iwasakims commented on a change in pull request #316: FLUME-3355. Upgrade Kafka 
to 2.3.1.
URL: https://github.com/apache/flume/pull/316#discussion_r379902064
 
 

 ##########
 File path: pom.xml
 ##########
 @@ -116,7 +116,7 @@ limitations under the License.
     <xalan.version>2.7.2</xalan.version>
     <xerces.version>2.9.1</xerces.version>
     <wiremock.version>1.53</wiremock.version>
-    <zookeeper.version>3.4.5</zookeeper.version>
+    <zookeeper.version>3.4.13</zookeeper.version>
 
 Review comment:
   @tmgstevens We need to upgrade ZooKeeper to 3.4.7 at least for Kafka 2.1.0 
and above which uses functionality backported on 
[ZOOKEEPER-2237](https://issues.apache.org/jira/browse/ZOOKEEPER-2237). Unit 
tests fail with following error if ``zookeeper.version`` is 3.4.5, though there 
is no compilation error.
   ```
   2020-02-16 12:43:05,908 (main) [ERROR - 
org.slf4j.helpers.MarkerIgnoringBase.error(MarkerIgnoringBase.java:159)] Fatal 
error during KafkaServer startup. Prepare to shutdown
   java.lang.NoClassDefFoundError: 
org/apache/zookeeper/AsyncCallback$MultiCallback
           at kafka.zk.KafkaZkClient$.apply(KafkaZkClient.scala:1825)
           at 
kafka.server.KafkaServer.kafka$server$KafkaServer$$createZkClient$1(KafkaServer.scala:363)
           at kafka.server.KafkaServer.initZkClient(KafkaServer.scala:387)
           at kafka.server.KafkaServer.startup(KafkaServer.scala:207)
           at 
kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:38)
           at 
org.apache.flume.source.kafka.KafkaSourceEmbeddedKafka.<init>(KafkaSourceEmbeddedKafka.java:84)
           at 
org.apache.flume.source.kafka.TestKafkaSource.startKafkaServer(TestKafkaSource.java:112)
           ...(snip)
   ```

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