Uploaded fix to lucid-proposed. ** Changed in: memcached (Ubuntu Lucid) Status: Triaged => Fix Committed
** Description changed: + == SRU REPORT == + + IMPACT: users who try to use memcached with large multi-gets will get a + cache miss every time. + + TEST CASE: + + * install php5-cli and php5-memcached + * run this code using 'php': + + $m = new Memcached(); + $m->addServer('localhost', 11211); + $keys = array(); + for ($i=0; $i<50000; $i++) { + $key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::foo::' . $i; + $keys[] = $key; + } + $result = $m->getMulti($keys, $cas); + var_dump($result, $cas); + var_dump($m->getResultCode()); + + * Result if affected by bug will be: + bool(false) + NULL + int(19) + + * Result if fixed will be: + + array(0) { + } + array(0) { + } + int(0) + + REGRESSION POTENTIAL: This change makes the patch *more* like the + upstream fix, which has been in every version of memcached since Ubuntu + 10.10, and has not caused regressions. + + ====== + + Binary package hint: memcached * Ubuntu release. - Description: Ubuntu 10.04 LTS - Release: 10.04 + Description: Ubuntu 10.04 LTS + Release: 10.04 * How to reproduce the bug? Send several large multiget requests to a Ubuntu 1.4.2 Memcached server, and you'll notice that some of them will break, and other will return only a subset of the requested keys. You can use the following PHP test code: $m = new Memcached(); $m->addServer('localhost', 11211); $keys = array(); for ($i=0; $i<50000; $i++) { - $key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::foo::' . $i; - $keys[] = $key; + $key = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx::foo::' . $i; + $keys[] = $key; } $result = $m->getMulti($keys, $cas); var_dump($result, $cas); var_dump($m->getResultCode()); - * How to fix de bug? Rebuilding the server without the fix-issue-102-segfault & fix-ubuntu- ftbfs patches fixes that bug for us. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/637114 Title: Large multiget requests randomly broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/memcached/+bug/637114/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs