thrift API

Hi, can anyone explain why APIs include multiget, batch_insert,get_range_slice are removed in Version above 7.0?

Re:Key_Cache @ Row_Cache

row_Cache caches a whole row, Key_cache caches the key and the row location. thus, if the request is hit in row_Cache then the result can be given without disk seek. If it is hit in key_Cache, result can be obtains after one disk seek. without key_Cache or row_cache, it will check the index file f

insert a super column

insert(key, column_path, column, consistency_level) can only insert a standard column. Is batch_mutate the only API to insert a super column? and also can someone tell why batch_insert,multi_get is removed in version 0.7.4?

reset keys_cached

Can any one tell how to reset "keys_cached"? Thanks.

host clocks

hi all, I'm launching a cassandra cluster with 30 nodes. I wonder whether the inconsistency of host clocks will influence the performance of cluster. Thanks!

can one keyspace has two groups of "initial_token"?

My question is whether two groups of "initial_token" can coexist since our goal is to partition data of each column family uniformly on 5 nodes. I deployed Cassandra 0.7.4 on a cluster of 5 nodes, using orderPreservingPartitioner. Two column families named CF1 and CF2 are created on one keyspa

Re:Re: can one keyspace has two groups of "initial_token"?

Cassandra. 2011/12/17 魏金仙 My question is whether two groups of "initial_token" can coexist since our goal is to partition data of each column family uniformly on 5 nodes. I deployed Cassandra 0.7.4 on a cluster of 5 nodes, using orderPreservingPartitioner. Two column families n

index file and KeysCached

for each sstable, there is an index file, which is loaded in memory to locate a particular key's offset efficiently. and for each CF, KeysCached can be set to cache keys' location. could you pls tell me the difference between the two? I'm wondering whether it's necessary to set "KeysCached" for a

probability of node receiving (not be responsible for) the request

If a particular client send 5 requests to a 6-node cluster, then the probability of each node receiving(not be responsible for) the first request is 1/6. Assume that node1 received the 1st request, will node1 receive the 2nd request, the 3rd one, the 4th one and the 5th one with high probabili

Re:Re: probability of node receiving (not be responsible for) the request

thank you. but I mean the probability of a node to receive the request not process it eventually . At 2010-12-06 00:56:58，"Brandon Williams" wrote: 2010/12/5 魏金仙 If a particular client send 5 requests to a 6-node cluster, then the probability of each node receiving(not be respo

Re:Re: index file and KeysCached

so when will index files be in the memory? At 2010-12-06 00:54:48，"Brandon Williams" wrote: 2010/12/5 魏金仙 for each sstable, there is an index file, which is loaded in memory to locate a particular key's offset efficiently. Index files are not held in memory. and for each

the problem of elasticity

I've no idea why it doesn't work well. We are testing Elasticity of Cassandra 0.6.6.We choose orderPreservingPartitioner and set replicationFactor as 2. We start from 6-server cluster(node A, B,C,D,E,F), which is load balanced. roughly every node has 12GB. we then add node G between A and B. the

question about performance of Cassandra 0.7.4 under a read-heavy workload.

I just deployed cassandra 0.7.4 as a 6-server cluster and tested its performance via YCSB. The result seems confusing when compared to that of Cassandra0.6.6. Under a write heavy workload(i.e., write/read: 50%/50%), Cassandra0.7.4 obtains a really satisfactory latency. I mean both the read laten

Re:Re: question about performance of Cassandra 0.7.4 under a read-heavy workload.

number of requests, iostats etc. There is no reason for it to run slower. Aaron On 16/04/2011, at 2:35 AM, 魏金仙 wrote: I just deployed cassandra 0.7.4 as a 6-server cluster and tested its performance via YCSB. The result seems confusing when compared to that of Cassandra0.6.6. Under a w

data size

When I load 17GB(as nodetool ring shows) data to a Cassandra node which is clean before data loading, all the files in the data directory can have a size larger than 100GB. Is it normal?