Hi,
I want to backup the files needed for data restoring/data migration. There
are several directories:
/var/lib/cassandra/
- commitlog/
- data/
- mytable/
- system/
- system_traces/
Hi, I am curious about the underlying implementation of the CQL native
binary protocol. It is also a RPC protocol, right? But how can it
outperform thrift as they are both RPC protocol?
The Cassandra driver has already implemented this native binary protocol,
could anyone tell me which part of the
Hi,
I am using Cassandra stress tool provided in the distribution 2.1.2. I
wonder what does the "-node" argument mean. Dose it specify the cluster
server node or stress client node?
In the document, it says
"Splitting up a load over multiple cassandra-stress instances on different
nodes: This is
stributed cluster with the native protocol) - it eliminates the effort to
> parse CQL statement again and again.
>
>
> Am 08.12.2014 um 09:26 schrieb 孔嘉林 :
>
> Thanks Jonathan, actually I'm wondering how CQL is implemented underlying,
> a different RPC mechanism? Why it is faster
Cassandra (and not your
> code)
> http://www.datastax.com/dev/blog/improved-cassandra-2-1-stress-tool-benchmark-any-schema
>
> ===
> Chris Lohfink
>
> On Sun, Dec 7, 2014 at 9:48 PM, 孔嘉林 wrote:
>
>> Hi Eric,
>> Thank you very much for your reply!
>> Do you
d be helpful if you sent out a link to the repo, since currently we
> have no way of knowing if you've got a client side bug (data model or code)
> that's limiting your performance.
>
>
> On Sun Dec 07 2014 at 7:55:16 PM 孔嘉林 wrote:
>
>> I find under the src/client fold
I find under the src/client folder of Cassandra 2.1.0 source code, there is
a *RingCache.java* file. It uses a thrift client calling the*
describe_ring()* API to get the token range of each Cassandra node. It is
used on the client side. The client can use it combined with the
partitioner to get the
Hi Eric,
Thank you very much for your reply!
Do you mean that I should clear my table after each run? Indeed, I can see
several times of compaction during my test, but could only a few times
compaction affect the performance that much? Also, I can see from the
OpsCenter some ParNew GC happen but no
