Description
hfile preads all the time at moment. its good we do this when we want to up our random reads. but apparently pread involves open socket, seek, read, close socket whereas seek+read could leave us aligned at next block to read and make for some savings. hfile could have a short memory and change how it pulls from hdfs dependent on recent history.
Attachments
Issue Links
- is blocked by
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HBASE-2180 Bad random read performance from synchronizing hfile.fddatainputstream
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- Closed
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