Putting Specific Bucket/Key Combination Gives Timeout

Sean Cribbs sean at basho.com
Mon Mar 14 08:45:03 EDT 2011


We are aware of some race-conditions caused by repeatedly accessing a key around DELETE requests.  Here's one bug:

https://issues.basho.com/show_bug.cgi?id=555

If you need to clear the data after a test run, I would suggest using the 'riak_kv_test_backend' from the Ripple project, or simply shut down Riak and delete the contents of the bitcask directory.

Sean Cribbs <sean at basho.com>
Developer Advocate
Basho Technologies, Inc.
http://basho.com/

On Mar 14, 2011, at 8:27 AM, Runar Jordahl wrote:

> I am running unit tests against my single-node Riak database installed
> on Ubuntu 10.10 64 bit. The tests write a few objects (key/value) to
> the database, and then end by deleting all keys in the test bucket.
> The test bucket is named “epigenttest”, the key I use is “test”.
> 
> Today the database entered a state where my default bucket/key used
> for tests failed: If I tried doing a PUT using the following URL, I
> got a timeout:
> http://riaktest:8098/riak/epigenttest/test
> 
> However, if I modified the bucket or the key, the operation worked.
> 
> I could always reproduce the problem using bucket/key
> epigenttest/test. I suspect that the database had corrupt data, which
> prevented me from putting epigenttest/test.
> 
> Before running the unit test, Riak reported that the database was empty:
> http://riaktest:8098/riak?buckets=true
> {"buckets":[]}
> 
> I managed to get out of the problem by running “riak reboot”. I cannot
> reproduce the problem again.
> 
> Could there be a bug in Riak when adding/deleting/putting the same
> key? Below I include the result of running Riak Stats.
> 
> 
> Kind regards
> Runar Jordahl
> 
> 
> 
> http://riaktest:8098/stats
> {
>    "vnode_gets": 3,
>    "vnode_puts": 0,
>    "read_repairs": 0,
>    "vnode_gets_total": 1277,
>    "vnode_puts_total": 511,
>    "node_gets": 1,
>    "node_gets_total": 427,
>    "node_get_fsm_time_mean": 25691.0,
>    "node_get_fsm_time_median": 25691,
>    "node_get_fsm_time_95": 25691,
>    "node_get_fsm_time_99": 25691,
>    "node_get_fsm_time_100": 25691,
>    "node_puts": 1,
>    "node_puts_total": 201,
>    "node_put_fsm_time_mean": 60000872.0,
>    "node_put_fsm_time_median": 60000872,
>    "node_put_fsm_time_95": 60000872,
>    "node_put_fsm_time_99": 60000872,
>    "node_put_fsm_time_100": 60000872,
>    "read_repairs_total": 5,
>    "cpu_nprocs": 292,
>    "cpu_avg1": 56,
>    "cpu_avg5": 61,
>    "cpu_avg15": 64,
>    "mem_total": 1050324992,
>    "mem_allocated": 521408512,
>    "nodename": "riak at 127.0.0.1",
>    "connected_nodes": [
> 
>    ],
>    "sys_driver_version": "1.5",
>    "sys_global_heaps_size": 0,
>    "sys_heap_type": "private",
>    "sys_logical_processors": 1,
>    "sys_otp_release": "R13B04",
>    "sys_process_count": 212,
>    "sys_smp_support": false,
>    "sys_system_version": "Erlang R13B04 (erts-5.7.5) [source] [rq:1]
> [async-threads:64] [kernel-poll:true]",
>    "sys_system_architecture": "i486-pc-linux-gnu",
>    "sys_threads_enabled": true,
>    "sys_thread_pool_size": 64,
>    "sys_wordsize": 4,
>    "ring_members": [
>        "riak at 127.0.0.1"
>    ],
>    "ring_num_partitions": 64,
>    "ring_ownership": "[{'riak at 127.0.0.1',64}]",
>    "ring_creation_size": 64,
>    "storage_backend": "riak_kv_bitcask_backend",
>    "pbc_connects_total": 0,
>    "pbc_connects": 0,
>    "pbc_active": 0,
>    "cluster_info_version": "1.0.0",
>    "luwak_version": "1.0.0",
>    "skerl_version": "1.0.0",
>    "riak_kv_version": "0.14.0",
>    "riak_core_version": "0.14.0",
>    "bitcask_version": "1.1.5",
>    "luke_version": "0.2.3",
>    "webmachine_version": "1.8.0",
>    "mochiweb_version": "1.7.1",
>    "erlang_js_version": "0.5.0",
>    "runtime_tools_version": "1.8.3",
>    "crypto_version": "1.6.4",
>    "os_mon_version": "2.2.5",
>    "riak_err_version": "1.0.0",
>    "sasl_version": "2.1.9",
>    "stdlib_version": "1.16.5",
>    "kernel_version": "2.13.5",
>    "executing_mappers": 0
> }
> 
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