HDFS-6486. Add user doc for XAttrs via WebHDFS. Contributed by Yi Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1605062 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uma Maheswara Rao G 2014-06-24 12:13:43 +00:00
parent 22b9a60964
commit ff41321e2f
2 changed files with 331 additions and 0 deletions

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@ -469,6 +469,8 @@ Release 2.5.0 - UNRELEASED
HDFS-6562. Refactor rename() in FSDirectory. (wheat9) HDFS-6562. Refactor rename() in FSDirectory. (wheat9)
HDFS-6486. Add user doc for XAttrs via WebHDFS. (Yi Liu via umamahesh)
OPTIMIZATIONS OPTIMIZATIONS
HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn) HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

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@ -70,6 +70,18 @@ WebHDFS REST API
* {{{Get Delegation Tokens}<<<GETDELEGATIONTOKENS>>>}} * {{{Get Delegation Tokens}<<<GETDELEGATIONTOKENS>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getDelegationTokens) (see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getDelegationTokens)
* {{{Get an XAttr}<<<GETXATTRS>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttr)
* {{{Get multiple XAttrs}<<<GETXATTRS>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttrs)
* {{{Get all XAttrs}<<<GETXATTRS>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttrs)
* {{{List all XAttrs}<<<LISTXATTRS>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.listXAttrs)
* HTTP PUT * HTTP PUT
* {{{Create and Write to a File}<<<CREATE>>>}} * {{{Create and Write to a File}<<<CREATE>>>}}
@ -108,6 +120,12 @@ WebHDFS REST API
* {{{Rename Snapshot}<<<RENAMESNAPSHOT>>>}} * {{{Rename Snapshot}<<<RENAMESNAPSHOT>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.renameSnapshot) (see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.renameSnapshot)
* {{{Set XAttr}<<<SETXATTR>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.setXAttr)
* {{{Remove XAttr}<<<REMOVEXATTR>>>}}
(see {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.removeXAttr)
* HTTP POST * HTTP POST
* {{{Append to a File}<<<APPEND>>>}} * {{{Append to a File}<<<APPEND>>>}}
@ -909,6 +927,188 @@ Transfer-Encoding: chunked
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getAclStatus {{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getAclStatus
* {Extended Attributes(XAttrs) Operations}
** {Set XAttr}
* Submit a HTTP PUT request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=op=SETXATTR
&xattr.name=<XATTRNAME>&xattr.value=<XATTRVALUE>
&flag=<FLAG>"
+---------------------------------
The client receives a response with zero content length:
+---------------------------------
HTTP/1.1 200 OK
Content-Length: 0
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.setXAttr
** {Remove XAttr}
* Submit a HTTP PUT request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=REMOVEXATTR
&xattr.name=<XATTRNAME>"
+---------------------------------
The client receives a response with zero content length:
+---------------------------------
HTTP/1.1 200 OK
Content-Length: 0
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.removeXAttr
** {Get an XAttr}
* Submit a HTTP GET request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETXATTRS
&xattr.name=<XATTRNAME>&encoding=<ENCODING>"
+---------------------------------
The client receives a response with a {{{XAttrs JSON Schema}<<<XAttrs>>> JSON object}}:
+---------------------------------
HTTP/1.1 200 OK
Content-Type: application/json
Transfer-Encoding: chunked
{
"XAttrs": [
{
"name":"XATTRNAME",
"value":"XATTRVALUE"
}
]
}
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttr
** {Get multiple XAttrs}
* Submit a HTTP GET request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETXATTRS
&xattr.name=<XATTRNAME1>&xattr.name=<XATTRNAME2>
&encoding=<ENCODING>"
+---------------------------------
The client receives a response with a {{{XAttrs JSON Schema}<<<XAttrs>>> JSON object}}:
+---------------------------------
HTTP/1.1 200 OK
Content-Type: application/json
Transfer-Encoding: chunked
{
"XAttrs": [
{
"name":"XATTRNAME1",
"value":"XATTRVALUE1"
},
{
"name":"XATTRNAME2",
"value":"XATTRVALUE2"
}
]
}
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttrs
** {Get all XAttrs}
* Submit a HTTP GET request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETXATTRS
&encoding=<ENCODING>"
+---------------------------------
The client receives a response with a {{{XAttrs JSON Schema}<<<XAttrs>>> JSON object}}:
+---------------------------------
HTTP/1.1 200 OK
Content-Type: application/json
Transfer-Encoding: chunked
{
"XAttrs": [
{
"name":"XATTRNAME1",
"value":"XATTRVALUE1"
},
{
"name":"XATTRNAME2",
"value":"XATTRVALUE2"
},
{
"name":"XATTRNAME3",
"value":"XATTRVALUE3"
}
]
}
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.getXAttrs
** {List all XAttrs}
* Submit a HTTP GET request.
