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HDFS-7494. Checking of closed in DFSInputStream#pread() should be protected by synchronization (Ted Yu via Colin P. McCabe) 

(cherry picked from commit a97a1e7317)
This commit is contained in:
Colin Patrick Mccabe 2014-12-16 11:07:27 -08:00
parent 878350a0e8
commit 1b91a6d011
2 changed files with 11 additions and 7 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -341,6 +341,9 @@ Release 2.7.0 - UNRELEASED
HDFS-6425. Large postponedMisreplicatedBlocks has impact on blockReport
latency. (Ming Ma via kihwal)
HDFS-7494. Checking of closed in DFSInputStream#pread() should be protected
by synchronization (Ted Yu via Colin P. McCabe)
Release 2.6.1 - UNRELEASED
INCOMPATIBLE CHANGES

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
View File

@ -41,6 +41,7 @@ import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.classification.InterfaceAudience;
@ -90,7 +91,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
public static boolean tcpReadsDisabledForTesting = false;
private long hedgedReadOpsLoopNumForTesting = 0;
private final DFSClient dfsClient;
private boolean closed = false;
private AtomicBoolean closed = new AtomicBoolean(false);
private final String src;
private final boolean verifyChecksum;
@ -661,7 +662,8 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
*/
@Override
public synchronized void close() throws IOException {
if (closed) {
if (!closed.compareAndSet(false, true)) {
DFSClient.LOG.warn("DFSInputStream has been closed already");
return;
}
dfsClient.checkOpen();
@ -685,7 +687,6 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
blockReader = null;
}
super.close();
closed = true;
}
@Override
@ -822,7 +823,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
private synchronized int readWithStrategy(ReaderStrategy strategy, int off, int len) throws IOException {
dfsClient.checkOpen();
if (closed) {
if (closed.get()) {
throw new IOException("Stream closed");
}
Map<ExtendedBlock,Set<DatanodeInfo>> corruptedBlockMap
@ -1375,7 +1376,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
throws IOException {
// sanity checks
dfsClient.checkOpen();
if (closed) {
if (closed.get()) {
throw new IOException("Stream closed");
}
failures = 0;
@ -1484,7 +1485,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
if (targetPos < 0) {
throw new EOFException("Cannot seek to negative offset");
}
if (closed) {
if (closed.get()) {
throw new IOException("Stream is closed!");
}
boolean done = false;
@ -1571,7 +1572,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
*/
@Override
public synchronized int available() throws IOException {
if (closed) {
if (closed.get()) {
throw new IOException("Stream closed");
}