|
| 1 | + |
| 2 | +Bugs, Known Issues and Insufficiencies |
| 3 | +====================================== |
| 4 | + |
| 5 | +libhashkit |
| 6 | +---------- |
| 7 | + |
| 8 | +libhashkit is not usable for general purpose hashing, because it is geared to |
| 9 | +usage by libmemcached. |
| 10 | + |
| 11 | +MurMur |
| 12 | +^^^^^^ |
| 13 | + |
| 14 | +Hashkit's MurMur/MurMur3 are limited to the lower 32 bits. |
| 15 | + |
| 16 | +crc32 |
| 17 | +^^^^^ |
| 18 | + |
| 19 | +Commit "\ `More Hashing methods <https://github.com/awesomized/libmemcached/commits/1207354f>`_\ " |
| 20 | +from October 2007 first released in v0.8, which main intention seems to have |
| 21 | +been to add FNV1 hash algos, changed the result of the crc32 hash to only its |
| 22 | +upper 16 bits sans MSB, without any additional comment. |
| 23 | + |
| 24 | +The implementations referred to in the file header (Postgres and BSD) |
| 25 | +do not exhibit this behavior. |
| 26 | + |
| 27 | +A `bug report <https://bugs.launchpad.net/libmemcached/+bug/604178>`_ was |
| 28 | +filed three years later on launchpad, which was marked ``Won't fix`` with |
| 29 | +the comment that it was for compatibility with other "drivers", which |
| 30 | +supposedly refers to other memcached client libraries. |
| 31 | + |
| 32 | +libmemcached |
| 33 | +------------ |
| 34 | + |
| 35 | +Replication |
| 36 | +^^^^^^^^^^^ |
| 37 | + |
| 38 | +This is a somewhat badly named feature, because it **does not** provide |
| 39 | +any of the guaranties one would expect from a proper replication. |
| 40 | + |
| 41 | +One can set the intended number of additional servers where data should |
| 42 | +be stored with the behavior ``MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS`` and |
| 43 | +specify whether ``MGET``\ s/\ ``GET``\ s should read from a random server with |
| 44 | +``MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ``. ``DELETE``\ s will try to |
| 45 | +delete the key from all replicas. |
| 46 | + |
| 47 | +The binary protocol is required and any other command is unaffected. |
| 48 | + |
| 49 | +TLS/SSL |
| 50 | +^^^^^^^ |
| 51 | + |
| 52 | +libmemcached does not support TLS/SSL, yet. |
| 53 | +See `github issue #37 <https://github.com/awesomized/libmemcached/issues/37>`_. |
| 54 | + |
| 55 | +Coroutines and event loops |
| 56 | +^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| 57 | + |
| 58 | +libmemcached does not support explicit asynchronous usage, yet. |
| 59 | +See `github issue #54 <https://github.com/awesomized/libmemcached/issues/54>`_. |
| 60 | + |
| 61 | +META protocol |
| 62 | +^^^^^^^^^^^^^ |
| 63 | + |
| 64 | +libmemcached deos not support memcached's META protocol, yet. |
| 65 | +See `github issue #121 <https://github.com/awesomized/libmemcached/issues/121>`_. |
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