id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
11270	Cache templatetag with memcached can't handle long tags	235	nobody	"similar to #10016
Memcached has a hard limit of 250 characters for cache keys.

So we have to use md5 hash instead of the whole cached tag name with all vary variables.

{{{
Traceback (most recent call last):

  File ""/var/www/virtual/sumno.com/modules/django/core/handlers/base.py"", line 86, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File ""/var/www/virtual/sumno.com/htdocs/sumnocom/apps/lib/decorators.py"", line 56, in wrapper
    return func(request, *args, **kwargs)

  File ""/var/www/virtual/sumno.com/htdocs/sumnocom/../sumnocom/apps/generic_content/views.py"", line 370, in detail_view_content_entry
    context_instance=RequestContext(request))

  File ""/var/www/virtual/sumno.com/modules/django/shortcuts/__init__.py"", line 18, in render_to_response
    return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader.py"", line 107, in render_to_string
    return t.render(context_instance)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 176, in render
    return self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader_tags.py"", line 97, in render
    return compiled_parent.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 176, in render
    return self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader_tags.py"", line 97, in render
    return compiled_parent.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 176, in render
    return self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader_tags.py"", line 24, in render
    result = self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/htdocs/sumnocom/apps/lib/templatetags/smartspaceless.py"", line 17, in render
    s = self.nodelist.render(context).strip()

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader_tags.py"", line 24, in render
    result = self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/loader_tags.py"", line 24, in render
    result = self.nodelist.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 768, in render
    bits.append(self.render_node(node, context))

  File ""/var/www/virtual/sumno.com/modules/django/template/__init__.py"", line 781, in render_node
    return node.render(context)

  File ""/var/www/virtual/sumno.com/modules/django/templatetags/cache.py"", line 27, in render
    value = cache.get(cache_key)

  File ""/var/www/virtual/sumno.com/modules/django/core/cache/backends/memcached.py"", line 25, in get
    val = self._cache.get(smart_str(key))

  File ""/var/lib/python-support/python2.5/memcache.py"", line 619, in get
    check_key(key)

  File ""/var/lib/python-support/python2.5/memcache.py"", line 885, in check_key
    % SERVER_MAX_KEY_LENGTH)

MemcachedKeyLengthError: Key length is > 250
}}}"		closed	Core (Cache system)	dev		fixed			Accepted	1	0	1	0	0	0