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https://issues.apache.org/jira/browse/HADOOP-19672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18023070#comment-18023070
 ] 

ASF GitHub Bot commented on HADOOP-19672:
-----------------------------------------

anmolanmol1234 commented on code in PR #7967:
URL: https://github.com/apache/hadoop/pull/7967#discussion_r2381793492


##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsConnectionManager.java:
##########
@@ -91,26 +92,34 @@ class AbfsConnectionManager implements 
HttpClientConnectionManager {
   /**
    * The base host for which connections are managed.
    */
-  private HttpHost baseHost;
+  private final HttpHost baseHost;
 
   AbfsConnectionManager(Registry<ConnectionSocketFactory> 
socketFactoryRegistry,
-      AbfsHttpClientConnectionFactory connectionFactory, KeepAliveCache kac,
-      final AbfsConfiguration abfsConfiguration, final URL baseUrl) {
+      AbfsHttpClientConnectionFactory connectionFactory,
+      KeepAliveCache kac,
+      final AbfsConfiguration abfsConfiguration,
+      final URL baseUrl,
+      final boolean isCacheWarmupNeeded) {
     this.httpConnectionFactory = connectionFactory;
     this.kac = kac;
     this.connectionOperator = new DefaultHttpClientConnectionOperator(
         socketFactoryRegistry, null, null);
     this.abfsConfiguration = abfsConfiguration;
-    if (abfsConfiguration.getApacheCacheWarmupCount() > 0
+    this.baseHost = new HttpHost(baseUrl.getHost(),
+        baseUrl.getDefaultPort(), baseUrl.getProtocol());
+    if (isCacheWarmupNeeded && abfsConfiguration.getApacheCacheWarmupCount() > 0
         && kac.getFixedThreadPool() != null) {
       // Warm up the cache with connections.
       LOG.debug("Warming up the KeepAliveCache with {} connections",
           abfsConfiguration.getApacheCacheWarmupCount());
-      this.baseHost = new HttpHost(baseUrl.getHost(),
-          baseUrl.getDefaultPort(), baseUrl.getProtocol());
       HttpRoute route = new HttpRoute(baseHost, null, true);
-      cacheExtraConnection(route,
+      int totalConnectionsCreated = cacheExtraConnection(route,
           abfsConfiguration.getApacheCacheWarmupCount());
+      if (totalConnectionsCreated == 0) {

Review Comment:
   even if we fail or catch rejected exception for any one of the tasks we want 
to register fallback as the successfully submitted tasks might have increased 
the count of totalConnectionsCreated
   





> ABFS: Network Error-Based Client Switchover: Apache to JDK (continuous 
> failure))
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-19672
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19672
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 3.4.2
>            Reporter: Manish Bhatt
>            Assignee: Manish Bhatt
>            Priority: Major
>              Labels: pull-request-available
>




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