Throughput Vs Latency
Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay
RE: Throughput Vs Latency
Hi, First of all,the write latency of cassandra is not high(Read is high). The high throughput is achieved through distributes read and write. Your doubt ( If Latency is more how come the Throughput is high ) is some what right if you put high consistency to both read and write. You will get distributed abilities since it is not Master/Slave architecture(Like HBase). If your consistency is lesser,then some nodes out of all replica nodes are free and will be used for another read/write . [ Think you are using multithreaded application ] Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 10:46 AM To: user@cassandra.apache.org Subject: Throughput Vs Latency Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay
Re: Throughput Vs Latency
Thanks Thomas for the clarification. If I use the Consistency level of QUORUM for Read and Write, the Latency would affect the Throughput right? Thanks Ajay On Fri, Dec 26, 2014 at 11:15 AM, Job Thomas j...@suntecgroup.com wrote: Hi, First of all,the write latency of cassandra is not high(Read is high). The high throughput is achieved through distributes read and write. Your doubt ( If Latency is more how come the Throughput is high ) is some what right if you put high consistency to both read and write. You will get distributed abilities since it is not Master/Slave architecture(Like HBase). If your consistency is lesser,then some nodes out of all replica nodes are free and will be used for another read/write . [ Think you are using multithreaded application ] Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 -- *From:* Ajay [mailto:ajay.ga...@gmail.com] *Sent:* Fri 12/26/2014 10:46 AM *To:* user@cassandra.apache.org *Subject:* Throughput Vs Latency Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay
RE: Throughput Vs Latency
Hi Ajay, My understanding is this,If you have a cluster of 3 nodes with replication factor of 3 , then the latency has more roll in throughput. It the cluster size is 6 with replication factor or 3 and if you are using multithreaded client, then the latency remain same and you will get better throughput.(Not because of 6 node but because of 6 nodes and multiple threads). Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 11:57 AM To: user@cassandra.apache.org Subject: Re: Throughput Vs Latency Thanks Thomas for the clarification. If I use the Consistency level of QUORUM for Read and Write, the Latency would affect the Throughput right? Thanks Ajay On Fri, Dec 26, 2014 at 11:15 AM, Job Thomas j...@suntecgroup.com wrote: Hi, First of all,the write latency of cassandra is not high(Read is high). The high throughput is achieved through distributes read and write. Your doubt ( If Latency is more how come the Throughput is high ) is some what right if you put high consistency to both read and write. You will get distributed abilities since it is not Master/Slave architecture(Like HBase). If your consistency is lesser,then some nodes out of all replica nodes are free and will be used for another read/write . [ Think you are using multithreaded application ] Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 10:46 AM To: user@cassandra.apache.org Subject: Throughput Vs Latency Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay winmail.dat
Re: Throughput Vs Latency
Hi Thomas, I am little confused when you say multithreaded client. Actually we don't explicitly invoke read on multiple servers (for replicated data) from the client code. So how does multithreaded client fix this? Thanks Ajay On Fri, Dec 26, 2014 at 12:08 PM, Job Thomas j...@suntecgroup.com wrote: Hi Ajay, My understanding is this,If you have a cluster of 3 nodes with replication factor of 3 , then the latency has more roll in throughput. It the cluster size is 6 with replication factor or 3 and if you are using multithreaded client, then the latency remain same and you will get better throughput.(Not because of 6 node but because of 6 nodes and multiple threads). Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 11:57 AM To: user@cassandra.apache.org Subject: Re: Throughput Vs Latency Thanks Thomas for the clarification. If I use the Consistency level of QUORUM for Read and Write, the Latency would affect the Throughput right? Thanks Ajay On Fri, Dec 26, 2014 at 11:15 AM, Job Thomas j...@suntecgroup.com wrote: Hi, First of all,the write latency of cassandra is not high(Read is high). The high throughput is achieved through distributes read and write. Your doubt ( If Latency is more how come the Throughput is high ) is some what right if you put high consistency to both read and write. You will get distributed abilities since it is not Master/Slave architecture(Like HBase). If your consistency is lesser,then some nodes out of all replica nodes are free and will be used for another read/write . [ Think you are using multithreaded application ] Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 10:46 AM To: user@cassandra.apache.org Subject: Throughput Vs Latency Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay
RE: Throughput Vs Latency
Even if you are connecting the client to one running node, it will just act as co-coordinator , the read write/read will ends in the actual node where the data exists. Bu multithread, I mean non serialized read/write (read or write , one after another). If this is the case then surely ur equation is right. ( throughput is proportional to latency) Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 12:52 PM To: user@cassandra.apache.org Subject: Re: Throughput Vs Latency Hi Thomas, I am little confused when you say multithreaded client. Actually we don't explicitly invoke read on multiple servers (for replicated data) from the client code. So how does multithreaded client fix this? Thanks Ajay On Fri, Dec 26, 2014 at 12:08 PM, Job Thomas j...@suntecgroup.com wrote: Hi Ajay, My understanding is this,If you have a cluster of 3 nodes with replication factor of 3 , then the latency has more roll in throughput. It the cluster size is 6 with replication factor or 3 and if you are using multithreaded client, then the latency remain same and you will get better throughput.(Not because of 6 node but because of 6 nodes and multiple threads). Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 11:57 AM To: user@cassandra.apache.org Subject: Re: Throughput Vs Latency Thanks Thomas for the clarification. If I use the Consistency level of QUORUM for Read and Write, the Latency would affect the Throughput right? Thanks Ajay On Fri, Dec 26, 2014 at 11:15 AM, Job Thomas j...@suntecgroup.com wrote: Hi, First of all,the write latency of cassandra is not high(Read is high). The high throughput is achieved through distributes read and write. Your doubt ( If Latency is more how come the Throughput is high ) is some what right if you put high consistency to both read and write. You will get distributed abilities since it is not Master/Slave architecture(Like HBase). If your consistency is lesser,then some nodes out of all replica nodes are free and will be used for another read/write . [ Think you are using multithreaded application ] Thanks Regards Job M Thomas Platform Technology Mob : 7560885748 From: Ajay [mailto:ajay.ga...@gmail.com] Sent: Fri 12/26/2014 10:46 AM To: user@cassandra.apache.org Subject: Throughput Vs Latency Hi, I am new to No SQL (and Cassandra). As I am going through few articles on Cassandra, it says Cassandra achieves highest throughput among various No SQL solutions but at the cost of high read and write latency. I have a basic question here - (If my understanding is right) Latency means the time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay winmail.dat
