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Posted to hdfs-issues@hadoop.apache.org by "Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org> on 2018/08/29 23:44:00 UTC
[jira] [Commented] (HDDS-372) There are two buffer copies in
ChunkOutputStream
[ https://issues.apache.org/jira/browse/HDDS-372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596937#comment-16596937 ]
Tsz Wo Nicholas Sze commented on HDDS-372:
------------------------------------------
HDDS-372.20180829.patch: 1st patch
> There are two buffer copies in ChunkOutputStream
> ------------------------------------------------
>
> Key: HDDS-372
> URL: https://issues.apache.org/jira/browse/HDDS-372
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Components: Ozone Client
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Priority: Major
> Attachments: HDDS-372.20180829.patch
>
>
> Currently, there are two buffer copies in ChunkOutputStream
> # from byte[] to ByteBuffer, and
> # from ByteBuffer to ByteString.
> We should eliminate the ByteBuffer in the middle.
> For zero copy io, we should support WritableByteChannel instead of OutputStream. It won't be done in this JIRA.
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