[Segment Replication] Remove codec name string match check for checkp…

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - OpenJDK Update (April 2023 Patch releases) ([#7448](https://github.com/opensearch-project/OpenSearch/pull/7448)
 
 ### Changed
+- [Segment Replication] Remove codec name string match check for checkpoints ([#7741](https://github.com/opensearch-project/OpenSearch/pull/7741))
 
 ### Deprecated
 

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -1623,12 +1623,6 @@ public final boolean shouldProcessCheckpoint(ReplicationCheckpoint requestCheckp
             );
             return false;
         }
-        if (localCheckpoint.getCodec().equals(requestCheckpoint.getCodec()) == false) {
-            logger.trace(
-                () -> new ParameterizedMessage("Shard does not support the received lucene codec version {}", requestCheckpoint.getCodec())
-            );
-            return false;
-        }
         return true;
     }
 

server/src/main/java/org/opensearch/indices/replication/OngoingSegmentReplications.java

@@ -14,7 +14,6 @@
 import org.opensearch.OpenSearchException;
 import org.opensearch.action.ActionListener;
 import org.opensearch.cluster.node.DiscoveryNode;
-import org.opensearch.common.util.CancellableThreads;
 import org.opensearch.common.util.concurrent.ConcurrentCollections;
 import org.opensearch.index.IndexService;
 import org.opensearch.index.shard.IndexShard;
@@ -148,12 +147,6 @@ void startSegmentCopy(GetSegmentFilesRequest request, ActionListener<GetSegmentF
      */
     CopyState prepareForReplication(CheckpointInfoRequest request, FileChunkWriter fileChunkWriter) throws IOException {
         final CopyState copyState = getCachedCopyState(request.getCheckpoint());
-        if (copyState.getCheckpoint().getCodec().equals(request.getCheckpoint().getCodec()) == false) {
-            logger.trace("Requested unsupported codec version {}", request.getCheckpoint().getCodec());
-            throw new CancellableThreads.ExecutionCancelledException(
-                new ParameterizedMessage("Requested unsupported codec version {}", request.getCheckpoint().getCodec()).toString()
-            );
-        }
         allocationIdToHandlers.compute(request.getTargetAllocationId(), (allocationId, segrepHandler) -> {
             if (segrepHandler != null) {
                 logger.warn("Override handler for allocation id {}", request.getTargetAllocationId());

server/src/test/java/org/opensearch/indices/replication/OngoingSegmentReplicationsTests.java

@@ -48,7 +48,7 @@
 public class OngoingSegmentReplicationsTests extends IndexShardTestCase {
 
     private final IndicesService mockIndicesService = mock(IndicesService.class);
-    private ReplicationCheckpoint testCheckpoint, olderCodecTestCheckpoint;
+    private ReplicationCheckpoint testCheckpoint;
     private DiscoveryNode primaryDiscoveryNode;
     private DiscoveryNode replicaDiscoveryNode;
     private IndexShard primary;
@@ -79,7 +79,6 @@ public void setUp() throws Exception {
 
         // This mirrors the creation of the ReplicationCheckpoint inside CopyState
         testCheckpoint = new ReplicationCheckpoint(testShardId, primary.getOperationPrimaryTerm(), 0L, 0L, defaultCodecName);
-        olderCodecTestCheckpoint = new ReplicationCheckpoint(testShardId, primary.getOperationPrimaryTerm(), 0L, 0L, "Lucene94");
         IndexService mockIndexService = mock(IndexService.class);
         when(mockIndicesService.indexServiceSafe(testShardId.getIndex())).thenReturn(mockIndexService);
         when(mockIndexService.getShard(testShardId.id())).thenReturn(primary);
@@ -94,44 +93,6 @@ public void tearDown() throws Exception {
         super.tearDown();
     }
 
-    public void testSuccessfulCodecCompatibilityCheck() throws Exception {
-        indexDoc(primary, "1", "{\"foo\" : \"baz\"}", XContentType.JSON, "foobar");
-        primary.refresh("Test");
-        OngoingSegmentReplications replications = spy(new OngoingSegmentReplications(mockIndicesService, recoverySettings));
-        // replica checkpoint is on same/higher lucene codec than primary
-        final CheckpointInfoRequest request = new CheckpointInfoRequest(
-            1L,
-            replica.routingEntry().allocationId().getId(),
-            replicaDiscoveryNode,
-            testCheckpoint
-        );
-        final FileChunkWriter segmentSegmentFileChunkWriter = (fileMetadata, position, content, lastChunk, totalTranslogOps, listener) -> {
-            listener.onResponse(null);
-        };
-        final CopyState copyState = replications.prepareForReplication(request, segmentSegmentFileChunkWriter);
-    }
-
-    public void testFailCodecCompatibilityCheck() throws Exception {
-        indexDoc(primary, "1", "{\"foo\" : \"baz\"}", XContentType.JSON, "foobar");
-        primary.refresh("Test");
-        OngoingSegmentReplications replications = spy(new OngoingSegmentReplications(mockIndicesService, recoverySettings));
-        // replica checkpoint is on lower/older lucene codec than primary
-        final CheckpointInfoRequest request = new CheckpointInfoRequest(
-            1L,
-            replica.routingEntry().allocationId().getId(),
-            replicaDiscoveryNode,
-            olderCodecTestCheckpoint
-        );
-        final FileChunkWriter segmentSegmentFileChunkWriter = (fileMetadata, position, content, lastChunk, totalTranslogOps, listener) -> {
-            listener.onResponse(null);
-        };
-        try {
-            final CopyState copyState = replications.prepareForReplication(request, segmentSegmentFileChunkWriter);
-        } catch (CancellableThreads.ExecutionCancelledException ex) {
-            Assert.assertTrue(ex.getMessage().contains("Requested unsupported codec version"));
-        }
-    }
-
     public void testPrepareAndSendSegments() throws IOException {
         indexDoc(primary, "1", "{\"foo\" : \"baz\"}", XContentType.JSON, "foobar");
         primary.refresh("Test");