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HDFS-4242. Map.Entry is incorrectly used in LeaseManager since the behavior of it is undefined after the iteration or modifications of the map.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1415480 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2012-11-30 02:51:25 +00:00
parent 1943fdbec6
commit 6b08d7de5f
2 changed files with 14 additions and 7 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -639,6 +639,10 @@ Release 2.0.3-alpha - Unreleased
HDFS-4216. Do not ignore QuotaExceededException when adding symlinks.
(szetszwo)
HDFS-4242. Map.Entry is incorrectly used in LeaseManager since the behavior
of it is undefined after the iteration or modifications of the map.
(szetszwo)
Release 2.0.2-alpha - 2012-09-07
INCOMPATIBLE CHANGES

17
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
View File

@ -17,9 +17,12 @@
*/
package org.apache.hadoop.hdfs.server.namenode;
import static org.apache.hadoop.util.Time.now;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
@ -39,8 +42,6 @@
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import static org.apache.hadoop.util.Time.now;
/**
* LeaseManager does the lease housekeeping for writing on files.
* This class also provides useful static methods for lease recovery.
@ -340,7 +341,8 @@ synchronized void changeLease(String src, String dst,
}
final int len = overwrite.length();
for(Map.Entry<String, Lease> entry : findLeaseWithPrefixPath(src, sortedLeasesByPath)) {
for(Map.Entry<String, Lease> entry
: findLeaseWithPrefixPath(src, sortedLeasesByPath).entrySet()) {
final String oldpath = entry.getKey();
final Lease lease = entry.getValue();
//overwrite must be a prefix of oldpath
@ -355,7 +357,8 @@ synchronized void changeLease(String src, String dst,
}
synchronized void removeLeaseWithPrefixPath(String prefix) {
for(Map.Entry<String, Lease> entry : findLeaseWithPrefixPath(prefix, sortedLeasesByPath)) {
for(Map.Entry<String, Lease> entry
: findLeaseWithPrefixPath(prefix, sortedLeasesByPath).entrySet()) {
if (LOG.isDebugEnabled()) {
LOG.debug(LeaseManager.class.getSimpleName()
+ ".removeLeaseWithPrefixPath: entry=" + entry);
@ -364,13 +367,13 @@ synchronized void removeLeaseWithPrefixPath(String prefix) {
}
}
static private List<Map.Entry<String, Lease>> findLeaseWithPrefixPath(
static private Map<String, Lease> findLeaseWithPrefixPath(
String prefix, SortedMap<String, Lease> path2lease) {
if (LOG.isDebugEnabled()) {
LOG.debug(LeaseManager.class.getSimpleName() + ".findLease: prefix=" + prefix);
}
List<Map.Entry<String, Lease>> entries = new ArrayList<Map.Entry<String, Lease>>();
final Map<String, Lease> entries = new HashMap<String, Lease>();
final int srclen = prefix.length();
for(Map.Entry<String, Lease> entry : path2lease.tailMap(prefix).entrySet()) {
@ -379,7 +382,7 @@ static private List<Map.Entry<String, Lease>> findLeaseWithPrefixPath(
return entries;
}
if (p.length() == srclen || p.charAt(srclen) == Path.SEPARATOR_CHAR) {
entries.add(entry);
entries.put(entry.getKey(), entry.getValue());
}
}
return entries;