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https://issues.apache.org/jira/browse/CASSANDRA-12381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407916#comment-15407916
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Sylvain Lebresne commented on CASSANDRA-12381:
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bq. Netty had an issue with arrays and direct buffers recently
Cares about sharing the issue? I'm genuinely curious to start with.
But also, I don't doubt that direct ByteBuffer *can* have a backing array. The
javadoc is clear about this. What's less clear to me is that the javadoc seems
to suggest to me that *even* if a direct buffer has a backing array, then it
sounds like accessing that backing array, provided you use {{arrayOffset()}},
should be fine.
> Verify use of ByteBuffer.hasArray() in whole code base
> ------------------------------------------------------
>
> Key: CASSANDRA-12381
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12381
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Stupp
> Assignee: Robert Stupp
> Priority: Minor
> Fix For: 3.0.x
>
>
> As [noted
> here|https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html#allocateDirect-int-],
> a direct {{ByteBuffer}} can have a backing array.
> If a direct {{ByteBuffer}} has a backing array, we should not make any
> assumption on how it is actually used.
> This ticket is about to check whether uses of {{ByteBuffer.hasArray()}} need
> to be replaced with {{ByteBuffer.isDirect()}}.
> (With CASSANDRA-11870 however, there is no way that such a direct
> {{ByteBuffer}} has a backing array.)
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