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From "xingang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3062) Read from kafka replication to get data likely Version based
Date Mon, 04 Jan 2016 23:22:39 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081989#comment-15081989
] 

xingang commented on KAFKA-3062:
--------------------------------

"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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