[
https://issues.apache.org/jira/browse/HADOOP-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531135
]
Doug Cutting commented on HADOOP-1965:
--------------------------------------
How much better would this do than simply running more map tasks per node at a
time? While one is spilling, another can be mapping, no? I guess this might
improve task latency a bit, but would it really help throughput much?
> Handle map output buffers better
> --------------------------------
>
> Key: HADOOP-1965
> URL: https://issues.apache.org/jira/browse/HADOOP-1965
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Amar Kamat
>
> Today, the map task stops calling the map method while sort/spill is using
> the (single instance of) map output buffer. One improvement that can be done
> to improve performance of the map task is to have another buffer for writing
> the map outputs to, while sort/spill is using the first buffer.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
