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HDFS-3359. DFSClient.close should close cached sockets. Contributed by Todd Lipcon. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1333625 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2012-05-03 21:13:52 +00:00
parent 75fab46041
commit 9c5ec67761
3 changed files with 18 additions and 1 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -471,6 +471,8 @@ Release 2.0.0 - UNRELEASED
HDFS-3332. NullPointerException in DN when directoryscanner is trying to
report bad blocks. (Amith D K via umamahesh)
HDFS-3359. DFSClient.close should close cached sockets. (todd)
BREAKDOWN OF HDFS-1623 SUBTASKS
HDFS-2179. Add fencing framework and mechanisms for NameNode HA. (todd)

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
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@ -563,6 +563,7 @@ public class DFSClient implements java.io.Closeable {
void abort() {
clientRunning = false;
closeAllFilesBeingWritten(true);
socketCache.clear();
closeConnectionToNamenode();
}
@ -600,6 +601,7 @@ public class DFSClient implements java.io.Closeable {
public synchronized void close() throws IOException {
if(clientRunning) {
closeAllFilesBeingWritten(false);
socketCache.clear();
clientRunning = false;
leaserenewer.closeClient(this);
// close connections to the namenode

15
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDistributedFileSystem.java
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@ -85,6 +85,7 @@ public class TestDistributedFileSystem {
/**
* Tests DFSClient.close throws no ConcurrentModificationException if
* multiple files are open.
* Also tests that any cached sockets are closed. (HDFS-3359)
*/
@Test
public void testDFSClose() throws Exception {
@ -94,11 +95,23 @@ public class TestDistributedFileSystem {
cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build();
FileSystem fileSys = cluster.getFileSystem();
// create two files
// create two files, leaving them open
fileSys.create(new Path("/test/dfsclose/file-0"));
fileSys.create(new Path("/test/dfsclose/file-1"));
// create another file, close it, and read it, so
// the client gets a socket in its SocketCache
Path p = new Path("/non-empty-file");
DFSTestUtil.createFile(fileSys, p, 1L, (short)1, 0L);
DFSTestUtil.readFile(fileSys, p);
DFSClient client = ((DistributedFileSystem)fileSys).dfs;
SocketCache cache = client.socketCache;
assertEquals(1, cache.size());
fileSys.close();
assertEquals(0, cache.size());
} finally {
if (cluster != null) {cluster.shutdown();}
}