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From "Impala Public Jenkins (Code Review)" <>
Subject [Impala-ASF-CR] Download toolchain in parallel.
Date Tue, 10 Oct 2017 01:25:27 GMT
Impala Public Jenkins has submitted this change and it was merged. (

Change subject: Download toolchain in parallel.

Download toolchain in parallel.

By downloading from the toolchain S3 buckets in parallel with
extracting them, this improves bootstrap_toolchain on my machine
from about 1m5s to about 30s.

  $rm -rf toolchain; time bin/ > /dev/null

  real    0m29.226s
  user    0m46.516s
  sys     0m33.820s

On a large EC2 machine, closer to the S3 buckets, the new time is 21s.

Because multiprocessing hasn't always been available (python2.4 on RHEL5
won't have it), I fall back to a simpler implementation

Change-Id: I46a6088bb002402c7653dbc8257dff869afb26ec
Reviewed-by: Tim Armstrong <>
Reviewed-by: Alex Behm <>
Reviewed-by: Michael Brown <>
Tested-by: Impala Public Jenkins
M bin/
1 file changed, 30 insertions(+), 7 deletions(-)

  Tim Armstrong: Looks good to me, but someone else must approve
  Alex Behm: Looks good to me, approved
  Michael Brown: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I46a6088bb002402c7653dbc8257dff869afb26ec
Gerrit-Change-Number: 8237
Gerrit-PatchSet: 2
Gerrit-Owner: Philip Zeyliger <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Michael Brown <>
Gerrit-Reviewer: Tim Armstrong <>

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