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From "Tim Armstrong (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-7138: detect devicemapper volumes correctly
Date Wed, 01 Apr 2020 19:02:49 GMT
Tim Armstrong has uploaded this change for review. (

Change subject: IMPALA-7138: detect devicemapper volumes correctly

IMPALA-7138: detect devicemapper volumes correctly

This is a more general fix for device detection that
disables the digit-stripping heuristic if a device
with the same name as a partition already exists.

E.g. for device-mapper devices, /proc/partitions might
include a partition called "dm-0" that maps directly
to the block device "dm-0" (i.e. /sys/block/dm-0).
Before this fix, we looked for a device called "dm-",
which did not exist.

Created a dummy device-mapper device with the following command:

  sudo dmsetup create 1gb-zero --table '0 1953125 zero'

Then confirmed that the device name in the logs was correct

    dm-0 (rotational=true)

Other devices - sda, sda1, sda2, sdb, sdb1, etc on my system
were still detected the same as before.

Change-Id: I9d231bcf9105db8d4ab03586eab74e0644337a6f
M be/src/util/
M be/src/util/
M be/src/util/filesystem-util.h
3 files changed, 48 insertions(+), 15 deletions(-)

  git pull ssh:// refs/changes/31/15631/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I9d231bcf9105db8d4ab03586eab74e0644337a6f
Gerrit-Change-Number: 15631
Gerrit-PatchSet: 1
Gerrit-Owner: Tim Armstrong <>

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