yahoo-eng-team team mailing list archive

[Haneef Ali <1418678@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Eventhough dogpile caching is disabled,  most of the calls generate the
following three lines

2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] NeedRegenerationException _enter /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:94
2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] no value, waiting for create lock _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:127
2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] value creation lock <dogpile.cache.region._LockWrapper object at 0x7f852d8fd650> acquired _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:131
2015-02-03 15:17:13.042 30043 DEBUG dogpile.core.dogpile [-] Calling creation function _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:148
2015-02-03 15:17:13.048 30043 DEBUG dogpile.core.dogpile [-] Released creation lock _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:154


Worrying aspect in this log is "NeedRegenerationException"

Related code fragment from doppile is  ---
 def _enter(self):
        value_fn = self.value_and_created_fn

        try:
            value = value_fn()
            value, createdtime = value 
        except NeedRegenerationException:
            log.debug("NeedRegenerationException")
            value = NOT_REGENERATED
            createdtime = -1

This is obvious exception , it is throwing error  since caching is
disabled and there is no key.

Is there a way to bypass  this code when caching is disabled? This can
very well be a performance problem as this exception is generated for
almost every call .

** Affects: keystone
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1418678

Title:
  Most of the keystone calls generate exception in dogpile when caching
  is disabled

Status in OpenStack Identity (Keystone):
  New

Bug description:
  Eventhough dogpile caching is disabled,  most of the calls generate
  the  following three lines

  2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] NeedRegenerationException _enter /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:94
  2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] no value, waiting for create lock _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:127
  2015-02-03 15:17:13.041 30043 DEBUG dogpile.core.dogpile [-] value creation lock <dogpile.cache.region._LockWrapper object at 0x7f852d8fd650> acquired _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:131
  2015-02-03 15:17:13.042 30043 DEBUG dogpile.core.dogpile [-] Calling creation function _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:148
  2015-02-03 15:17:13.048 30043 DEBUG dogpile.core.dogpile [-] Released creation lock _enter_create /opt/stack/venvs/openstack/lib/python2.7/site-packages/dogpile/core/dogpile.py:154

  
  Worrying aspect in this log is "NeedRegenerationException"

  Related code fragment from doppile is  ---
   def _enter(self):
          value_fn = self.value_and_created_fn

          try:
              value = value_fn()
              value, createdtime = value 
          except NeedRegenerationException:
              log.debug("NeedRegenerationException")
              value = NOT_REGENERATED
              createdtime = -1

  This is obvious exception , it is throwing error  since caching is
  disabled and there is no key.

  Is there a way to bypass  this code when caching is disabled? This can
  very well be a performance problem as this exception is generated for
  almost every call .

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