[jira] [Updated] (KAFKA-3438) Rack Aware Replica Reassignment should warn of overloaded brokers
[ https://issues.apache.org/jira/browse/KAFKA-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Vahid Hashemian updated KAFKA-3438: --- Fix Version/s: (was: 0.10.1.0) Status: Patch Available (was: Open) > Rack Aware Replica Reassignment should warn of overloaded brokers > - > > Key: KAFKA-3438 > URL: https://issues.apache.org/jira/browse/KAFKA-3438 > Project: Kafka > Issue Type: Improvement >Affects Versions: 0.10.0.0 >Reporter: Ben Stopford >Assignee: Vahid Hashemian > > We've changed the replica reassignment code to be rack aware. > One problem that might catch users out would be that they rebalance the > cluster using kafka-reassign-partitions.sh but their rack configuration means > that some high proportion of replicas are pushed onto a single, or small > number of, brokers. > This should be an easy problem to avoid, by changing the rack assignment > information, but we should probably warn users if they are going to create > something that is unbalanced. > So imagine I have a Kafka cluster of 12 nodes spread over two racks with rack > awareness enabled. If I add a 13th machine, on a new rack, and run the > rebalance tool, that new machine will get ~6x as many replicas as the least > loaded broker. > Suggest a warning be added to the tool output when --generate is called. > "The most loaded broker has 2.3x as many replicas as the the least loaded > broker. This is likely due to an uneven distribution of brokers across racks. > You're advised to alter the rack config so there are approximately the same > number of brokers per rack" and displays the individual rack→#brokers and > broker→#replicas data for the proposed move. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-3438) Rack Aware Replica Reassignment should warn of overloaded brokers
[ https://issues.apache.org/jira/browse/KAFKA-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Ismael Juma updated KAFKA-3438: --- Fix Version/s: (was: 0.10.0.1) 0.10.1.0 > Rack Aware Replica Reassignment should warn of overloaded brokers > - > > Key: KAFKA-3438 > URL: https://issues.apache.org/jira/browse/KAFKA-3438 > Project: Kafka > Issue Type: Improvement >Affects Versions: 0.10.0.0 >Reporter: Ben Stopford > Fix For: 0.10.1.0 > > > We've changed the replica reassignment code to be rack aware. > One problem that might catch users out would be that they rebalance the > cluster using kafka-reassign-partitions.sh but their rack configuration means > that some high proportion of replicas are pushed onto a single, or small > number of, brokers. > This should be an easy problem to avoid, by changing the rack assignment > information, but we should probably warn users if they are going to create > something that is unbalanced. > So imagine I have a Kafka cluster of 12 nodes spread over two racks with rack > awareness enabled. If I add a 13th machine, on a new rack, and run the > rebalance tool, that new machine will get ~6x as many replicas as the least > loaded broker. > Suggest a warning be added to the tool output when --generate is called. > "The most loaded broker has 2.3x as many replicas as the the least loaded > broker. This is likely due to an uneven distribution of brokers across racks. > You're advised to alter the rack config so there are approximately the same > number of brokers per rack" and displays the individual rack→#brokers and > broker→#replicas data for the proposed move. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-3438) Rack Aware Replica Reassignment should warn of overloaded brokers
[ https://issues.apache.org/jira/browse/KAFKA-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Grant Henke updated KAFKA-3438: --- Fix Version/s: 0.10.0.1 > Rack Aware Replica Reassignment should warn of overloaded brokers > - > > Key: KAFKA-3438 > URL: https://issues.apache.org/jira/browse/KAFKA-3438 > Project: Kafka > Issue Type: Improvement >Affects Versions: 0.10.0.0 >Reporter: Ben Stopford > Fix For: 0.10.0.1 > > > We've changed the replica reassignment code to be rack aware. > One problem that might catch users out would be that they rebalance the > cluster using kafka-reassign-partitions.sh but their rack configuration means > that some high proportion of replicas are pushed onto a single, or small > number of, brokers. > This should be an easy problem to avoid, by changing the rack assignment > information, but we should probably warn users if they are going to create > something that is unbalanced. > So imagine I have a Kafka cluster of 12 nodes spread over two racks with rack > awareness enabled. If I add a 13th machine, on a new rack, and run the > rebalance tool, that new machine will get ~6x as many replicas as the least > loaded broker. > Suggest a warning be added to the tool output when --generate is called. > "The most loaded broker has 2.3x as many replicas as the the least loaded > broker. This is likely due to an uneven distribution of brokers across racks. > You're advised to alter the rack config so there are approximately the same > number of brokers per rack" and displays the individual rack→#brokers and > broker→#replicas data for the proposed move. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Updated] (KAFKA-3438) Rack Aware Replica Reassignment should warn of overloaded brokers
[ https://issues.apache.org/jira/browse/KAFKA-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Grant Henke updated KAFKA-3438: --- Affects Version/s: 0.10.0.0 > Rack Aware Replica Reassignment should warn of overloaded brokers > - > > Key: KAFKA-3438 > URL: https://issues.apache.org/jira/browse/KAFKA-3438 > Project: Kafka > Issue Type: Improvement >Affects Versions: 0.10.0.0 >Reporter: Ben Stopford > Fix For: 0.10.0.1 > > > We've changed the replica reassignment code to be rack aware. > One problem that might catch users out would be that they rebalance the > cluster using kafka-reassign-partitions.sh but their rack configuration means > that some high proportion of replicas are pushed onto a single, or small > number of, brokers. > This should be an easy problem to avoid, by changing the rack assignment > information, but we should probably warn users if they are going to create > something that is unbalanced. > So imagine I have a Kafka cluster of 12 nodes spread over two racks with rack > awareness enabled. If I add a 13th machine, on a new rack, and run the > rebalance tool, that new machine will get ~6x as many replicas as the least > loaded broker. > Suggest a warning be added to the tool output when --generate is called. > "The most loaded broker has 2.3x as many replicas as the the least loaded > broker. This is likely due to an uneven distribution of brokers across racks. > You're advised to alter the rack config so there are approximately the same > number of brokers per rack" and displays the individual rack→#brokers and > broker→#replicas data for the proposed move. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
