VladRodionov commented on code in PR #8279:
URL: https://github.com/apache/hbase/pull/8279#discussion_r3314654229
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hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/cache/CacheTopology.java:
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@@ -198,4 +198,50 @@ default boolean demote(BlockCacheKey cacheKey, Cacheable
block, CacheEngine sour
* @return read-only topology view
*/
CacheTopologyView getView();
+
+ /**
+ * Returns the resizable cache engine for the specified tier, if that tier
exists and its engine
+ * supports runtime resizing.
+ * <p>
+ * Resizing is an optional per-engine capability. A topology may contain a
mix of resizable and
+ * non-resizable engines, for example a resizable on-heap L1 and a
fixed-size off-heap L2. This
+ * helper allows admin/control code to discover resize support without
exposing resizing on the
+ * read/write path facade.
+ * </p>
+ * @param tier cache tier to inspect
+ * @return resizable engine for the tier, or empty if the tier does not
exist or is not resizable
+ */
+ default Optional<ResizableCacheEngine> getResizableEngine(CacheTier tier) {
Review Comment:
ResizableBlockCache interface conversion. Yes, it will be used later in
subsequent PRs.
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