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https://issues.apache.org/jira/browse/HADOOP-17021?focusedWorklogId=486140&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-486140
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ASF GitHub Bot logged work on HADOOP-17021:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 18/Sep/20 09:31
Start Date: 18/Sep/20 09:31
Worklog Time Spent: 10m
Work Description: wojiaodoubao commented on a change in pull request
#1993:
URL: https://github.com/apache/hadoop/pull/1993#discussion_r490822258
##########
File path:
hadoop-common-project/hadoop-common/src/site/markdown/FileSystemShell.md
##########
@@ -824,6 +824,19 @@ Example:
* `hadoop fs -truncate 55 /user/hadoop/file1 /user/hadoop/file2`
* `hadoop fs -truncate -w 127 hdfs://nn1.example.com/user/hadoop/file1`
+concat
+--------
+
+Usage: `hadoop fs -concat <target file> <source files>`
+
+Concatenate existing source files into the target file. Target file and source
+files should be in the same directory.
+
+Example:
+
+* `hadoop fs -concat /user/hadoop/target-file /user/hadoop/file-0
/user/hadoop/file-1`
+* `hadoop fs -concat /user/hadoop/target-file /user/hadoop/file-*`
Review comment:
I didn't understand with the expansion locally part. I think the
expansion would be done by org.apache.hadoop.fs.shell.Command so even not using
'bash' the expansion would still work correctly? Sorry if I understand it
wrong. A more detailed explanation would be very helpful.
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Issue Time Tracking
-------------------
Worklog Id: (was: 486140)
Time Spent: 1h 20m (was: 1h 10m)
> Add concat fs command
> ---------------------
>
> Key: HADOOP-17021
> URL: https://issues.apache.org/jira/browse/HADOOP-17021
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Minor
> Labels: pull-request-available
> Attachments: HADOOP-17021.001.patch
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> We should add one concat fs command for ease of use. It concatenates existing
> source files into the target file using FileSystem.concat().
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