[jira] [Assigned] (HBASE-26273) TableSnapshotInputFormat/TableSnapshotInputFormatImpl should use ReadType.STREAM for scanning HFiles

["Josh Elser (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-26273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Elser reassigned HBASE-26273:
----------------------------------

    Assignee: Josh Elser

> TableSnapshotInputFormat/TableSnapshotInputFormatImpl should use ReadType.STREAM for scanning HFiles 
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-26273
>                 URL: https://issues.apache.org/jira/browse/HBASE-26273
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>    Affects Versions: 3.0.0-alpha-1, 2.4.6
>            Reporter: Tak-Lon (Stephen) Wu
>            Assignee: Josh Elser
>            Priority: Major
>
> After the change in HBASE-17917 that use PREAD ({{ReadType.DEFAULT}}) for all user scan, the behavior of TableSnapshotInputFormat changed from STREAM to PREAD. 
> TableSnapshotInputFormat is supposed to be use with a YARN/MR or other batch engine that should read the entire HFile in the container/executor, with default always to PREAD, the number of connection to HDFS surges and has an side-effect on the overall performance. 
> The goal of this change is to make any downstream using TableSnapshotInputFormat with STREAM scan. 



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