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new 523ff816246 HDFS-16952. Support getLinkTarget API in WebHDFS (#5517)
523ff816246 is described below
commit 523ff816246322e7376c52b3c8df92c0d6e4f6ef
Author: zhtttylz <hualon...@hotmail.com>
AuthorDate: Thu Apr 6 19:44:47 2023 +0800
HDFS-16952. Support getLinkTarget API in WebHDFS (#5517)
Co-authored-by: Zhtttylz <hualon...@hotmail.com>
Reviewed-by: Shilun Fan <slfan1...@apache.org>
Signed-off-by: Shilun Fan <slfan1...@apache.org>
---
.../apache/hadoop/hdfs/web/WebHdfsFileSystem.java | 13 ++++++++++
.../hadoop/hdfs/web/resources/GetOpParam.java | 1 +
.../federation/router/RouterWebHdfsMethods.java | 1 +
.../web/resources/NamenodeWebHdfsMethods.java | 5 ++++
.../hadoop-hdfs/src/site/markdown/WebHDFS.md | 17 +++++++++++++
.../org/apache/hadoop/hdfs/web/TestWebHDFS.java | 28 ++++++++++++++++++++++
6 files changed, 65 insertions(+)
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
index f0774e98d1f..615cf3bd7c2 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
@@ -2147,6 +2147,19 @@ public class WebHdfsFileSystem extends FileSystem
}.run();
}
+ @Override
+ public Path getLinkTarget(Path f) throws IOException {
+ statistics.incrementReadOps(1);
+ storageStatistics.incrementOpCounter(OpType.GET_LINK_TARGET);
+ final HttpOpParam.Op op = GetOpParam.Op.GETLINKTARGET;
+ return new FsPathResponseRunner<Path>(op, f) {
+ @Override
+ Path decodeResponse(Map<?, ?> json) {
+ return new Path((String) json.get(Path.class.getSimpleName()));
+ }
+ }.run();
+ }
+
@VisibleForTesting
InetSocketAddress[] getResolvedNNAddr() {
return nnAddrs;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
index 14938c3c45b..89979295c79 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
@@ -64,6 +64,7 @@ public class GetOpParam extends HttpOpParam<GetOpParam.Op> {
GETSNAPSHOTDIFF(false, HttpURLConnection.HTTP_OK),
GETSNAPSHOTDIFFLISTING(false, HttpURLConnection.HTTP_OK),
GETSNAPSHOTTABLEDIRECTORYLIST(false, HttpURLConnection.HTTP_OK),
+ GETLINKTARGET(false, HttpURLConnection.HTTP_OK),
GETSNAPSHOTLIST(false, HttpURLConnection.HTTP_OK);
final boolean redirect;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
b/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
index a66953b1bd7..477a59941fe 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
@@ -385,6 +385,7 @@ public class RouterWebHdfsMethods extends
NamenodeWebHdfsMethods {
case GETXATTRS:
case LISTXATTRS:
case CHECKACCESS:
+ case GETLINKTARGET:
{
return super.get(ugi, delegation, username, doAsUser, fullpath, op,
offset, length, renewer, bufferSize, xattrNames, xattrEncoding,
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
index a3250c213ca..4b3b53731ee 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
@@ -1383,6 +1383,11 @@ public class NamenodeWebHdfsMethods {
final String js = JsonUtil.toJsonString(snapshotList);
return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
}
+ case GETLINKTARGET: {
+ String target = cp.getLinkTarget(fullpath);
+ final String js = JsonUtil.toJsonString("Path", target);
+ return Response.ok(js).type(MediaType.APPLICATION_JSON).build();
+ }
default:
throw new UnsupportedOperationException(op + " is not supported");
}
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 5e5924ad36e..f84018ae821 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
@@ -58,6 +58,7 @@ The HTTP REST API supports the complete
[FileSystem](../../api/org/apache/hadoop
* [`GETFILEBLOCKLOCATIONS`](#Get_File_Block_Locations) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getFileBlockLocations)
* [`GETECPOLICY`](#Get_EC_Policy) (see
[HDFSErasureCoding](./HDFSErasureCoding.html#Administrative_commands).getErasureCodingPolicy)
* [`GETSERVERDEFAULTS`](#Get_Server_Defaults) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getServerDefaults)
+ * [`GETLINKTARGET`](#Get_Link_Target) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getLinkTarget)
* HTTP PUT
* [`CREATE`](#Create_and_Write_to_a_File) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).create)
* [`MKDIRS`](#Make_a_Directory) (see
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).mkdirs)
@@ -1139,6 +1140,22 @@ See also:
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).access
See also:
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getServerDefaults
+### Get Link Target
+
+* Submit a HTTP GET request.
+
+ curl -i "http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GETLINKTARGET"
+
+ The client receives a response with a [`Path` JSON
object](#Path_JSON_Schema):
+
+ HTTP/1.1 200 OK
+ Content-Type: application/json
+ Transfer-Encoding: chunked
+
+ {"Path": "/user/username/targetFile"}
+
+See also:
[FileSystem](../../api/org/apache/hadoop/fs/FileSystem.html).getLinkTarget
+
Storage Policy Operations
-------------------------
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
index c4f53b05615..8f4759d8e30 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
@@ -2202,6 +2202,34 @@ public class TestWebHDFS {
cluster.shutdown();
}
}
+
+ @Test
+ public void testLinkTarget() throws Exception {
+ final Configuration conf = WebHdfsTestUtil.createConf();
+ try {
+ cluster = new MiniDFSCluster.Builder(conf)
+ .numDataNodes(3)
+ .build();
+ cluster.waitActive();
+
+ final WebHdfsFileSystem webHdfs =
+ WebHdfsTestUtil.getWebHdfsFileSystem(conf,
+ WebHdfsConstants.WEBHDFS_SCHEME);
+
+ // Symbolic link
+ Path root = new Path("/webHdfsTest/");
+ Path targetFile = new Path(root, "debug.log");
+ FileSystemTestHelper.createFile(webHdfs, targetFile);
+
+ Path symLink = new Path(root, "debug.link");
+
+ webHdfs.createSymlink(targetFile, symLink, false);
+ assertEquals(webHdfs.getLinkTarget(symLink), targetFile);
+ } finally {
+ cluster.shutdown();
+ }
+ }
+
/**
* Get FileStatus JSONObject from ListStatus response.
*/
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