nicer logging

Author: original-brownbear

server/src/main/java/org/elasticsearch/cluster/routing/allocation/AllocationService.java

@@ -332,7 +332,8 @@ private void resetFailedAllocationCounter(RoutingAllocation allocation) {
      * @param <T>       The list element type.
      * @return A comma-separated string of the first few elements.
      */
-    static <T> String firstListElementsToCommaDelimitedString(List<T> elements, Function<T, String> formatter, boolean isDebugEnabled) {
+    public static <T> String firstListElementsToCommaDelimitedString(List<T> elements, Function<T, String> formatter,
+                                                                     boolean isDebugEnabled) {
         final int maxNumberOfElements = 10;
         if (isDebugEnabled || elements.size() <= maxNumberOfElements) {
             return elements.stream().map(formatter).collect(Collectors.joining(", "));

server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java

@@ -47,6 +47,7 @@
 import org.elasticsearch.cluster.metadata.RepositoriesMetaData;
 import org.elasticsearch.cluster.metadata.RepositoryMetaData;
 import org.elasticsearch.cluster.node.DiscoveryNode;
+import org.elasticsearch.cluster.routing.allocation.AllocationService;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.Numbers;
@@ -1270,7 +1271,8 @@ public void clusterStateProcessed(String source, ClusterState oldState, ClusterS
                             @Override
                             public void onResponse(Collection<Void> voids) {
                                 logger.info("Successfully loaded all snapshot's version information for {} from snapshot metadata",
-                                    snapshotIdsWithoutVersion);
+                                    AllocationService.firstListElementsToCommaDelimitedString(
+                                        snapshotIdsWithoutVersion, SnapshotId::toString, logger.isDebugEnabled()));
                             }
 
                             @Override