odraese commented on a change in pull request #944: [Hive-22760] Adding Clock
based eviction strategy.
URL: https://github.com/apache/hive/pull/944#discussion_r395924117
##########
File path:
llap-server/src/java/org/apache/hadoop/hive/llap/cache/LlapCacheableBuffer.java
##########
@@ -26,39 +26,71 @@
* using a real programming language.
*/
public abstract class LlapCacheableBuffer {
- protected static final int IN_LIST = -2, NOT_IN_CACHE = -1;
-
- /** Priority for cache policy (should be pretty universal). */
- public double priority;
- /** Last priority update time for cache policy (should be pretty universal).
*/
- public long lastUpdate = -1;
+ public static final int INVALIDATE_OK = 0, INVALIDATE_FAILED = 1,
INVALIDATE_ALREADY_INVALID = 2;
- // TODO: remove some of these fields as needed?
+ public CacheAttribute cacheAttribute;
/** Linked list pointers for LRFU/LRU cache policies. Given that each block
is in cache
* that might be better than external linked list. Or not, since this is not
concurrent. */
public LlapCacheableBuffer prev = null;
/** Linked list pointers for LRFU/LRU cache policies. Given that each block
is in cache
* that might be better than external linked list. Or not, since this is not
concurrent. */
public LlapCacheableBuffer next = null;
- /** Index in heap for LRFU/LFU cache policies. */
- public int indexInHeap = NOT_IN_CACHE;
- public static final int INVALIDATE_OK = 0, INVALIDATE_FAILED = 1,
INVALIDATE_ALREADY_INVALID = 2;
+ /**
+ * @return result of invalidation.
+ */
protected abstract int invalidate();
+
+ /**
+ * @return size of the buffer in bytes.
+ */
public abstract long getMemoryUsage();
+
+ /**
+ * @param evictionDispatcher dispatcher object to be notified.
+ */
public abstract void notifyEvicted(EvictionDispatcher evictionDispatcher);
+ /**
Review comment:
As mentioned in the LlapAllocatorBuffer: we should keep the CachableBuffer
clear of eviction policy specific methods.
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