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https://issues.apache.org/jira/browse/HBASE-26273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415642#comment-17415642
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Hudson commented on HBASE-26273:
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Results for branch branch-2.3
[build #293 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2.3/293/]:
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> 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
> Fix For: 2.5.0, 3.0.0-alpha-2, 2.3.7, 2.4.7
>
>
> 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, we executing a lot more DFSInputStream#seek calls to
> simply read through the datablock section of the HFile.
> The goal of this change is to make any downstream using
> TableSnapshotInputFormat with STREAM scan.
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