[jira] [Commented] (HBASE-21946) Replace the byte[] pread by ByteBuffer pread in HFileBlock reading once HDFS-3246 prepared

["Reid Chan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167841#comment-17167841 ] 

Reid Chan commented on HBASE-21946:
-----------------------------------

Looks like it gets blocked by HDFS-3246 which applied to hadoop 3+ only

> Replace the byte[] pread by ByteBuffer pread in HFileBlock reading once HDFS-3246 prepared
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-21946
>                 URL: https://issues.apache.org/jira/browse/HBASE-21946
>             Project: HBase
>          Issue Type: Improvement
>          Components: Offheaping
>            Reporter: Zheng Hu
>            Assignee: Zheng Hu
>            Priority: Critical
>             Fix For: 3.0.0-alpha-1, 2.3.1, 2.4.0
>
>         Attachments: HBASE-21946.HBASE-21879.v01.patch, HBASE-21946.HBASE-21879.v02.patch, HBASE-21946.HBASE-21879.v03.patch, HBASE-21946.HBASE-21879.v04.patch
>
>
> [~stakiar] is working on HDFS-3246,  so now we have to keep the byte[] pread in HFileBlock reading.  Once it get resolved, we can upgrade the hadoop version and do the replacement. 
> I think it will be a great p999 latency improvement in 100% Get case, anyway file a issue address this firstly. 



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