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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5967) Ineffective check of negative value in CompositeReadOnlyKeyValueStore#approximateNumEntries()
Date Fri, 29 Sep 2017 00:35:01 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16185167#comment-16185167
] 

Matthias J. Sax commented on KAFKA-5967:
----------------------------------------

It's correct. But I did not see any email from you. You need to subscribe to the list first
I think: http://kafka.apache.org/contact

> Ineffective check of negative value in CompositeReadOnlyKeyValueStore#approximateNumEntries()
> ---------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-5967
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5967
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Minor
>              Labels: beginner, newbie
>
> {code}
>         long total = 0;
>         for (ReadOnlyKeyValueStore<K, V> store : stores) {
>             total += store.approximateNumEntries();
>         }
>         return total < 0 ? Long.MAX_VALUE : total;
> {code}
> The check for negative value seems to account for wrapping.
> However, wrapping can happen within the for loop. So the check should be performed inside
the loop.



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