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https://issues.apache.org/jira/browse/KAFKA-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xingang updated KAFKA-3062:
---------------------------
Description:
Since Kafka require all the reading happen in the leader for the consistency.
in case, for large volume data of a Topic have a number of consumers, among
them, some consumers are Not latency-sensitive But Data-Loss sensitive have a
consuming lag, then, it will pollute the Page cache as they are reading from
the disk, hence, for other consumers which are latency-sensitive will be sad
due to the pagecache miss
If there could be possible for the reading can happen in replicas for a
eventually consistent (likely version based), thus, consumers marked as "read
from replica" can be separated from others
was:
Since Kafka require all the reading happen in the leader for the consistency.
If there could be possible for the reading can happen in replicas for a
eventually consistent, thus, for data of a Topic have a number of consumers,
among them, some consumers are Not latency-sensitive But Data-Loss sensitive
can fetch its data from replicas, in this case, it will pollute the Pagecache
for other consumers which are latency-sensitive
> 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 happen in the leader for the consistency.
> in case, for large volume data of a Topic have a number of consumers, among
> them, some consumers are Not latency-sensitive But Data-Loss sensitive have a
> consuming lag, then, it will pollute the Page cache as they are reading from
> the disk, hence, for other consumers which are latency-sensitive will be sad
> due to the pagecache miss
> If there could be possible for the reading can happen in replicas for a
> eventually consistent (likely version based), thus, consumers marked as "read
> from replica" can be separated from others
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