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https://issues.apache.org/jira/browse/GOBBLIN-706?focusedWorklogId=217072&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-217072
]
ASF GitHub Bot logged work on GOBBLIN-706:
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Author: ASF GitHub Bot
Created on: 21/Mar/19 23:53
Start Date: 21/Mar/19 23:53
Worklog Time Spent: 10m
Work Description: ZihanLi58 commented on pull request #2576:
[GOBBLIN-706]enable dynamic mappers
URL: https://github.com/apache/incubator-gobblin/pull/2576
Dear Gobblin maintainers,
Please accept this PR. I understand that it will not be reviewed until I
have checked off all the steps below!
### JIRA
- [ ] My PR addresses the following [Gobblin
JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references
them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
- https://issues.apache.org/jira/browse/GOBBLIN-706
### Description
- [ ] Here are some details about my PR, including screenshots (if
applicable):
Today the number of mappers is hard coded and almost always reached,
however, many mappers do very little work. This tends to cause small files and
short jobs that are overhead dominated. The improvement here is to enable user
add a job property named target.mapper.size to set the target mapper size and
Gobblin will dynamically scale the number of mappers up and down depending on
the total load. If the property is not set, the number of mappers will still be
the vale of mr.job.max.mappers.
### Tests
- [ ] My PR adds the following unit tests __OR__ does not need testing for
this extremely good reason:
### Commits
- [ ] My commits all reference JIRA issues in their subject lines, and I
have squashed multiple commits if they address the same issue. In addition, my
commits follow the guidelines from "[How to write a good git commit
message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
2. Subject is limited to 50 characters
3. Subject does not end with a period
4. Subject uses the imperative mood ("add", not "adding")
5. Body wraps at 72 characters
6. Body explains "what" and "why", not "how"
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Issue Time Tracking
-------------------
Worklog Id: (was: 217072)
Time Spent: 10m
Remaining Estimate: 0h
> Making KafkaSource dynamically determine the number of mapper
> -------------------------------------------------------------
>
> Key: GOBBLIN-706
> URL: https://issues.apache.org/jira/browse/GOBBLIN-706
> Project: Apache Gobblin
> Issue Type: Improvement
> Reporter: Lei Sun
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
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