HADOOP-13770. Shell.checkIsBashSupported swallowed an interrupted exception. Contributed by Wei-Chiu Chuang

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

@@ -734,8 +734,7 @@ public abstract class Shell {
     }
   }
 
-  public static final boolean isBashSupported = checkIsBashSupported();
-  private static boolean checkIsBashSupported() {
+  public static boolean checkIsBashSupported() throws InterruptedIOException {
     if (Shell.WINDOWS) {
       return false;
     }
@@ -746,6 +745,9 @@ public abstract class Shell {
       String[] args = {"bash", "-c", "echo 1000"};
       shexec = new ShellCommandExecutor(args);
       shexec.execute();
+    } catch (InterruptedIOException iioe) {
+      LOG.warn("Interrupted, unable to determine if bash is supported", iioe);
+      throw iioe;
     } catch (IOException ioe) {
       LOG.warn("Bash is not supported by the OS", ioe);
       supported = false;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NodeManager.java

@@ -750,7 +750,7 @@ public class NodeManager extends CompositeService
       // Failed to start if we're a Unix based system but we don't have bash.
       // Bash is necessary to launch containers under Unix-based systems.
       if (!Shell.WINDOWS) {
-        if (!Shell.isBashSupported) {
+        if (!Shell.checkIsBashSupported()) {
           String message =
               "Failing NodeManager start since we're on a "
                   + "Unix-based system but bash doesn't seem to be available.";