[jira] [Commented] (KAFKA-5876) IQ should throw different exceptions for different errors

["Pegerto Fernandez (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-5876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344789#comment-16344789 ] 

Pegerto Fernandez commented on KAFKA-5876:
------------------------------------------

Hi,

In addition to the original comment.

When the local store is not created, or is  not yet assign to a task. InvalidStateStoreException its ambiguous and do not provide information about a not existing vs not available datastore.

Regards

> IQ should throw different exceptions for different errors
> ---------------------------------------------------------
>
>                 Key: KAFKA-5876
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5876
>             Project: Kafka
>          Issue Type: Task
>          Components: streams
>            Reporter: Matthias J. Sax
>            Assignee: Vito Jeng
>            Priority: Major
>              Labels: needs-kip, newbie++
>             Fix For: 1.2.0
>
>
> Currently, IQ does only throws {{InvalidStateStoreException}} for all errors that occur. However, we have different types of errors and should throw different exceptions for those types.
> For example, if a store was migrated it must be rediscovered while if a store cannot be queried yet, because it is still re-created after a rebalance, the user just needs to wait until store recreation is finished.
> There might be other examples, too.



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