Sahil Takiar has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/13221


Change subject: IMPALA-8428: Add support for caching file handles on s3
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IMPALA-8428: Add support for caching file handles on s3

This patch is based on work done by Joe McDonnell. This change adds
support for cacheing file handles from S3. It add a new configuration
flag 'cache_s3_file_handles' (set to true by default) which controls
whether or not cacheing of S3 file handles is enabled.

Testing:
* Modified test_hdfs_fd_caching.py so it is enabled for S3 as well as
remote HDFS
* Ran core tests
* Ran TPC-DS on a real cluster and validated that the S3 file handle
cache works as expected
* Ran several test queries on a real cluster with S3Guard enabled and
validated that the S3 file handle cache works as expected

Change-Id: I5b304d37bc724377fbe7955441cce0cec6fb7f19
---
M be/src/runtime/io/disk-io-mgr.cc
M be/src/runtime/io/scan-range.cc
M tests/custom_cluster/test_hdfs_fd_caching.py
3 files changed, 11 insertions(+), 7 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/21/13221/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I5b304d37bc724377fbe7955441cce0cec6fb7f19
Gerrit-Change-Number: 13221
Gerrit-PatchSet: 1
Gerrit-Owner: Sahil Takiar <stak...@cloudera.com>

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