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[Remote Routing Table] Implement write and read flow for shard diff f…
…ile. (#14684) * Implement write and read flow to upload/download shard diff file. Signed-off-by: Shailendra Singh <[email protected]>
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168 changes: 168 additions & 0 deletions
168
server/src/main/java/org/opensearch/cluster/routing/RoutingTableIncrementalDiff.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,168 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| package org.opensearch.cluster.routing; | ||
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| import org.opensearch.cluster.Diff; | ||
| import org.opensearch.core.common.io.stream.StreamInput; | ||
| import org.opensearch.core.common.io.stream.StreamOutput; | ||
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|
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| /** | ||
| * Represents a difference between {@link RoutingTable} objects that can be serialized and deserialized. | ||
| */ | ||
| public class RoutingTableIncrementalDiff implements Diff<RoutingTable> { | ||
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| private final Map<String, Diff<IndexRoutingTable>> diffs; | ||
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| /** | ||
| * Constructs a new RoutingTableIncrementalDiff with the given differences. | ||
| * | ||
| * @param diffs a map containing the differences of {@link IndexRoutingTable}. | ||
| */ | ||
| public RoutingTableIncrementalDiff(Map<String, Diff<IndexRoutingTable>> diffs) { | ||
| this.diffs = diffs; | ||
| } | ||
|
|
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| /** | ||
| * Gets the map of differences of {@link IndexRoutingTable}. | ||
| * | ||
| * @return a map containing the differences. | ||
| */ | ||
| public Map<String, Diff<IndexRoutingTable>> getDiffs() { | ||
| return diffs; | ||
| } | ||
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|
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| /** | ||
| * Reads a {@link RoutingTableIncrementalDiff} from the given {@link StreamInput}. | ||
| * | ||
| * @param in the input stream to read from. | ||
| * @return the deserialized RoutingTableIncrementalDiff. | ||
| * @throws IOException if an I/O exception occurs while reading from the stream. | ||
| */ | ||
| public static RoutingTableIncrementalDiff readFrom(StreamInput in) throws IOException { | ||
| int size = in.readVInt(); | ||
| Map<String, Diff<IndexRoutingTable>> diffs = new HashMap<>(); | ||
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| for (int i = 0; i < size; i++) { | ||
| String key = in.readString(); | ||
| Diff<IndexRoutingTable> diff = IndexRoutingTableIncrementalDiff.readFrom(in); | ||
| diffs.put(key, diff); | ||
| } | ||
| return new RoutingTableIncrementalDiff(diffs); | ||
| } | ||
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|
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| /** | ||
| * Applies the differences to the provided {@link RoutingTable}. | ||
| * | ||
| * @param part the original RoutingTable to which the differences will be applied. | ||
| * @return the updated RoutingTable with the applied differences. | ||
| */ | ||
| @Override | ||
| public RoutingTable apply(RoutingTable part) { | ||
| RoutingTable.Builder builder = new RoutingTable.Builder(); | ||
| for (IndexRoutingTable indexRoutingTable : part) { | ||
| builder.add(indexRoutingTable); // Add existing index routing tables to builder | ||
| } | ||
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| // Apply the diffs | ||
| for (Map.Entry<String, Diff<IndexRoutingTable>> entry : diffs.entrySet()) { | ||
| builder.add(entry.getValue().apply(part.index(entry.getKey()))); | ||
| } | ||
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| return builder.build(); | ||
| } | ||
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| /** | ||
| * Writes the differences to the given {@link StreamOutput}. | ||
| * | ||
| * @param out the output stream to write to. | ||
| * @throws IOException if an I/O exception occurs while writing to the stream. | ||
| */ | ||
| @Override | ||
| public void writeTo(StreamOutput out) throws IOException { | ||
| out.writeVInt(diffs.size()); | ||
| for (Map.Entry<String, Diff<IndexRoutingTable>> entry : diffs.entrySet()) { | ||
| out.writeString(entry.getKey()); | ||
| entry.getValue().writeTo(out); | ||
| } | ||
| } | ||
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| /** | ||
| * Represents a difference between {@link IndexShardRoutingTable} objects that can be serialized and deserialized. | ||
| */ | ||
| public static class IndexRoutingTableIncrementalDiff implements Diff<IndexRoutingTable> { | ||
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| private final List<IndexShardRoutingTable> indexShardRoutingTables; | ||
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| /** | ||
| * Constructs a new IndexShardRoutingTableDiff with the given shard routing tables. | ||
| * | ||
| * @param indexShardRoutingTables a list of IndexShardRoutingTable representing the differences. | ||
| */ | ||
| public IndexRoutingTableIncrementalDiff(List<IndexShardRoutingTable> indexShardRoutingTables) { | ||
| this.indexShardRoutingTables = indexShardRoutingTables; | ||
| } | ||
|
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| /** | ||
| * Applies the differences to the provided {@link IndexRoutingTable}. | ||
| * | ||
| * @param part the original IndexRoutingTable to which the differences will be applied. | ||
| * @return the updated IndexRoutingTable with the applied differences. | ||
| */ | ||
| @Override | ||
| public IndexRoutingTable apply(IndexRoutingTable part) { | ||
| IndexRoutingTable.Builder builder = new IndexRoutingTable.Builder(part.getIndex()); | ||
| for (IndexShardRoutingTable shardRoutingTable : part) { | ||
| builder.addIndexShard(shardRoutingTable); // Add existing shards to builder | ||
| } | ||
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| // Apply the diff: update or add the new shard routing tables | ||
| for (IndexShardRoutingTable diffShard : indexShardRoutingTables) { | ||
| builder.addIndexShard(diffShard); | ||
| } | ||
| return builder.build(); | ||
| } | ||
|
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| /** | ||
| * Writes the differences to the given {@link StreamOutput}. | ||
| * | ||
| * @param out the output stream to write to. | ||
| * @throws IOException if an I/O exception occurs while writing to the stream. | ||
| */ | ||
| @Override | ||
| public void writeTo(StreamOutput out) throws IOException { | ||
| out.writeVInt(indexShardRoutingTables.size()); | ||
| for (IndexShardRoutingTable shardRoutingTable : indexShardRoutingTables) { | ||
| IndexShardRoutingTable.Builder.writeTo(shardRoutingTable, out); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Reads a {@link IndexRoutingTableIncrementalDiff} from the given {@link StreamInput}. | ||
| * | ||
| * @param in the input stream to read from. | ||
| * @return the deserialized IndexShardRoutingTableDiff. | ||
| * @throws IOException if an I/O exception occurs while reading from the stream. | ||
| */ | ||
| public static IndexRoutingTableIncrementalDiff readFrom(StreamInput in) throws IOException { | ||
| int size = in.readVInt(); | ||
| List<IndexShardRoutingTable> indexShardRoutingTables = new ArrayList<>(size); | ||
| for (int i = 0; i < size; i++) { | ||
| IndexShardRoutingTable shardRoutingTable = IndexShardRoutingTable.Builder.readFrom(in); | ||
| indexShardRoutingTables.add(shardRoutingTable); | ||
| } | ||
| return new IndexRoutingTableIncrementalDiff(indexShardRoutingTables); | ||
| } | ||
| } | ||
| } |
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