HDFS-9905. WebHdfsFileSystem#runWithRetry should display original stack trace on error. (Wei-Chiu Chuang via iwasakims)

(cherry picked from commit 6fcde2e38d)

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java

@@ -737,8 +737,10 @@ public class WebHdfsFileSystem extends FileSystem
             node = url.getAuthority();
           }
           try {
-              ioe = ioe.getClass().getConstructor(String.class)
+            IOException newIoe = ioe.getClass().getConstructor(String.class)
                 .newInstance(node + ": " + ioe.getMessage());
+            newIoe.setStackTrace(ioe.getStackTrace());
+            ioe = newIoe;
           } catch (NoSuchMethodException | SecurityException 
                    | InstantiationException | IllegalAccessException
                    | IllegalArgumentException | InvocationTargetException e) {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHdfsTimeouts.java

@@ -18,7 +18,6 @@
 
 package org.apache.hadoop.hdfs.web;
 
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
 import java.io.BufferedReader;
@@ -46,6 +45,7 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.security.authentication.client.ConnectionConfigurator;
+import org.apache.hadoop.test.GenericTestUtils;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.runner.RunWith;
@@ -150,7 +150,8 @@ public class TestWebHdfsTimeouts {
       fs.listFiles(new Path("/"), false);
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": connect timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(fs.getUri().getAuthority()
+          + ": connect timed out",e);
     }
   }
 
@@ -163,7 +164,8 @@ public class TestWebHdfsTimeouts {
       fs.listFiles(new Path("/"), false);
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": Read timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(fs.getUri().getAuthority() +
+          ": Read timed out", e);
     }
   }
 
@@ -178,7 +180,8 @@ public class TestWebHdfsTimeouts {
       fs.getDelegationToken("renewer");
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": connect timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(fs.getUri().getAuthority() +
+          ": connect timed out", e);
     }
   }
 
@@ -192,7 +195,8 @@ public class TestWebHdfsTimeouts {
       fs.getDelegationToken("renewer");
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": Read timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(
+          fs.getUri().getAuthority() + ": Read timed out", e);
     }
   }
 
@@ -207,7 +211,8 @@ public class TestWebHdfsTimeouts {
       fs.getFileChecksum(new Path("/file"));
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": connect timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(
+          fs.getUri().getAuthority() + ": connect timed out", e);
     }
   }
 
@@ -222,7 +227,8 @@ public class TestWebHdfsTimeouts {
       fs.getFileChecksum(new Path("/file"));
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": Read timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(
+          fs.getUri().getAuthority() + ": Read timed out", e);
     }
   }
 
@@ -238,7 +244,8 @@ public class TestWebHdfsTimeouts {
       os = fs.create(new Path("/file"));
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals(fs.getUri().getAuthority() + ": connect timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains(
+          fs.getUri().getAuthority() + ": connect timed out", e);
     } finally {
       IOUtils.cleanup(LOG, os);
     }
@@ -258,7 +265,7 @@ public class TestWebHdfsTimeouts {
       os = null;
       fail("expected timeout");
     } catch (SocketTimeoutException e) {
-      assertEquals("Read timed out", e.getMessage());
+      GenericTestUtils.assertExceptionContains("Read timed out", e);
     } finally {
       IOUtils.cleanup(LOG, os);
     }