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https://issues.apache.org/jira/browse/HBASE-14940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15046323#comment-15046323
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Anoop Sam John commented on HBASE-14940:
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{quote}
Comparison to true/false in {{if}} conditions is confusing. It is appropriate
to use the operator "!" instead of comparison to false.
FusszyRowFilter might be appropriate to using polymorphism, making it an
abstract class with a static factory method.
{quote}
All existing code.. Only change is checking whether unaligned rather than
Unsafe avail.. So FusszyRowFilter changes we can do in another IA jira.. You
mind doing such cleanup? If so pls raise a Jira.
> Make our unsafe based ops more safe
> -----------------------------------
>
> Key: HBASE-14940
> URL: https://issues.apache.org/jira/browse/HBASE-14940
> Project: HBase
> Issue Type: Bug
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Attachments: HBASE-14940.patch
>
>
> Thanks for the nice findings [~ikeda]
> This jira solves 3 issues with Unsafe operations and ByteBufferUtils
> 1. We can do sun unsafe based reads and writes iff unsafe package is
> available and underlying platform is having unaligned-access capability. But
> we were missing the second check
> 2. Java NIO is doing a chunk based copy while doing Unsafe copyMemory. The
> max chunk size is 1 MB. This is done for "A limit is imposed to allow for
> safepoint polling during a large copy" as mentioned in comments in Bits.java.
> We are also going to do same way
> 3. In ByteBufferUtils, when Unsafe is not available and ByteBuffers are off
> heap, we were doing byte by byte operation (read/copy). We can avoid this and
> do better way.
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