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HDFS-16952. Support getLinkTarget API in WebHDFS (#5517) 

Co-authored-by: Zhtttylz <hualong.z@hotmail.com>
Reviewed-by: Shilun Fan <slfan1989@apache.org>
Signed-off-by: Shilun Fan <slfan1989@apache.org>
This commit is contained in:
zhtttylz 2023-04-06 19:44:47 +08:00 committed by GitHub
parent 47c22e388e
commit 523ff81624
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6 changed files with 65 additions and 0 deletions
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13
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
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@ -2147,6 +2147,19 @@ FsServerDefaults decodeResponse(Map<?, ?> json) throws IOException {
}.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;

1
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/GetOpParam.java
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@ -64,6 +64,7 @@ public enum Op implements HttpOpParam.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;

1
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterWebHdfsMethods.java
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@ -385,6 +385,7 @@ protected Response get(
case GETXATTRS:
case LISTXATTRS:
case CHECKACCESS:
case GETLINKTARGET:
{
return super.get(ugi, delegation, username, doAsUser, fullpath, op,
offset, length, renewer, bufferSize, xattrNames, xattrEncoding,

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
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@ -1383,6 +1383,11 @@ protected Response get(
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");
}

17
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/WebHDFS.md
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@ -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
-------------------------

28
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java
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@ -2202,6 +2202,34 @@ public void testStatistics() throws Exception {
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.
*/