+---------------------------------
curl -i -X PUT "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=LISTXATTRS"
+---------------------------------
The client receives a response with a {{{XAttrNames JSON Schema}<<<XAttrNames>>> JSON object}}:
+---------------------------------
HTTP/1.1 200 OK
Content-Type: application/json
Transfer-Encoding: chunked
{
"XAttrNames":"[\"XATTRNAME1\",\"XATTRNAME2\",\"XATTRNAME3\"]"
}
+---------------------------------
[]
See also:
{{{../../api/org/apache/hadoop/fs/FileSystem.html}FileSystem}}.listXAttrs
* {Snapshot Operations} * {Snapshot Operations}
** {Create Snapshot} ** {Create Snapshot}
@ -1252,6 +1452,58 @@ Transfer-Encoding: chunked
+--------------------------------- +---------------------------------
** {XAttrs JSON Schema}
+---------------------------------
{
"name" : "XAttrs",
"properties":
{
"XAttrs":
{
"type" : "array",
"items":
{
"type" " "object",
"properties":
{
"name":
{
"description": "XAttr name.",
"type" : "string",
"required" : true
},
"value":
{
"description": "XAttr value.",
"type" : "string"
}
}
}
}
}
}
+---------------------------------
** {XAttrNames JSON Schema}
+---------------------------------
{
"name" : "XAttrNames",
"properties":
{
"XAttrNames":
{
"description": "XAttr names.",
"type" : "string"
"required" : true
}
}
}
+---------------------------------
** {Boolean JSON Schema} ** {Boolean JSON Schema}
+--------------------------------- +---------------------------------
@ -1688,6 +1940,83 @@ var tokenProperties =
*----------------+-------------------------------------------------------------------+ *----------------+-------------------------------------------------------------------+
** {XAttr Name}
*----------------+-------------------------------------------------------------------+
|| Name | <<<xattr.name>>> |
*----------------+-------------------------------------------------------------------+
|| Description | The XAttr name of a file/directory. |
*----------------+-------------------------------------------------------------------+
|| Type | String |
*----------------+-------------------------------------------------------------------+
|| Default Value | \<empty\> |
*----------------+-------------------------------------------------------------------+
|| Valid Values | Any string prefixed with user./trusted./system./security.. |
*----------------+-------------------------------------------------------------------+
|| Syntax | Any string prefixed with user./trusted./system./security.. |
*----------------+-------------------------------------------------------------------+
** {XAttr Value}
*----------------+-------------------------------------------------------------------+
|| Name | <<<xattr.value>>> |
*----------------+-------------------------------------------------------------------+
|| Description | The XAttr value of a file/directory. |
*----------------+-------------------------------------------------------------------+
|| Type | String |
*----------------+-------------------------------------------------------------------+
|| Default Value | \<empty\> |
*----------------+-------------------------------------------------------------------+
|| Valid Values | An encoded value. |
*----------------+-------------------------------------------------------------------+
|| Syntax | Enclosed in double quotes or prefixed with 0x or 0s. |
*----------------+-------------------------------------------------------------------+
See also:
{{{./ExtendedAttributes.html}Extended Attributes}}
** {XAttr set flag}
*----------------+-------------------------------------------------------------------+
|| Name | <<<flag>>> |
*----------------+-------------------------------------------------------------------+
|| Description | The XAttr set flag. |
*----------------+-------------------------------------------------------------------+
|| Type | String |
*----------------+-------------------------------------------------------------------+
|| Default Value | \<empty\> |
*----------------+-------------------------------------------------------------------+
|| Valid Values | CREATE,REPLACE. |
*----------------+-------------------------------------------------------------------+
|| Syntax | CREATE,REPLACE. |
*----------------+-------------------------------------------------------------------+
See also:
{{{./ExtendedAttributes.html}Extended Attributes}}
** {XAttr value encoding}
*----------------+-------------------------------------------------------------------+
|| Name | <<<encoding>>> |
*----------------+-------------------------------------------------------------------+
|| Description | The XAttr value encoding. |
*----------------+-------------------------------------------------------------------+
|| Type | String |
*----------------+-------------------------------------------------------------------+
|| Default Value | \<empty\> |
*----------------+-------------------------------------------------------------------+
|| Valid Values | text \| hex \| base64 |
*----------------+-------------------------------------------------------------------+
|| Syntax | text \| hex \| base64 |
*----------------+-------------------------------------------------------------------+
See also:
{{{./ExtendedAttributes.html}Extended Attributes}}
** {Access Time} ** {Access Time}
*----------------+-------------------------------------------------------------------+ *----------------+-------------------------------------------------------------------+