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From Roland Hänel <rol...@haenel.me>
Subject Re: when i use the OrderPreservingPartition, the load is very imbalance
Date Mon, 26 Apr 2010 10:12:43 GMT
1) you can re-balance a node with

     bin/nodetool -h <host> token [<new-token>]

specify a new token manually or let the system guess one.

2) take a look into your system.log to find out why your nodes are dying.


2010/4/26 刘兵兵 <rucbing@gmail.com>

> i do some INSERT ,because i will do some scan operations, i use the
> OrderPreservingPartition method.
>
> the state of the cluster is showed below.
>
> as i predicated the load is very imbalance, and some of the nodes down (in
> some nodes,the Cassandra processes died and in others the processes are
>
> alive but they still down),
>
> so i have two questions:
>
> 1)how to do balance after the insert ends?
>
> 2)why the nodes died? how to make them up again (when the situation is that
> the process is alive but the node'state is down)
>
> thx
>
> 10.37.17.241  Up         47.65 GB
> 0p6ovvUXMJ4cdd1L                           |<--|
> 10.37.17.234  Up         67.41 GB
> 5OxiS2DKBZLeISPg                          |   ^
> 10.37.17.235  Up         67.54 GB
> 7UDcS0SToePuQACe                         v   |
> 10.37.17.246  Up         555 bytes
> OCvC3nqKLeKA5n0I                           |   ^
> 10.37.17.233  Up         830 bytes
> SJp6cQRNox52av2Y                           v   |
> 10.37.17.249  Up         830 bytes
> SxVmCVcruOpoS48B                           |   ^
> 10.37.17.247  Up         555 bytes
> TGctCMvfNuRo7RjS                           v   |
> 10.37.17.245  Up         555 bytes
> j2smY0OOtQ0SeeHY                           |   ^
> 10.37.17.250  Up         830 bytes
> jNwBPchW58i5tGxp                           v   |
> 10.37.17.248  Up         830 bytes
> jYWaJC93OyMdWDaN                           |   ^
> 10.37.17.237  Up         830 bytes
> mPwhLOsKlbPart6j                           v   |
> 10.37.17.236  Up         830 bytes
> noh0t8HJgw4hmz7I                           |   ^
> 10.37.17.244  Up         555 bytes
> q8c8SPYEkWEzmFcR                           v   |
> 10.37.17.238  Up         555 bytes
> rIuuq3AR4DVK989X                           |   ^
> 10.37.17.242  Up         555 bytes
> smebTmIvQBMG56Zf                           v   |
> 10.37.17.243  Up         555 bytes
> tWTYyiqAKQVw7197                           |   ^
> 10.37.17.232  Up         830 bytes
> uVdBQkR9Dszm5deK                           v   |
> 10.37.17.239  Up         555 bytes
> xXQkDQn1vvg8e1xS                           |   ^
> 10.37.17.240  Up         555 bytes
> yQRrq9RG2dUsHUyR                           |-->|
>
>
> --
> Bingbing Liu
>
> Web and Mobile Data Management lab
>
> Renmin University  of  China
>

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