out) throws IOException {
out.writeByte((byte) getType().ordinal());
writeAdditionalFields(out);
}
/**
* to be overridden by subclasses
*/
protected void writeAdditionalFields(StreamOutput out) throws IOException {
}
public enum Type {
EMPTY_STORE,
EXISTING_STORE,
PEER,
SNAPSHOT,
LOCAL_SHARDS
}
public abstract Type getType();
public boolean shouldBootstrapNewHistoryUUID() {
return false;
}
public boolean expectEmptyRetentionLeases() {
return true;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
RecoverySource that = (RecoverySource) o;
return getType() == that.getType();
}
@Override
public int hashCode() {
return getType().hashCode();
}
/**
* Recovery from a fresh copy
*/
public static final class EmptyStoreRecoverySource extends RecoverySource {
public static final EmptyStoreRecoverySource INSTANCE = new EmptyStoreRecoverySource();
@Override
public Type getType() {
return Type.EMPTY_STORE;
}
@Override
public String toString() {
return "new shard recovery";
}
}
/**
* Recovery from an existing on-disk store
*/
public static final class ExistingStoreRecoverySource extends RecoverySource {
/**
* Special allocation id that shard has during initialization on allocate_stale_primary
*/
public static final String FORCED_ALLOCATION_ID = "_forced_allocation_";
public static final ExistingStoreRecoverySource INSTANCE = new ExistingStoreRecoverySource(false);
public static final ExistingStoreRecoverySource FORCE_STALE_PRIMARY_INSTANCE = new ExistingStoreRecoverySource(true);
private final boolean bootstrapNewHistoryUUID;
private ExistingStoreRecoverySource(boolean bootstrapNewHistoryUUID) {
this.bootstrapNewHistoryUUID = bootstrapNewHistoryUUID;
}
private static ExistingStoreRecoverySource read(StreamInput in) throws IOException {
return in.readBoolean() ? FORCE_STALE_PRIMARY_INSTANCE : INSTANCE;
}
@Override
public void addAdditionalFields(XContentBuilder builder, Params params) throws IOException {
builder.field("bootstrap_new_history_uuid", bootstrapNewHistoryUUID);
}
@Override
protected void writeAdditionalFields(StreamOutput out) throws IOException {
out.writeBoolean(bootstrapNewHistoryUUID);
}
@Override
public boolean shouldBootstrapNewHistoryUUID() {
return bootstrapNewHistoryUUID;
}
@Override
public Type getType() {
return Type.EXISTING_STORE;
}
@Override
public String toString() {
return "existing store recovery; bootstrap_history_uuid=" + bootstrapNewHistoryUUID;
}
@Override
public boolean expectEmptyRetentionLeases() {
return bootstrapNewHistoryUUID;
}
}
/**
* recovery from other shards on same node (shrink index action)
*/
public static class LocalShardsRecoverySource extends RecoverySource {
public static final LocalShardsRecoverySource INSTANCE = new LocalShardsRecoverySource();
private LocalShardsRecoverySource() {}
@Override
public Type getType() {
return Type.LOCAL_SHARDS;
}
@Override
public String toString() {
return "local shards recovery";
}
}
/**
* recovery from a snapshot
*/
public static class SnapshotRecoverySource extends RecoverySource {
public static final String NO_API_RESTORE_UUID = "_no_api_";
private final String restoreUUID;
private final Snapshot snapshot;
private final IndexId index;
private final Version version;
public SnapshotRecoverySource(String restoreUUID, Snapshot snapshot, Version version, IndexId indexId) {
this.restoreUUID = restoreUUID;
this.snapshot = Objects.requireNonNull(snapshot);
this.version = Objects.requireNonNull(version);
this.index = Objects.requireNonNull(indexId);
}
SnapshotRecoverySource(StreamInput in) throws IOException {
if (in.getVersion().onOrAfter(Version.V_6_6_0)) {
restoreUUID = in.readString();
} else {
restoreUUID = RestoreInProgress.BWC_UUID;
}
snapshot = new Snapshot(in);
version = Version.readVersion(in);
if (in.getVersion().onOrAfter(Version.V_7_7_0)) {
index = new IndexId(in);
} else {
index = new IndexId(in.readString(), IndexMetadata.INDEX_UUID_NA_VALUE);
}
}
public String restoreUUID() {
return restoreUUID;
}
public Snapshot snapshot() {
return snapshot;
}
/**
* Gets the {@link IndexId} of the recovery source. May contain {@link IndexMetadata#INDEX_UUID_NA_VALUE} as the index uuid if it
* was created by an older version master in a mixed version cluster.
*
* @return IndexId
*/
public IndexId index() {
return index;
}
public Version version() {
return version;
}
@Override
protected void writeAdditionalFields(StreamOutput out) throws IOException {
if (out.getVersion().onOrAfter(Version.V_6_6_0)) {
out.writeString(restoreUUID);
}
snapshot.writeTo(out);
Version.writeVersion(version, out);
if (out.getVersion().onOrAfter(Version.V_7_7_0)) {
index.writeTo(out);
} else {
out.writeString(index.getName());
}
}
@Override
public Type getType() {
return Type.SNAPSHOT;
}
@Override
public void addAdditionalFields(XContentBuilder builder, ToXContent.Params params) throws IOException {
builder.field("repository", snapshot.getRepository())
.field("snapshot", snapshot.getSnapshotId().getName())
.field("version", version.toString())
.field("index", index.getName())
.field("restoreUUID", restoreUUID);
}
@Override
public String toString() {
return "snapshot recovery [" + restoreUUID + "] from " + snapshot;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
SnapshotRecoverySource that = (SnapshotRecoverySource) o;
return restoreUUID.equals(that.restoreUUID)
&& snapshot.equals(that.snapshot)
&& index.equals(that.index)
&& version.equals(that.version);
}
@Override
public int hashCode() {
return Objects.hash(restoreUUID, snapshot, index, version);
}
}
/**
* peer recovery from a primary shard
*/
public static class PeerRecoverySource extends RecoverySource {
public static final PeerRecoverySource INSTANCE = new PeerRecoverySource();
private PeerRecoverySource() {}
@Override
public Type getType() {
return Type.PEER;
}
@Override
public String toString() {
return "peer recovery";
}
@Override
public boolean expectEmptyRetentionLeases() {
return false;
}
}
}