Tim Armstrong has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/9416 )

Change subject: IMPALA-4835: Part 2: Allocate scan range buffers upfront
......................................................................

IMPALA-4835: Part 2: Allocate scan range buffers upfront

This change is a step towards reserving memory for buffers from the
buffer pool and constraining per-scanner memory requirements. This
change restructures the DiskIoMgr code so that each ScanRange operates
with a fixed set of buffers that are allocated upfront and recycled as
the I/O mgr works through the ScanRange.

One major change is that ScanRanges get blocked when a buffer is not
available and get unblocked when a client returns a buffer via
ReturnBuffer(). I was able to remove the logic to maintain the
blocked_ranges_ list by instead adding a separate set with all ranges
that are active.

There is also some miscellaneous cleanup included - e.g. reducing the
amount of code devoted to maintaining counters and metrics.

One tricky part of the existing code was the it called
IssueInitialRanges() with empty lists of files and depended on
DiskIoMgr::AddScanRanges() to not check for cancellation in that case.
See  IMPALA-6564. I changed the logic to not try to issue ranges for
empty lists of files.

I plan to merge this along with the actual buffer pool switch, but
separated it out to allow review of the DiskIoMgr changes separate from
other aspects of the buffer pool switchover.

Testing:
* Ran core and exhaustive tests.

Change-Id: Ia243bf8b62feeea602b122e0503ea4ba7d3ee70f
Reviewed-on: http://gerrit.cloudera.org:8080/8707
Reviewed-by: Tim Armstrong <tarmstr...@cloudera.com>
Tested-by: Tim Armstrong <tarmstr...@cloudera.com>
Reviewed-on: http://gerrit.cloudera.org:8080/9416
---
M be/src/exec/base-sequence-scanner.cc
M be/src/exec/base-sequence-scanner.h
M be/src/exec/hdfs-lzo-text-scanner.cc
M be/src/exec/hdfs-parquet-scanner.cc
M be/src/exec/hdfs-parquet-scanner.h
M be/src/exec/hdfs-scan-node-base.cc
M be/src/exec/hdfs-scan-node-mt.cc
M be/src/exec/hdfs-scan-node.cc
M be/src/exec/scanner-context.cc
M be/src/runtime/bufferpool/buffer-pool.h
M be/src/runtime/io/disk-io-mgr-internal.h
M be/src/runtime/io/disk-io-mgr-stress-test.cc
M be/src/runtime/io/disk-io-mgr-stress.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/disk-io-mgr.h
M be/src/runtime/io/request-context.cc
M be/src/runtime/io/request-context.h
M be/src/runtime/io/request-ranges.h
M be/src/runtime/io/scan-range.cc
M be/src/runtime/tmp-file-mgr.cc
M be/src/runtime/tmp-file-mgr.h
M be/src/util/bit-util-test.cc
M be/src/util/bit-util.h
24 files changed, 1,024 insertions(+), 594 deletions(-)

Approvals:
  Tim Armstrong: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: 2.x
Gerrit-MessageType: merged
Gerrit-Change-Id: Ia243bf8b62feeea602b122e0503ea4ba7d3ee70f
Gerrit-Change-Number: 9416
Gerrit-PatchSet: 3
Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>

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