[Impala-ASF-CR] IMPALA-5240: Allow config of number of disk I/O threads per disk type

["Bikramjeet Vig (Code Review)" <ge...@cloudera.org>]

Bikramjeet Vig has uploaded a new patch set (#2).

Change subject: IMPALA-5240: Allow config of number of disk I/O threads per disk type
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IMPALA-5240: Allow config of number of disk I/O threads per disk type

Currently Impala defaults to 8 threads per flash disk and 1 thread per
rotational disk. This can be overridden with --num_threads_per_disk,
but that sets the thread count independent of disk type.

This would allow control of the number of disk I/O threads spawned
independently for solid state disks using
"--num_io_threads_per_solid_state_disk" and for rotational disks using
"--num_io_threads_per_rotational_disk" as startup parameters.

Testing:
Tested manually. Unfortunately, there is no way using DiskIoMgr class
to confirm these variables were set, therefore no automated backend
tests were added.

Change-Id: I094aff3747104104fe0465d73dcdbef5d9892f7c
---
M be/src/runtime/disk-io-mgr.cc
M be/src/runtime/disk-io-mgr.h
M fe/src/test/java/org/apache/impala/testutil/SentryServicePinger.java
3 files changed, 28 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/32/7232/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I094aff3747104104fe0465d73dcdbef5d9892f7c
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <mj...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>