Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/12083#issuecomment-204503222
@liyezhang556520 ah, I see. Thanks for the pointer. So basically, if the
source buffer is not a direct buffer, that class is making a copy of the whole
source buffer before trying to write it to the channel. That's, uh, a little
silly, but I guess it's something we have to live with...
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