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HDFS-4525. Provide an API for knowing that whether file is closed or not. Contributed by SreeHari. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1465434 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uma Maheswara Rao G 2013-04-07 18:01:17 +00:00
parent 7f13207ed1
commit c5bb615317
10 changed files with 142 additions and 3 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -390,6 +390,9 @@ Release 2.0.5-beta - UNRELEASED
HDFS-4618. Default transaction interval for checkpoints is too low. (todd)
HDFS-4525. Provide an API for knowing that whether file is closed or not.
(SreeHari via umamahesh)
OPTIMIZATIONS
BUG FIXES

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
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@ -1545,6 +1545,21 @@ public class DFSClient implements java.io.Closeable {
}
}
/**
* Close status of a file
* @return true if file is already closed
*/
public boolean isFileClosed(String src) throws IOException{
checkOpen();
try {
return namenode.isFileClosed(src);
} catch(RemoteException re) {
throw re.unwrapRemoteException(AccessControlException.class,
FileNotFoundException.class,
UnresolvedPathException.class);
}
}
/**
* Get the file info for a specific file or directory. If src
* refers to a symlink then the FileStatus of the link is returned.

13
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java
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@ -917,4 +917,17 @@ public class DistributedFileSystem extends FileSystem {
public boolean isInSafeMode() throws IOException {
return setSafeMode(SafeModeAction.SAFEMODE_GET, true);
}
/**
* Get the close status of a file
* @param src The path to the file
*
* @return return true if file is closed
* @throws FileNotFoundException if the file does not exist.
* @throws IOException If an I/O error occurred
*/
public boolean isFileClosed(Path src) throws IOException {
return dfs.isFileClosed(getPathName(src));
}
}

14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java
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@ -758,6 +758,20 @@ public interface ClientProtocol {
public HdfsFileStatus getFileInfo(String src) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException;
/**
* Get the close status of a file
* @param src The string representation of the path to the file
*
* @return return true if file is closed
* @throws AccessControlException permission denied
* @throws FileNotFoundException file <code>src</code> is not found
* @throws UnresolvedLinkException if the path contains a symlink.
* @throws IOException If an I/O error occurred
*/
@Idempotent
public boolean isFileClosed(String src) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException;
/**
* Get the file info for a specific file or directory. If the path
* refers to a symlink then the FileStatus of the symlink is returned.

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java
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@ -76,6 +76,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetPre
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetPreferredBlockSizeResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetServerDefaultsRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetServerDefaultsResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.MetaSaveRequestProto;
@ -864,4 +866,17 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
throw new ServiceException(e);
}
}
@Override
public IsFileClosedResponseProto isFileClosed(
RpcController controller, IsFileClosedRequestProto request)
throws ServiceException {
try {
boolean result = server.isFileClosed(request.getSrc());
return IsFileClosedResponseProto.newBuilder().setResult(result).build();
} catch (IOException e) {
throw new ServiceException(e);
}
}
}

14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java
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@ -77,6 +77,7 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetLis
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetListingResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetPreferredBlockSizeRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetServerDefaultsRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.MetaSaveRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.MkdirsRequestProto;
@ -851,6 +852,19 @@ public class ClientNamenodeProtocolTranslatorPB implements
}
}
@Override
public boolean isFileClosed(String src) throws AccessControlException,
FileNotFoundException, UnresolvedLinkException, IOException {
IsFileClosedRequestProto req = IsFileClosedRequestProto.newBuilder()
.setSrc(src).build();
try {
return rpcProxy.isFileClosed(null, req).getResult();
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public Object getUnderlyingProxyObject() {
return rpcProxy;

27
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -2974,6 +2974,33 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
return stat;
}
/**
* Returns true if the file is closed
*/
boolean isFileClosed(String src)
throws AccessControlException, UnresolvedLinkException,
StandbyException, IOException {
FSPermissionChecker pc = getPermissionChecker();
checkOperation(OperationCategory.READ);
readLock();
try {
checkOperation(OperationCategory.READ);
if (isPermissionEnabled) {
checkTraverse(pc, src);
}
return !INodeFile.valueOf(dir.getINode(src), src).isUnderConstruction();
} catch (AccessControlException e) {
if (isAuditEnabled() && isExternalInvocation()) {
logAuditEvent(false, UserGroupInformation.getCurrentUser(),
getRemoteIp(),
"isFileClosed", src, null, null);
}
throw e;
} finally {
readUnlock();
}
}
/**
* Create all the necessary directories
*/

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java
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@ -691,6 +691,11 @@ class NameNodeRpcServer implements NamenodeProtocols {
return namesystem.getFileInfo(src, true);
}
@Override // ClientProtocol
public boolean isFileClosed(String src) throws IOException{
return namesystem.isFileClosed(src);
}
@Override // ClientProtocol
public HdfsFileStatus getFileLinkInfo(String src) throws IOException {
metrics.incrFileInfoOps();

10
hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto
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@ -332,6 +332,14 @@ message GetFileInfoResponseProto {
optional HdfsFileStatusProto fs = 1;
}
message IsFileClosedRequestProto {
required string src = 1;
}
message IsFileClosedResponseProto {
required bool result = 1;
}
message GetFileLinkInfoRequestProto {
required string src = 1;
}
@ -498,4 +506,6 @@ service ClientNamenodeProtocol {
returns(SetBalancerBandwidthResponseProto);
rpc getDataEncryptionKey(GetDataEncryptionKeyRequestProto)
returns(GetDataEncryptionKeyResponseProto);
rpc isFileClosed(IsFileClosedRequestProto)
returns(IsFileClosedResponseProto);
}

23
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
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@ -762,4 +762,27 @@ public class TestDistributedFileSystem {
}
}
}
@Test(timeout=60000)
public void testFileCloseStatus() throws IOException {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
DistributedFileSystem fs = cluster.getFileSystem();
try {
// create a new file.
Path file = new Path("/simpleFlush.dat");
FSDataOutputStream output = fs.create(file);
// write to file
output.writeBytes("Some test data");
output.flush();
assertFalse("File status should be open", fs.isFileClosed(file));
output.close();
assertTrue("File status should be closed", fs.isFileClosed(file));
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}