Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/12402 )

Change subject: Adding hostname to Disk I/O errors.
......................................................................

Adding hostname to Disk I/O errors.

I recently ran into some queries that failed like so:

  WARNINGS: Disk I/O error: Could not open file: /data/...: Error(5): 
Input/output error

These warnings were in the profile, but I had to cross-reference impalad
logs to figure out which machine had the broken disk.

In this commit, I've sprinkled GetBackendString() to include it.

Change-Id: Ib977d2c0983ef81ab1338de090239ed57f3efde2
Reviewed-on: http://gerrit.cloudera.org:8080/12402
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/exprs/timezone_db.cc
M be/src/runtime/io/disk-io-mgr-test.cc
M be/src/runtime/io/disk-io-mgr.cc
M be/src/runtime/io/error-converter.cc
M be/src/runtime/io/hdfs-file-reader.cc
M be/src/runtime/io/hdfs-monitored-ops.cc
M be/src/runtime/io/local-file-reader.cc
M common/thrift/generate_error_codes.py
8 files changed, 23 insertions(+), 20 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ib977d2c0983ef81ab1338de090239ed57f3efde2
Gerrit-Change-Number: 12402
Gerrit-PatchSet: 4
Gerrit-Owner: Philip Zeyliger <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Lars Volker <[email protected]>
Gerrit-Reviewer: Philip Zeyliger <[email protected]>

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