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HDFS-15703. Don't generate edits for set operations that are no-op (#2508). Contributed by Daryn Sharp and Ahmed Hussein 

(cherry picked from commit 60201cbf69)
This commit is contained in:
Ahmed Hussein 2020-12-02 15:38:20 -06:00 committed by Jim Brennan
parent 6cc0824072
commit 91310102d7
2 changed files with 67 additions and 7 deletions
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18
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAttrOp.java
View File

@ -57,15 +57,18 @@ public class FSDirAttrOp {
throw new InvalidPathException(src);
}
INodesInPath iip;
boolean changed;
fsd.writeLock();
try {
iip = fsd.resolvePath(pc, src, DirOp.WRITE);
fsd.checkOwner(pc, iip);
unprotectedSetPermission(fsd, iip, permission);
changed = unprotectedSetPermission(fsd, iip, permission);
} finally {
fsd.writeUnlock();
}
if (changed) {
fsd.getEditLog().logSetPermissions(iip.getPath(), permission);
}
return fsd.getAuditFileInfo(iip);
}
@ -76,6 +79,7 @@ public class FSDirAttrOp {
throw new InvalidPathException(src);
}
INodesInPath iip;
boolean changed;
fsd.writeLock();
try {
iip = fsd.resolvePath(pc, src, DirOp.WRITE);
@ -90,11 +94,13 @@ public class FSDirAttrOp {
"User " + pc.getUser() + " does not belong to " + group);
}
}
unprotectedSetOwner(fsd, iip, username, group);
changed = unprotectedSetOwner(fsd, iip, username, group);
} finally {
fsd.writeUnlock();
}
if (changed) {
fsd.getEditLog().logSetOwner(iip.getPath(), username, group);
}
return fsd.getAuditFileInfo(iip);
}
@ -256,28 +262,32 @@ public class FSDirAttrOp {
}
}
static void unprotectedSetPermission(
static boolean unprotectedSetPermission(
FSDirectory fsd, INodesInPath iip, FsPermission permissions)
throws FileNotFoundException, UnresolvedLinkException,
QuotaExceededException, SnapshotAccessControlException {
assert fsd.hasWriteLock();
final INode inode = FSDirectory.resolveLastINode(iip);
int snapshotId = iip.getLatestSnapshotId();
long oldPerm = inode.getPermissionLong();
inode.setPermission(permissions, snapshotId);
return oldPerm != inode.getPermissionLong();
}
static void unprotectedSetOwner(
static boolean unprotectedSetOwner(
FSDirectory fsd, INodesInPath iip, String username, String groupname)
throws FileNotFoundException, UnresolvedLinkException,
QuotaExceededException, SnapshotAccessControlException {
assert fsd.hasWriteLock();
final INode inode = FSDirectory.resolveLastINode(iip);
long oldPerm = inode.getPermissionLong();
if (username != null) {
inode.setUser(username, iip.getLatestSnapshotId());
}
if (groupname != null) {
inode.setGroup(groupname, iip.getLatestSnapshotId());
}
return oldPerm != inode.getPermissionLong();
}
static boolean setTimes(

52
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSDirAttrOp.java
View File

@ -20,8 +20,10 @@ package org.apache.hadoop.hdfs.server.namenode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager;
import org.junit.Test;
import org.mockito.Mockito;
@ -57,6 +59,54 @@ public class TestFSDirAttrOp {
return FSDirAttrOp.unprotectedSetTimes(fsd, iip, mtime, atime, force);
}
private boolean unprotectedSetAttributes(short currPerm, short newPerm)
throws Exception {
return unprotectedSetAttributes(currPerm, newPerm, "user1", "user1",
false);
}
private boolean unprotectedSetAttributes(short currPerm, short newPerm,
String currUser, String newUser, boolean testChangeOwner)
throws Exception {
String groupName = "testGroup";
FsPermission originalPerm = new FsPermission(currPerm);
FsPermission updatedPerm = new FsPermission(newPerm);
FSNamesystem fsn = Mockito.mock(FSNamesystem.class);
SnapshotManager ssMgr = Mockito.mock(SnapshotManager.class);
FSDirectory fsd = Mockito.mock(FSDirectory.class);
INodesInPath iip = Mockito.mock(INodesInPath.class);
when(fsd.getFSNamesystem()).thenReturn(fsn);
when(fsn.getSnapshotManager()).thenReturn(ssMgr);
when(ssMgr.getSkipCaptureAccessTimeOnlyChange()).thenReturn(false);
when(fsd.getAccessTimePrecision()).thenReturn(1000L);
when(fsd.hasWriteLock()).thenReturn(Boolean.TRUE);
when(iip.getLatestSnapshotId()).thenReturn(0);
INode inode = new INodeDirectory(1000, DFSUtil.string2Bytes(""),
new PermissionStatus(currUser, "testGroup", originalPerm), 0L);
when(iip.getLastINode()).thenReturn(inode);
return testChangeOwner ? FSDirAttrOp.unprotectedSetOwner(fsd, iip, newUser,
groupName) : FSDirAttrOp.unprotectedSetPermission(fsd, iip,
updatedPerm);
}
@Test
public void testUnprotectedSetPermissions() throws Exception {
assertTrue("setPermissions return true for updated permissions",
unprotectedSetAttributes((short) 0777, (short) 0));
assertFalse("setPermissions should return false for same permissions",
unprotectedSetAttributes((short) 0777, (short) 0777));
}
@Test
public void testUnprotectedSetOwner() throws Exception {
assertTrue("SetOwner should return true for a new user",
unprotectedSetAttributes((short) 0777, (short) 0777, "user1",
"user2", true));
assertFalse("SetOwner should return false for same user",
unprotectedSetAttributes((short) 0777, (short) 0777, "user1",
"user1", true));
}
@Test
public void testUnprotectedSetTimes() throws Exception {
// atime < access time + precision