yahoo-eng-team team mailing list archive

[Scott Moser <smoser@xxxxxxxxxx>]

Public bug reported:

wait_for_url takes a 'max_wait' input, and then does:
 start = time.time()
 ...
  now = time.time()

The problem is that when this runs early in boot, ntp (or anything else
really) might have set the clock backwards.

I'm looking at a console log that shows:
2014-01-27 14:46:24,743 - url_helper.py[WARNING]: Calling 'http://169.254.169.2
4/2009-04-04/meta-data/instance-id' failed [-16620/120s]: request error [(<urll
compat_monitor0 console  

Ie, the clock got set back 17000 seconds or something.

Asking in # python, I was told that in python3.3 I could use
'time.monotonic'.

In python 2.X, it seems that reading /proc/cpuinfo might be my only
option.

** Affects: cloud-init
     Importance: Medium
         Status: Confirmed

** Changed in: cloud-init
       Status: New => Confirmed

** Changed in: cloud-init
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1273255

Title:
  wait_for_url doesn't account for system clock being changed

Status in Init scripts for use on cloud images:
  Confirmed

Bug description:
  wait_for_url takes a 'max_wait' input, and then does:
   start = time.time()
   ...
    now = time.time()

  The problem is that when this runs early in boot, ntp (or anything
  else really) might have set the clock backwards.

  I'm looking at a console log that shows:
  2014-01-27 14:46:24,743 - url_helper.py[WARNING]: Calling 'http://169.254.169.2
  4/2009-04-04/meta-data/instance-id' failed [-16620/120s]: request error [(<urll
  compat_monitor0 console  

  Ie, the clock got set back 17000 seconds or something.

  Asking in # python, I was told that in python3.3 I could use
  'time.monotonic'.

  In python 2.X, it seems that reading /proc/cpuinfo might be my only
  option.

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