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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 17:20:00 GMT

     [ https://issues.apache.org/jira/browse/HDDS-1499?focusedWorklogId=242690&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-242690
]

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

                Author: ASF GitHub Bot
            Created on: 15/May/19 17:19
            Start Date: 15/May/19 17:19
    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_r284364154
 
 

 ##########
 File path: hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OmMetadataManagerImpl.java
 ##########
 @@ -245,42 +247,50 @@ protected DBStoreBuilder addOMTablesAndCodecs(DBStoreBuilder builder)
{
    */
   protected void initializeOmTables() throws IOException {
     userTable =
-        this.store.getTable(USER_TABLE, String.class, VolumeList.class);
+        this.store.getTable(USER_TABLE, String.class, VolumeList.class,
 
 Review comment:
   As for some tables where SCM does not need to have cache, so that is the reason for introducing
CacheType.
   And also for some tables like deletedtable, where this is used by background thread inOM,
these does not need cache.
   
   And as for volume/bucket table we plan to have entire table info, and cleanup for them
is no-op, even after flush to db, where as for partial cache the cache entries will be cleaned
up. This is the only difference between full table cache vs partial table cache.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 242690)
    Time Spent: 6h 10m  (was: 6h)

> 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 10m
>  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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