From: Kirk True k...@mustardgrain.com
To: user@cassandra.apache.org
Sent: Monday, November 12, 2012 4:24 PM
Subject: Re: read request distribution
Somewhat recently the Ownership column was changed to Effective Ownership.
Previously the formula was essentially 100/nodes. Now
12, 2012 4:24 PM
Subject: Re: read request distribution
Somewhat recently the Ownership column was changed to Effective Ownership.
Previously the formula was essentially 100/nodes. Now it's 100*replication
factor/nodes. So in previous releases of Cassandra it would be 100/12 =
8.33
given the fact it's in charge of the
wider columns than the other two.
Thanks.
-Wei
From: Tyler Hobbs ty...@datastax.com
To: user@cassandra.apache.org; Wei Zhu wz1...@yahoo.com
Sent: Saturday, November 10, 2012 3:15 PM
Subject: Re: read request distribution
...@datastax.com
*To:* user@cassandra.apache.org; Wei Zhu wz1...@yahoo.com
*Sent:* Saturday, November 10, 2012 3:15 PM
*Subject:* Re: read request distribution
When you read at quorum, a normal read query will be sent to one replica
(possibly the same node that's coordinating) and a digest query
two?
Thanks for the explanation of QUORUM, it clears a lot of confusion.
-Wei
From: Tyler Hobbs ty...@datastax.com
To: user@cassandra.apache.org; Wei Zhu wz1...@yahoo.com
Sent: Monday, November 12, 2012 12:43 PM
Subject: Re: read request distribution
Hi all,
On an unrelated observation of the below readings, it looks like all the 3
nodes own 100% of the data. This confuses me a bit. We have a 12 node
cluster with RF=3 but the effective ownership is shown as 8.33 % .
So here is my question. How is the ownership calculated : Is Replica factor
Somewhat recently the Ownership column was changed to Effective
Ownership.
Previously the formula was essentially 100/nodes. Now it's
100*replication factor/nodes. So in previous releases of Cassandra
it would be 100/12 = 8.33, now it would be closer to 25% (8.33*3
(assuming a replication
--
*From:* Wei Zhu wz1...@yahoo.com
*To:* Cassandr usergroup user@cassandra.apache.org
*Sent:* Thursday, November 8, 2012 9:37 PM
*Subject:* read request distribution
Hi All,
I am doing a benchmark on a Cassandra. I have a three node cluster with
RF=3. I generated 6M rows
Sent: Thursday, November 8, 2012 9:37 PM
Subject: read request distribution
Hi All,
I am doing a benchmark on a Cassandra. I have a three node cluster with RF=3. I
generated 6M rows with sequence number from 1 to 6m, so the rows should be
evenly distributed among the three nodes disregarding
Hi All,
I am doing a benchmark on a Cassandra. I have a three node cluster with RF=3. I
generated 6M rows with sequence number from 1 to 6m, so the rows should be
evenly distributed among the three nodes disregarding the replicates.
I am doing a benchmark with read only requests, I generate
10 matches
Mail list logo
