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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] anuengineer commented on a change in pull request #798: HDDS-1499. OzoneManager Cache.
Date Wed, 08 May 2019 17:30:37 GMT
anuengineer commented on a change in pull request #798: HDDS-1499. OzoneManager Cache.
URL: https://github.com/apache/hadoop/pull/798#discussion_r282165925
 
 

 ##########
 File path: hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/db/TypedTable.java
 ##########
 @@ -31,22 +38,40 @@
  */
 public class TypedTable<KEY, VALUE> implements Table<KEY, VALUE> {
 
-  private Table<byte[], byte[]> rawTable;
+  private final Table<byte[], byte[]> rawTable;
+
+  private final CodecRegistry codecRegistry;
 
-  private CodecRegistry codecRegistry;
+  private final Class<KEY> keyType;
 
-  private Class<KEY> keyType;
+  private final Class<VALUE> valueType;
 
-  private Class<VALUE> valueType;
+  private final TableCache<CacheKey<KEY>, CacheValue<VALUE>> cache;
 
   public TypedTable(
       Table<byte[], byte[]> rawTable,
       CodecRegistry codecRegistry, Class<KEY> keyType,
       Class<VALUE> valueType) {
+    this(rawTable, codecRegistry, keyType, valueType,
+        null);
+  }
+
+
+  public TypedTable(
+      Table<byte[], byte[]> rawTable,
+      CodecRegistry codecRegistry, Class<KEY> keyType,
+      Class<VALUE> valueType, TableCache.CACHETYPE cachetype) {
     this.rawTable = rawTable;
     this.codecRegistry = codecRegistry;
     this.keyType = keyType;
     this.valueType = valueType;
+    if (cachetype == TableCache.CACHETYPE.FULLCACHE) {
 
 Review comment:
   It is impossible for the user to tell you apriori if they want a full cache or partial
cache. When you start a cluster you always want a full cache. We should get a cache size --
or get a percentage of memory from the OM cache size and use that if needed. Or for time being
rely on the RocksDB doing the right thing.

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