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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (HDDS-1499) OzoneManager Cache
Date Wed, 15 May 2019 17:23:00 GMT

     [ https://issues.apache.org/jira/browse/HDDS-1499?focusedWorklogId=242692&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-242692
]

ASF GitHub Bot logged work on HDDS-1499:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 15/May/19 17:22
            Start Date: 15/May/19 17:22
    Worklog Time Spent: 10m 
      Work Description: bharatviswa504 commented on pull request #798: HDDS-1499. OzoneManager
Cache.
URL: https://github.com/apache/hadoop/pull/798#discussion_r284365121
 
 

 ##########
 File path: hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/db/cache/TableCache.java
 ##########
 @@ -0,0 +1,73 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.hadoop.utils.db.cache;
+
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * Cache used for RocksDB tables.
+ * @param <CACHEKEY>
+ * @param <CACHEVALUE>
+ */
+
+@Private
+@Evolving
+public interface TableCache<CACHEKEY extends CacheKey,
+    CACHEVALUE extends CacheValue> {
+
+  /**
+   * Return the value for the key if it is present, otherwise return null.
+   * @param cacheKey
+   * @return CACHEVALUE
+   */
+  CACHEVALUE get(CACHEKEY cacheKey);
+
+  /**
+   * Add an entry to the cache, if the key already exists it overrides.
+   * @param cacheKey
+   * @param value
+   */
+  void put(CACHEKEY cacheKey, CACHEVALUE value);
+
+  /**
+   * Removes all the entries from the cache which are having epoch value less
+   * than or equal to specified epoch value.
+   * @param epoch
+   */
+  void cleanup(long epoch);
+
+  /**
+   * Return the size of the cache.
+   * @return size
+   */
+  int size();
+
+  /**
+   * Defines type of cache need to be used by OM RocksDB tables.
+   */
+  enum CACHETYPE {
 
 Review comment:
   The logic for get() actually takes care of that, I feel for bucket/volume table having
full cache will be useful as this is used for all the request validation's. So, if we have
in cache this will be a quick operation instead of disk access. 
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 242692)
    Time Spent: 6h 20m  (was: 6h 10m)

> OzoneManager Cache
> ------------------
>
>                 Key: HDDS-1499
>                 URL: https://issues.apache.org/jira/browse/HDDS-1499
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>          Components: Ozone Manager
>            Reporter: Bharat Viswanadham
>            Assignee: Bharat Viswanadham
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 6h 20m
>  Remaining Estimate: 0h
>
> In this Jira, we shall implement a cache for Table.
> As with OM HA, we are planning to implement double buffer implementation to flush transaction
in a batch, instead of using rocksdb put() for every operation. When this comes in to place
we need cache in OzoneManager HA to handle/server the requests for validation/returning responses.
>  
> This Jira will implement Cache as an integral part of the table. In this way users using
this table does not need to handle like check cache/db. For this, we can update get API in
the table to handle the cache.
>  
> This Jira will implement:
>  # Cache as a part of each Table.
>  # Uses this cache in get().
>  # Exposes api for cleanup, add entries to cache.
> Usage to add the entries in to cache will be done in further jira's.



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