mahesh kumar behera created HIVE-20517:
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Summary: Creation of staging directory and Move operation is
taking time in S3
Key: HIVE-20517
URL: https://issues.apache.org/jira/browse/HIVE-20517
Project: Hive
Issue Type: Bug
Components: repl
Affects Versions: 4.0.0
Reporter: mahesh kumar behera
Assignee: mahesh kumar behera
Fix For: 4.0.0
Operations like insert and add partition creates a staging directory to
generate the files and then move the files created to actual location. In
replication flow, the files are first copied to the staging directory and then
moved (rename) to the actual table location. In case of S3, move is not an
atomic operation. It internally does a copy and delete. So it can not guarantee
the consistency required. So it is better to copy the files directly to the
actual location. This will help in avoiding the staging directory creation
(which takes 1-2 seconds in s3) and move (which takes time proportional to file
size).
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