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https://issues.apache.org/jira/browse/HBASE-22496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil updated HBASE-22496:
-----------------------------------------
Status: Patch Available (was: Open)
> UnsafeAccess.unsafeCopy should not copy more than UNSAFE_COPY_THRESHOLD on
> each iteration
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-22496
> URL: https://issues.apache.org/jira/browse/HBASE-22496
> Project: HBase
> Issue Type: Improvement
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Attachments: HBASE-22496.master.001.patch
>
>
> In *UnsafeAccess.unsafeCopy*, we calculate a _size_ __ to be read, no greater
> than UNSAFE_COPY_THRESHOLD, if total _len_ is larger than
> UNSAFE_COPY_THRESHOLD:
> {noformat}
> long size = (len > UNSAFE_COPY_THRESHOLD) ? UNSAFE_COPY_THRESHOLD : len;
> {noformat}
> But then we simply read the whole len anyway:
> {noformat}
> theUnsafe.copyMemory(src, srcAddr, dst, destAddr, len);
> {noformat}
> I believe the real intention here is to copy chunks of _size_ bytes, the
> current code is already copying everything on the first iteration, then
> performing additional chunked copies.
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