[jira] [Commented] (CASSANDRA-13606) Improve handling of 2i initialization failures

["ZhaoYang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-13606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125857#comment-17125857 ] 

ZhaoYang commented on CASSANDRA-13606:
--------------------------------------

bq. I'm not sure about what making the index not available for writes should mean...

Not sure why index needs to skip writes when its build failed...if no index uses `LoadType read/no_op`, having `writableIndex` is giving extra overhead..

Perhaps we should unify both {{`queryableIndex`}} and {{`writableIndex`}} into {{`indexStatus`}}, aka. "Map<String, LoadType>".

> Improve handling of 2i initialization failures
> ----------------------------------------------
>
>                 Key: CASSANDRA-13606
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13606
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Feature/2i Index
>            Reporter: Sergio Bossa
>            Assignee: Berenguer Blasi
>            Priority: Normal
>             Fix For: 4.0-alpha5
>
>          Time Spent: 8h 40m
>  Remaining Estimate: 0h
>
> CASSANDRA-10130 fixes the 2i build management, but initialization failures are still not properly handled, most notably because:
> * Initialization failures make the index non-queryable, but it can still be written to.
> * Initialization failures can be recovered via full rebuilds.
> Both points above are probably suboptimal because the initialization logic could be more complex than just an index build, hence it shouldn't be made recoverable via a simple rebuild, and could cause the index to be fully unavailable not just for reads, but for writes as well.
> So, we should better handle initialization failures by:
> * Allowing the index implementation to specify if unavailable for reads, writes, or both. 
> * Providing a proper method to recover, distinct from index rebuilds.



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