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https://issues.apache.org/jira/browse/HDFS-10948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Zhuge reassigned HDFS-10948:
---------------------------------
Assignee: John Zhuge
> HDFS setOwner no-op should not generate an edit log transaction
> ---------------------------------------------------------------
>
> Key: HDFS-10948
> URL: https://issues.apache.org/jira/browse/HDFS-10948
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.7.0
> Reporter: Karthik Palaniappan
> Assignee: John Zhuge
> Priority: Minor
> Attachments: testNullUserNullGroup.patch
>
>
> The HDFS setOwner RPC takes a path, optional username, and optional groupname
> (see ClientNamenodeProtocol.proto). If neither username nor groupname are
> set, the RPC is a no-op. However, an entry in the edit log is still
> committed, and when retrieved through getEditsFromTxid, both username and
> groupname are set to the empty string.
> This does not match the behavior of the setTimes RPC. There atime and mtime
> are both required, and you can set "-1" to indicated "don't change the time".
> If both are set to "-1", the RPC is a no-op, and appropriately no edit log
> transaction is created.
> Here's an example of an (untested) patch to fix the issue:
> ```
> diff --git
> a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAttrOp.java
>
> b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAttrOp.java
> index 3dc1c30..0728bc5 100644
> ---
> a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAttrOp.java
> +++
> b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAttrOp.java
> @@ -77,6 +77,7 @@ static HdfsFileStatus setOwner(
> if (FSDirectory.isExactReservedName(src)) {
> throw new InvalidPathException(src);
> }
> + boolean changed = false;
> FSPermissionChecker pc = fsd.getPermissionChecker();
> INodesInPath iip;
> fsd.writeLock();
> @@ -92,11 +93,13 @@ static HdfsFileStatus setOwner(
> throw new AccessControlException("User does not belong to " +
> group);
> }
> }
> - unprotectedSetOwner(fsd, src, username, group);
> + changed = unprotectedSetOwner(fsd, src, username, group);
> } finally {
> fsd.writeUnlock();
> }
> - fsd.getEditLog().logSetOwner(src, username, group);
> + if (changed) {
> + fsd.getEditLog().logSetOwner(src, username, group);
> + }
> return fsd.getAuditFileInfo(iip);
> }
>
> @@ -287,22 +290,27 @@ static void unprotectedSetPermission(
> inode.setPermission(permissions, snapshotId);
> }
>
> - static void unprotectedSetOwner(
> + static boolean unprotectedSetOwner(
> FSDirectory fsd, String src, String username, String groupname)
> throws FileNotFoundException, UnresolvedLinkException,
> QuotaExceededException, SnapshotAccessControlException {
> assert fsd.hasWriteLock();
> + boolean status = false;
> final INodesInPath inodesInPath = fsd.getINodesInPath4Write(src, true);
> INode inode = inodesInPath.getLastINode();
> if (inode == null) {
> throw new FileNotFoundException("File does not exist: " + src);
> }
> if (username != null) {
> + status = true;
> inode = inode.setUser(username, inodesInPath.getLatestSnapshotId());
> }
> if (groupname != null) {
> + status = true;
> inode.setGroup(groupname, inodesInPath.getLatestSnapshotId());
> }
> +
> + return status;
> }
>
> static boolean setTimes(
> ```
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