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_r324635677
 
 

 ##########
 File path: 
modules/core/src/main/java/org/apache/ignite/internal/processors/cache/CacheGroupMetricsImpl.java
 ##########
 @@ -59,6 +60,12 @@
     /** */
     private final LongAdderMetric groupPageAllocationTracker;
 
+    /** */
+    private volatile LongMetric storageSize;
+
+    /** */
+    private volatile LongMetric sparseStorageSize;
 
 Review comment:
   Why this variable is volatile?
   
   

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