[jira] [Commented] (PHOENIX-2221) Option to make data regions not writable when index regions are not available

["Alicia Ying Shu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-2221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081597#comment-15081597 ] 

Alicia Ying Shu commented on PHOENIX-2221:
------------------------------------------

[~jamestaylor] Thanks for the info. In MetaDataEndpointImpl.java, will invalidate the cache update the client cache? In my test, writes are not blocked because the INDEX_DISABLE_TIMESTAMP is not updated in client cache. If it takes time to update the client cache, this approach will allow more writes than those of  previous approach. Make sense?

{noformat}
 @Override
    public void updateIndexState(RpcController controller, UpdateIndexStateRequest request,
            RpcCallback<MetaDataResponse> done) { 
.....
                    // Invalidate from cache
                    Cache<ImmutableBytesPtr,PMetaDataEntity> metaDataCache = GlobalCache.getInstance(this.env).getMetaDataCache();
                    metaDataCache.invalidate(cacheKey);
}
{noformat}

> Option to make data regions not writable when index regions are not available
> -----------------------------------------------------------------------------
>
>                 Key: PHOENIX-2221
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2221
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Devaraj Das
>            Assignee: Alicia Ying Shu
>             Fix For: 4.7.0
>
>         Attachments: PHOENIX-2221-v1.patch, PHOENIX-2221-v2.patch, PHOENIX-2221-v3.patch, PHOENIX-2221.patch
>
>
> In one usecase, it was deemed better to not accept writes when the index regions are unavailable for any reason (as opposed to disabling the index and the queries doing bigger data-table scans).
> The idea is that the index regions are kept consistent with the data regions, and when a query runs against the index regions, one can be reasonably sure that the query ran with the most recent data in the data regions. When the index regions are unavailable, the writes to the data table are rejected. Read queries off of the index regions would have deterministic performance (and on the other hand if the index is disabled, then the read queries would have to go to the data regions until the indexes are rebuilt, and the queries would suffer).



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)