转发:consult some questions about riak,thank you

270917674 270917674 at qq.com
Fri Jan 13 11:21:28 EST 2017


Dear basho team:
  I encountered a strange question, we use riak/riak-cs build a cluster, the cluster has 7 nodes, DB of riak KV is multi(level & bitcask), earch node has 16G RAM.total_leveldb_mem_percent=50.
  today we found one node crash down but without crash log, and erlang log has something like this:
   terminate called after throwing an instance of 'std::bad_akkic' wath(): std::bad_alloc
   (riak kv version:2.0.5)
   [os_mon] memory supervisor port(memsup):Erlang has closed;
   [os_mon] cpu supervisor port(cpu_sup):Erlang has close.
 And we restart this node and it can work properly again, use the (free -m) command to view the memory, +-buffered/cache: used=2000Mb available<14000Mb. and memory status of other nodes are: used 6000Mb~7000Mb.
can you help me analysis of why the node crash down?
and i found other problem on other cluster. under normal conditions,the memory of used was 4000Mb~5000Mb,but 
every 20 minutes will rise once, about doubled, and then returned to normal, why?

thank you very much!
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