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

["Tak-Lon (Stephen) Wu (Jira)" <ji...@apache.org>]

Tak-Lon (Stephen) Wu created HBASE-26273:
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             Summary: 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: 2.4.6, 3.0.0-alpha-1
            Reporter: Tak-Lon (Stephen) Wu


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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