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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15563) 'counter' may overflow in BoundedGroupingStrategy
Date Sun, 01 May 2016 11:25:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15265725#comment-15265725
] 

Duo Zhang commented on HBASE-15563:
-----------------------------------

What about using a rotate algorithm? I mean, reset the counter value to 0 if it is already
beyond the length of groupNames? AtomicLong can still overflow theoretically...

Thanks.

> 'counter' may overflow in BoundedGroupingStrategy
> -------------------------------------------------
>
>                 Key: HBASE-15563
>                 URL: https://issues.apache.org/jira/browse/HBASE-15563
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>            Reporter: Duo Zhang
>            Assignee: Matt Warhaftig
>            Priority: Minor
>              Labels: beginner
>         Attachments: hbase-15563-v1.patch
>
>
> {code}
> groupName = groupNames[counter.getAndIncrement() % groupNames.length];
> {code}
> Theoretically, counter can overflow and becomes negative then causes an ArrayIndexOutOfBoundsException.
> But in practice, we need 2 billions different identifiers to make this happen, and before
the overflow we will run into OOM because of a huge groupNameCache...
> So not sure if it is worth to fix



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