bharatviswa504 commented on a change in pull request #1100: HDDS-1802. Add
Eviction policy for table cache.
URL: https://github.com/apache/hadoop/pull/1100#discussion_r304680430
##########
File path:
hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/db/cache/TableCache.java
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@@ -69,4 +73,25 @@
* @return iterator of the underlying cache for the table.
*/
Iterator<Map.Entry<CACHEKEY, CACHEVALUE>> iterator();
+
+ /**
+ * Check key exist in cache or not.
+ *
+ * If it exists return CacheResult with value and status as
+ * {@link CacheStatus#EXISTS}
+ *
+ * If it does not exist:
+ * If cache clean up policy is
+ * {@link TableCacheImpl.CacheCleanupPolicy#NEVER} it means table cache is
+ * full cache. It return's {@link CacheResult} with null
+ * and status as {@link CacheStatus#NOT_EXIST}.
+ *
+ * If cache clean up policy is {@link CacheCleanupPolicy#MANUAL} it means
+ * table cache is partial cache. It return's {@link CacheResult} with
+ * null and status as CHECK_IN_TABLE.
+ *
+ * @param cachekey
+ */
+ CacheResult<CACHEVALUE> isExist(CACHEKEY cachekey);
Review comment:
Done.
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