Rule of thumb, you should identify two servers in the cluster to be your
seed nodes.
Is this rule same for N node cluster? Any common practice/formula for seed
number?
Going to use about 10 nodes and extend it in a future.
--
Evgeniy Ryabitskiy
Thanks a lot!
Maybe this should be placed at Cassandra FAQ.
http://wiki.apache.org/cassandra/FAQ#seed has less information.
--
Evgeniy Ryabitskiy
Hi,
If you want to store files with partition/replication, you could use
Distributed File System(DFS).
Like http://hadoop.apache.org/hdfs/
or any other:
http://en.wikipedia.org/wiki/Distributed_file_system
Still you could use Cassandra to store any metadata and filepath in DFS.
So: Cassandra +
Hi,
we have 4 node Cassandra (version 0.8.1) cluster. 2 CF inside. While first
CF is working properly (read/store), get_range_slices query on second CF
return NPE error.
Any idea why it happen? Maybe some known bug and fixed in 0.8.3 ?
ERROR [pool-2-thread-51] 2011-08-25 15:02:04,360
Hi
Actually you can use LOCAL_QUORUM and EACH_QUORUM policy everywhere on
DEV/QA/Prod.
Even it would be better for integration tests to use same Consistency level
as on production.
For production with multiple DC you usually need to chouse between 2 common
solutions: Geographical Distribution or
So.
You have created keyspace with SimpleStrategy.
If you want to use *LOCAL_QUORUM, *you should create keyspace (or change
existing) with NetworkTopologyStrategy.
I have provided CLI examples on how to do it. If you are creating keyspace
from Hector, you have to do same via Java API.
Evgeny.
Hi,
I'am trying to store record with EACH_QUORUM consistency and RF=3. While
same thing with RF=2 is working.
Could some one tell me why EACH_QUORUM is working with RF=2 but not with RF
=3
I have 7 nodes cluster. All nodes are UP.
Here is simple CLI script:
create keyspace kspace3
with
One more thing, Cassandra version is 0.8.4.
And if I try same thing from Pelops(thrift), I get UnavailableException.
great thanks!
Evgeny.
Hi,
We have an issue to search over Cassandra and we are using Sphinx for
indexing.
Because of Sphinx architecture we can't use range queries over all fields
that we need to.
So we have to run Sphinx Query first to get List of rowKeys and perform
additional range filtering over column values.
Something like this.
Actually I think it's better to extend get_indexed_slice() API instead of
creating new one thrift method.
I wish to have something like this:
//here we run query to external search engine
Listbyte[] keys = performSphinxQuery(someFullTextSearchQuery);
IndexClause indexClause
Why it's radically?
It will be same get_indexes_slices search but in specified set of rows. So
mostly it will be one more Search Expression over rowIDs not only column
values. Usually the more restrictions you could specify in search query, the
faster search it can be (not slower at least).
Hi,
I am running Cassandra over Linux VMs, each VM is: 2GB RAM, 4 core CPU.
Using RPM distribution. I have set -Xmx to 512M in cassandra-env.sh
After day of running I see that Cassandra process is utilizing over 80% of
memory that is 3 times more then 512M.
In result after 2 days of running,
Thanks for reply. Now it looks much more clear.
Top shows this:
PID USER PR NI VIRT *RES* SHR
67 cassandr 18 0 6267m *1.6g * 805m S 0.3 79.0 24:35.80
java
It's Ok with huge VIRT memory since it's 64 bit architecture.
But RES is keep growing.
And I still have questions:
1) If
Looks like I have same problem as here:
https://issues.apache.org/jira/browse/CASSANDRA-2868
But, it's been fixed in 0.8.5 and I'm using 0.8.5 ...
Evgeny.
Hi,
Just now migrated to 1.0.3 and got same error.
I did folowing;
1) Create CF with compression
2) Update cf metadata on new created CF.
update failed with same Exception about Caused by: java.util.concurrent.
ExecutionException: java.io.IOException:
+1
After upgrade to 1.0.5 also have Timeout exception on Secondary Index
search (get_indexed_slices API) .
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