HADOOP-13663 Index out of range in SysInfoWindows. Contributed by Inigo Goiri

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SysInfoWindows.java

@@ -100,36 +100,40 @@ public class SysInfoWindows extends SysInfo {
       String sysInfoStr = getSystemInfoInfoFromShell();
       if (sysInfoStr != null) {
         final int sysInfoSplitCount = 11;
-        String[] sysInfo = sysInfoStr.substring(0, sysInfoStr.indexOf("\r\n"))
-            .split(",");
-        if (sysInfo.length == sysInfoSplitCount) {
-          try {
-            vmemSize = Long.parseLong(sysInfo[0]);
-            memSize = Long.parseLong(sysInfo[1]);
-            vmemAvailable = Long.parseLong(sysInfo[2]);
-            memAvailable = Long.parseLong(sysInfo[3]);
-            numProcessors = Integer.parseInt(sysInfo[4]);
-            cpuFrequencyKhz = Long.parseLong(sysInfo[5]);
-            cumulativeCpuTimeMs = Long.parseLong(sysInfo[6]);
-            storageBytesRead = Long.parseLong(sysInfo[7]);
-            storageBytesWritten = Long.parseLong(sysInfo[8]);
-            netBytesRead = Long.parseLong(sysInfo[9]);
-            netBytesWritten = Long.parseLong(sysInfo[10]);
-            if (lastCumCpuTimeMs != -1) {
-              /**
-               * This number will be the aggregated usage across all cores in
-               * [0.0, 100.0]. For example, it will be 400.0 if there are 8
-               * cores and each of them is running at 50% utilization.
-               */
-              cpuUsage = (cumulativeCpuTimeMs - lastCumCpuTimeMs)
-                  * 100F / refreshInterval;
+        int index = sysInfoStr.indexOf("\r\n");
+        if (index >= 0) {
+          String[] sysInfo = sysInfoStr.substring(0, index).split(",");
+          if (sysInfo.length == sysInfoSplitCount) {
+            try {
+              vmemSize = Long.parseLong(sysInfo[0]);
+              memSize = Long.parseLong(sysInfo[1]);
+              vmemAvailable = Long.parseLong(sysInfo[2]);
+              memAvailable = Long.parseLong(sysInfo[3]);
+              numProcessors = Integer.parseInt(sysInfo[4]);
+              cpuFrequencyKhz = Long.parseLong(sysInfo[5]);
+              cumulativeCpuTimeMs = Long.parseLong(sysInfo[6]);
+              storageBytesRead = Long.parseLong(sysInfo[7]);
+              storageBytesWritten = Long.parseLong(sysInfo[8]);
+              netBytesRead = Long.parseLong(sysInfo[9]);
+              netBytesWritten = Long.parseLong(sysInfo[10]);
+              if (lastCumCpuTimeMs != -1) {
+                /**
+                 * This number will be the aggregated usage across all cores in
+                 * [0.0, 100.0]. For example, it will be 400.0 if there are 8
+                 * cores and each of them is running at 50% utilization.
+                 */
+                cpuUsage = (cumulativeCpuTimeMs - lastCumCpuTimeMs)
+                    * 100F / refreshInterval;
+              }
+            } catch (NumberFormatException nfe) {
+              LOG.warn("Error parsing sysInfo", nfe);
             }
-          } catch (NumberFormatException nfe) {
-            LOG.warn("Error parsing sysInfo", nfe);
+          } else {
+            LOG.warn("Expected split length of sysInfo to be "
+                + sysInfoSplitCount + ". Got " + sysInfo.length);
           }
         } else {
-          LOG.warn("Expected split length of sysInfo to be "
-              + sysInfoSplitCount + ". Got " + sysInfo.length);
+          LOG.warn("Wrong output from sysInfo: " + sysInfoStr);
         }
       }
     }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestSysInfoWindows.java

@@ -141,10 +141,15 @@ public class TestSysInfoWindows {
   @Test(timeout = 10000)
   public void errorInGetSystemInfo() {
     SysInfoWindowsMock tester = new SysInfoWindowsMock();
-    // info str derived from windows shell command has \r\n termination
+    // info str derived from windows shell command is null
     tester.setSysinfoString(null);
     // call a method to refresh values
     tester.getAvailablePhysicalMemorySize();
+
+    // info str derived from windows shell command with no \r\n termination
+    tester.setSysinfoString("");
+    // call a method to refresh values
+    tester.getAvailablePhysicalMemorySize();
   }
 
 }