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Posted to common-commits@hadoop.apache.org by aa...@apache.org on 2021/12/17 07:19:11 UTC

[hadoop] branch branch-3.2 updated: HADOOP-13500. Synchronizing iteration of Configuration properties object (#3775)

This is an automated email from the ASF dual-hosted git repository.

aajisaka pushed a commit to branch branch-3.2
in repository https://gitbox.apache.org/repos/asf/hadoop.git


The following commit(s) were added to refs/heads/branch-3.2 by this push:
     new 253b217  HADOOP-13500. Synchronizing iteration of Configuration properties object (#3775)
253b217 is described below

commit 253b217efa1650bbd6da35b0eeeb3d7504171ecb
Author: Dhananjay Badaya <11...@users.noreply.github.com>
AuthorDate: Fri Dec 17 12:35:46 2021 +0530

    HADOOP-13500. Synchronizing iteration of Configuration properties object (#3775)
    
    Signed-off-by: Akira Ajisaka <aa...@apache.org>
    (cherry picked from commit 4483607a4edc0f13264f4ea37abd90aba97e1ef0)
---
 .../java/org/apache/hadoop/conf/Configuration.java | 10 +++++---
 .../org/apache/hadoop/conf/TestConfiguration.java  | 29 ++++++++++++++++++++++
 2 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java
index 14af61c..7301af6 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java
@@ -2906,11 +2906,13 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
     // methods that allow non-strings to be put into configurations are removed,
     // we could replace properties with a Map<String,String> and get rid of this
     // code.
-    Map<String,String> result = new HashMap<String,String>();
-    for(Map.Entry<Object,Object> item: getProps().entrySet()) {
-      if (item.getKey() instanceof String &&
-          item.getValue() instanceof String) {
+    Properties props = getProps();
+    Map<String, String> result = new HashMap<>();
+    synchronized (props) {
+      for (Map.Entry<Object, Object> item : props.entrySet()) {
+        if (item.getKey() instanceof String && item.getValue() instanceof String) {
           result.put((String) item.getKey(), (String) item.getValue());
+        }
       }
     }
     return result.entrySet().iterator();
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java
index aebefe0..209d0c9 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java
@@ -38,6 +38,7 @@ import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.ConcurrentModificationException;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -45,6 +46,7 @@ import java.util.Map;
 import java.util.Properties;
 import java.util.Random;
 import java.util.Set;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.regex.Pattern;
 import static java.util.concurrent.TimeUnit.*;
 
@@ -2590,4 +2592,31 @@ public class TestConfiguration {
     assertEquals("  prefix >cdata\nsuffix  ", conf.get("cdata-whitespace"));
     return conf;
   }
+
+  @Test
+  public void testConcurrentModificationDuringIteration() throws InterruptedException {
+    Configuration configuration = new Configuration();
+    new Thread(() -> {
+      while (true) {
+        configuration.set(String.valueOf(Math.random()), String.valueOf(Math.random()));
+      }
+    }).start();
+
+    AtomicBoolean exceptionOccurred = new AtomicBoolean(false);
+
+    new Thread(() -> {
+      while (true) {
+        try {
+          configuration.iterator();
+        } catch (final ConcurrentModificationException e) {
+          exceptionOccurred.set(true);
+          break;
+        }
+      }
+    }).start();
+
+    Thread.sleep(1000); //give enough time for threads to run
+
+    assertFalse("ConcurrentModificationException occurred", exceptionOccurred.get());
+  }
 }

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