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HDFS-12833. Distcp : Update the usage of delete option for dependency with update and overwrite option. Contributed by usharani.

This commit is contained in:
Surendra Singh Lilhore 2017-12-12 00:28:02 +05:30
parent 312ceebde8
commit 00129c5314
2 changed files with 2 additions and 2 deletions
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2
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptionSwitch.java
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@ -73,7 +73,7 @@ public enum DistCpOptionSwitch {
*/
DELETE_MISSING(DistCpConstants.CONF_LABEL_DELETE_MISSING,
new Option("delete", false, "Delete from target, " +
"files missing in source")),
"files missing in source. Delete is applicable only with update or overwrite options")),
/**
* Number of threads for building source file listing (before map-reduce
* phase, max one listStatus per thread at a time).

2
hadoop-tools/hadoop-distcp/src/site/markdown/DistCp.md.vm
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@ -229,7 +229,7 @@ Flag | Description | Notes
`-filters` | The path to a file containing a list of pattern strings, one string per line, such that paths matching the pattern will be excluded from the copy. | Support regular expressions specified by java.util.regex.Pattern.
`-filelimit <n>` | Limit the total number of files to be <= n | **Deprecated!** Ignored in the new DistCp.
`-sizelimit <n>` | Limit the total size to be <= n bytes | **Deprecated!** Ignored in the new DistCp.
`-delete` | Delete the files existing in the dst but not in src | The deletion is done by FS Shell. So the trash will be used, if it is enable.
`-delete` | Delete the files existing in the dst but not in src | The deletion is done by FS Shell. So the trash will be used, if it is enable. Delete is applicable only with update or overwrite options.
`-strategy {dynamic|uniformsize}` | Choose the copy-strategy to be used in DistCp. | By default, uniformsize is used. (i.e. Maps are balanced on the total size of files copied by each map. Similar to legacy.) If "dynamic" is specified, `DynamicInputFormat` is used instead. (This is described in the Architecture section, under InputFormats.)
`-bandwidth` | Specify bandwidth per map, in MB/second. | Each map will be restricted to consume only the specified bandwidth. This is not always exact. The map throttles back its bandwidth consumption during a copy, such that the **net** bandwidth used tends towards the specified value.
`-atomic {-tmp <tmp_dir>}` | Specify atomic commit, with optional tmp directory. | `-atomic` instructs DistCp to copy the source data to a temporary target location, and then move the temporary target to the final-location atomically. Data will either be available at final target in a complete and consistent form, or not at all. Optionally, `-tmp` may be used to specify the location of the tmp-target. If not specified, a default is chosen. **Note:** tmp_dir must be on the final target cluster.