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https://issues.apache.org/jira/browse/KAFKA-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081989#comment-15081989
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xingang edited comment on KAFKA-3062 at 1/4/16 11:45 PM:
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"Likely version based" means:

1) it's Ok for such None-Latency sensitive consumers to fetch data slower than 
from the leaders. or even less of them
2) the consistency of replicas could be version-based synced, thus, the 
consumers can get the "None-dup, None-loss" eventually, No requirement to be 
consistent for a real-time

It will be so GOOD in this way, No more extra storage required but get 
History/Realtime consuming separated


was (Author: itismewxg):
"Likely version based" means:

1) it's Ok for such None-Latency consumers to fetch data slower than from the 
leaders. or even less of them
2) the consistency of replicas could be version-based synced, thus, the 
consumers can get the "None-dup, None-loss" eventually, No requirement to be 
consistent for a real-time

It will be so GOOD in this way, No more extra storage required but get 
History/Realtime consuming separated

> Read from kafka replication to get data likely Version based
> ------------------------------------------------------------
>
>                 Key: KAFKA-3062
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3062
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: xingang
>
> Since Kafka require all the reading happens in the leader for the consistency.
> If there could be possible for the reading can happens in replication, thus, 
> for data have a number of consumers, for the consumers Not latency-sensitive 
> But Data-Loss sensitive can fetch its data from replication, in this case, it 
> will pollute the Pagecache for other consumers which are latency-sensitive



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