Fix test

Author: nodece

pulsar-broker/src/main/java/org/apache/pulsar/broker/delayed/bucket/ImmutableBucket.java

@@ -140,7 +140,9 @@ private CompletableFuture<List<DelayedIndex>> asyncLoadNextBucketSnapshotEntry(b
                         List<DelayedIndex> indexList = snapshotSegment.getIndexesList();
                         this.setCurrentSegmentEntryId(nextSegmentEntryId);
                         if (isRecover) {
-                            return this.asyncUpdateSnapshotLength().thenApply(__ -> indexList);
+                            return this.asyncUpdateSnapshotLength()
+                                    .thenAccept(this::setSnapshotLength)
+                                    .thenApply(__ -> indexList);
                         }
                         return CompletableFuture.completedFuture(indexList);
                     });
@@ -247,8 +249,6 @@ protected CompletableFuture<Long> asyncUpdateSnapshotLength() {
                         .attr("bucketKey", bucketKey())
                         .exception(ex)
                         .log("Failed to get snapshot length");
-            } else {
-                setSnapshotLength(length);
             }
         });
     }