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https://issues.apache.org/jira/browse/HADOOP-18023?focusedWorklogId=686246&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-686246
]
ASF GitHub Bot logged work on HADOOP-18023:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Nov/21 06:45
Start Date: 25/Nov/21 06:45
Worklog Time Spent: 10m
Work Description: smarthanwang opened a new pull request #3721:
URL: https://github.com/apache/hadoop/pull/3721
JIRA: https://issues.apache.org/jira/browse/HADOOP-18023
### Description of PR
Allow hadoop fs -cp command to run with multi-thread to improve copy speed.
### How was this patch tested?
It's useful to allow -cp command to run with multi-thread, like the
improvement we done for -put/-get commands. It would reduce about 90% time
cost when run with 10 threads in my test cases.
#### Source dir: 1 dir 401 files 2.3G
##### Test 1: run with single thread
```
time hadoop fs -cp /tmp/data/test /tmp/data/t1
real 1m9.394s
user 0m16.688s
sys 0m5.331s
```
##### Test 2: run with 10 threads
```
time hadoop fs -cp -t 10 /tmp/data/test /tmp/data/t2
real 0m8.217s
user 0m19.864s
sys 0m8.776s
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 686246)
Remaining Estimate: 0h
Time Spent: 10m
> Allow cp command to run with multi threads.
> -------------------------------------------
>
> Key: HADOOP-18023
> URL: https://issues.apache.org/jira/browse/HADOOP-18023
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Reporter: Chengwei Wang
> Assignee: Chengwei Wang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Allow _*hadoop fs -cp*_ command to run with multi-thread to improve copy
> speed.
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