nizhikov commented on a change in pull request #6738: IGNITE-12027 NPE on try 
to read the MinimumNumberOfPartitionCopies metric.
URL: https://github.com/apache/ignite/pull/6738#discussion_r324627634
 
 

 ##########
 File path: 
modules/core/src/main/java/org/apache/ignite/internal/processors/cache/CacheGroupMetricsImpl.java
 ##########
 @@ -126,13 +133,22 @@ public CacheGroupMetricsImpl(CacheGroupContext ctx) {
             this::getTotalAllocatedSize,
             "Total size of memory allocated for group, in bytes.");
 
-        mreg.register("StorageSize",
-            this::getStorageSize,
-            "Storage space allocated for group, in bytes.");
+        if (ctx.shared().database() instanceof GridCacheDatabaseSharedManager) 
{
+            mreg.register("StorageSize",
+                () -> database().forGroupPageStores(ctx, PageStore::size),
+                "Storage space allocated for group, in bytes.");
 
-        mreg.register("SparseStorageSize",
-            this::getSparseStorageSize,
-            "Storage space allocated for group adjusted for possible sparsity, 
in bytes.");
+            mreg.register("SparseStorageSize",
+                () -> database().forGroupPageStores(ctx, 
PageStore::getSparseSize),
+                "Storage space allocated for group adjusted for possible 
sparsity, in bytes.");
+
+            storageSize = mreg.findMetric("StorageSize");
+            sparseStorageSize = mreg.findMetric("SparseStorageSize");
+        }
+        else {
+            storageSize = new AtomicLongMetric("NO_OP", null);
 
 Review comment:
   I think it can be reworked as `storageSize == null ? 0 : 
storageSize.longValue()`.
   Let's do it?

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