[
https://issues.apache.org/jira/browse/HBASE-19226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248785#comment-16248785
]
Reid Chan commented on HBASE-19226:
-----------------------------------
Got it, thanks for your explanation [~Yun Zhao]
What about supports not only ratio but also a specified number(int) > 1, like 5
reducers wanted, i'd prefer a 5 rather than 0.005 if hbase has 1000 regions or
more which always happens in production.
> Limit the reduce tasks number of incremental load
> -------------------------------------------------
>
> Key: HBASE-19226
> URL: https://issues.apache.org/jira/browse/HBASE-19226
> Project: HBase
> Issue Type: Improvement
> Reporter: Yun Zhao
> Assignee: Yun Zhao
> Priority: Minor
> Attachments: HBASE-19226.master.001.patch,
> HBASE-19226.master.002.patch
>
>
> When using MapReduce job to perform an incremental load into a table,the
> number of reduce tasks is the current number of regions. If there are too
> many regions, will lead to network+disk I/O is too large, affecting the
> real-time request.
> Need to use a configuration to set a number or ratio?
> Limit running reduce tasks since
> [https://issues.apache.org/jira/browse/MAPREDUCE-5583], the old version can
> only be set reduce number.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
