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new e952604 HDFS-16354. Add description of GETSNAPSHOTDIFFLISTING to
WebHDFS doc. (#3740)
e952604 is described below
commit e9526042a2eebb758acf643b02a53b4f2483a2dd
Author: Masatake Iwasaki <iwasak...@apache.org>
AuthorDate: Tue Dec 7 21:39:04 2021 +0900
HDFS-16354. Add description of GETSNAPSHOTDIFFLISTING to WebHDFS doc.
(#3740)
---
.../hadoop-hdfs/src/site/markdown/WebHDFS.md | 125 +++++++++++++++++++++
1 file changed, 125 insertions(+)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
index 3fb68d4..bb4ee39 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
@@ -52,6 +52,7 @@ The HTTP REST API supports the complete
[FileSystem](../../api/org/apache/hadoop
* [`GETALLSTORAGEPOLICY`](#Get_all_Storage_Policies) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getAllStoragePolicies)
* [`GETSTORAGEPOLICY`](#Get_Storage_Policy) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getStoragePolicy)
* [`GETSNAPSHOTDIFF`](#Get_Snapshot_Diff)
+ * [`GETSNAPSHOTDIFFLISTING`](#Get_Snapshot_Diff_Iteratively)
* [`GETSNAPSHOTTABLEDIRECTORYLIST`](#Get_Snapshottable_Directory_List)
* [`GETSNAPSHOTLIST`](#Get_Snapshot_List)
* [`GETFILEBLOCKLOCATIONS`](#Get_File_Block_Locations) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getFileBlockLocations)
@@ -1604,6 +1605,27 @@ See also:
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).renameSna
{"SnapshotDiffReport":{"diffList":[],"fromSnapshot":"s3","snapshotRoot":"/foo","toSnapshot":"s4"}}
+### Get Snapshot Diff Iteratively
+
+* Submit a HTTP GET request.
+
+ curl -i -X GET
"http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETSNAPSHOTDIFFLISTING
+
&oldsnapshotname=<SNAPSHOTNAME>&snapshotname=<SNAPSHOTNAME>&snapshotdiffstartpath=<STARTPATH>&snapshotdiffindex=<STARTINDEX>
+
+ If `snapshotdiffstartpath` and `snapshotdiffindex` are not given,
+ `""` (empty string) and `-1` are used respectively implying the first
iteration.
+
+ The client receives a response with a
+ [`SnapshotDiffReportListing` JSON
object](#SnapshotDiffReportListing_JSON_Schema).
+ The value of `lastPath` and `lastIndex` must be specified as
+ the value of `snapshotdiffstartpath` and `snapshotdiffindex` respectively
on next iteration.
+
+ HTTP/1.1 200 OK
+ Content-Type: application/json
+ Transfer-Encoding: chunked
+
+
{"SnapshotDiffReportListing":{"createList":[],"deleteList":[],"isFromEarlier":true,"lastIndex":-1,"lastPath":"","modifyList":[]}}
+
### Get Snapshottable Directory List
* Submit a HTTP GET request.
@@ -2665,6 +2687,109 @@ var diffReportEntries =
}
```
+### SnapshotDiffReportListing JSON Schema
+
+```json
+{
+ "name": "SnapshotDiffReportListing",
+ "type": "object",
+ "properties":
+ {
+ "SnapshotDiffReportListing":
+ {
+ "type" : "object",
+ "properties" :
+ {
+ "isFromEarlier":
+ {
+ "description" : "the diff is calculated from older to newer snapshot
or not",
+ "type" : "boolean",
+ "required" : true
+ },
+ "lastIndex":
+ {
+ "description" : "the last index of listing iteration",
+ "type" : "integer",
+ "required" : true
+ },
+ "lastPath":
+ {
+ "description" : "String representation of the last path of the
listing iteration",
+ "type" : "string",
+ "required" : true
+ },
+ "modifyList":
+ {
+ "description": "An array of DiffReportListingEntry",
+ "type" : "array",
+ "items" : diffReportListingEntries,
+ "required" : true
+ },
+ "createList":
+ {
+ "description": "An array of DiffReportListingEntry",
+ "type" : "array",
+ "items" : diffReportListingEntries,
+ "required" : true
+ },
+ "deleteList":
+ {
+ "description": "An array of DiffReportListingEntry",
+ "type" : "array",
+ "items" : diffReportListingEntries,
+ "required" : true
+ }
+ }
+ }
+ }
+}
+```
+
+#### DiffReportListing Entries
+
+JavaScript syntax is used to define `diffReportEntries` so that it can be
referred in `SnapshotDiffReport` JSON schema.
+
+```javascript
+var diffReportListingEntries =
+{
+ "type": "object",
+ "properties":
+ {
+ "dirId":
+ {
+ "description" : "inode id of the directory",
+ "type" : "integer",
+ "required" : true
+ },
+ "fileId":
+ {
+ "description" : "inode id of the file",
+ "type" : "integer",
+ "required" : true
+ },
+ "isRereference":
+ {
+ "description" : "this is reference or not",
+ "type" : "boolean",
+ "required" : true
+ },
+ "sourcePath":
+ {
+ "description" : "string representation of path where changes have
happened",
+ "type" : "string",
+ "required" : true
+ },
+ "targetPath":
+ {
+ "description" : "string representation of target path of rename op",
+ "type" : "string",
+ "required" : false
+ }
+ }
+}
+```
+
+
### SnapshottableDirectoryList JSON Schema
```json
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