Don't swallow exceptions on replication (#31179)

Swallowing these exceptions is dangerous as they can result in replicas going out-of-sync with the primary. Follow-up to #28571
elastic · Jun 11, 2018 · 4e9b554 · 4e9b554
1 parent f825a53
commit 4e9b554
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Showing 3 changed files with 24 additions and 43 deletions.
diff --git a/server/src/main/java/org/elasticsearch/action/bulk/TransportShardBulkAction.java b/server/src/main/java/org/elasticsearch/action/bulk/TransportShardBulkAction.java
@@ -486,32 +486,24 @@ public static Translog.Location performOnReplica(BulkShardRequest request, Index
             BulkItemRequest item = request.items()[i];
             final Engine.Result operationResult;
             DocWriteRequest docWriteRequest = item.request();
-            try {
-                switch (replicaItemExecutionMode(item, i)) {
-                    case NORMAL:
-                        final DocWriteResponse primaryResponse = item.getPrimaryResponse().getResponse();
-                        operationResult = performOpOnReplica(primaryResponse, docWriteRequest, replica);
-                        assert operationResult != null : "operation result must never be null when primary response has no failure";
-                        location = syncOperationResultOrThrow(operationResult, location);
-                        break;
-                    case NOOP:
-                        break;
-                    case FAILURE:
-                        final BulkItemResponse.Failure failure = item.getPrimaryResponse().getFailure();
-                        assert failure.getSeqNo() != SequenceNumbers.UNASSIGNED_SEQ_NO : "seq no must be assigned";
-                        operationResult = replica.markSeqNoAsNoop(failure.getSeqNo(), failure.getMessage());
-                        assert operationResult != null : "operation result must never be null when primary response has no failure";
-                        location = syncOperationResultOrThrow(operationResult, location);
-                        break;
-                    default:
-                        throw new IllegalStateException("illegal replica item execution mode for: " + docWriteRequest);
-               }
-            } catch (Exception e) {
-                // if its not an ignore replica failure, we need to make sure to bubble up the failure
-                // so we will fail the shard
-                if (!TransportActions.isShardNotAvailableException(e)) {
-                    throw e;
-                }
+            switch (replicaItemExecutionMode(item, i)) {
+                case NORMAL:
+                    final DocWriteResponse primaryResponse = item.getPrimaryResponse().getResponse();
+                    operationResult = performOpOnReplica(primaryResponse, docWriteRequest, replica);
+                    assert operationResult != null : "operation result must never be null when primary response has no failure";
+                    location = syncOperationResultOrThrow(operationResult, location);
+                    break;
+                case NOOP:
+                    break;
+                case FAILURE:
+                    final BulkItemResponse.Failure failure = item.getPrimaryResponse().getFailure();
+                    assert failure.getSeqNo() != SequenceNumbers.UNASSIGNED_SEQ_NO : "seq no must be assigned";
+                    operationResult = replica.markSeqNoAsNoop(failure.getSeqNo(), failure.getMessage());
+                    assert operationResult != null : "operation result must never be null when primary response has no failure";
+                    location = syncOperationResultOrThrow(operationResult, location);
+                    break;
+                default:
+                    throw new IllegalStateException("illegal replica item execution mode for: " + docWriteRequest);
             }
         }
         return location;

diff --git a/server/src/main/java/org/elasticsearch/action/resync/TransportResyncReplicationAction.java b/server/src/main/java/org/elasticsearch/action/resync/TransportResyncReplicationAction.java
@@ -121,19 +121,12 @@ protected WriteReplicaResult shardOperationOnReplica(ResyncReplicationRequest re
     public static Translog.Location performOnReplica(ResyncReplicationRequest request, IndexShard replica) throws Exception {
         Translog.Location location = null;
         for (Translog.Operation operation : request.getOperations()) {
-            try {
-                final Engine.Result operationResult = replica.applyTranslogOperation(operation, Engine.Operation.Origin.REPLICA);
-                if (operationResult.getResultType() == Engine.Result.Type.MAPPING_UPDATE_REQUIRED) {
-                    throw new TransportReplicationAction.RetryOnReplicaException(replica.shardId(),
-                        "Mappings are not available on the replica yet, triggered update: " + operationResult.getRequiredMappingUpdate());
-                }
-                location = syncOperationResultOrThrow(operationResult, location);
-            } catch (Exception e) {
-                // if its not a failure to be ignored, let it bubble up
-                if (!TransportActions.isShardNotAvailableException(e)) {
-                    throw e;
-                }
+            final Engine.Result operationResult = replica.applyTranslogOperation(operation, Engine.Operation.Origin.REPLICA);
+            if (operationResult.getResultType() == Engine.Result.Type.MAPPING_UPDATE_REQUIRED) {
+                throw new TransportReplicationAction.RetryOnReplicaException(replica.shardId(),
+                    "Mappings are not available on the replica yet, triggered update: " + operationResult.getRequiredMappingUpdate());
             }
+            location = syncOperationResultOrThrow(operationResult, location);
         }
         if (request.getTrimAboveSeqNo() != SequenceNumbers.UNASSIGNED_SEQ_NO) {
             replica.trimOperationOfPreviousPrimaryTerms(request.getTrimAboveSeqNo());

diff --git a/server/src/main/java/org/elasticsearch/action/support/replication/TransportWriteAction.java b/server/src/main/java/org/elasticsearch/action/support/replication/TransportWriteAction.java
@@ -76,11 +76,7 @@ protected static Location syncOperationResultOrThrow(final Engine.Result operati
             // check if any transient write operation failures should be bubbled up
             Exception failure = operationResult.getFailure();
             assert failure instanceof MapperParsingException : "expected mapper parsing failures. got " + failure;
-            if (!TransportActions.isShardNotAvailableException(failure)) {
-                throw failure;
-            } else {
-                location = currentLocation;
-            }
+            throw failure;
         } else {
             location = locationToSync(currentLocation, operationResult.getTranslogLocation());
         }