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HADOOP-10622. Shell.runCommand can deadlock. Contributed by Gera Shegalov

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602033 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jason Darrell Lowe 2014-06-11 22:05:04 +00:00
parent 22ec67ea6f
commit 1758f3146a
2 changed files with 20 additions and 13 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -532,6 +532,8 @@ Release 2.5.0 - UNRELEASED
HADOOP-10656. The password keystore file is not picked by LDAP group mapping
(brandonli)
HADOOP-10622. Shell.runCommand can deadlock (Gera Shegalov via jlowe)
BREAKDOWN OF HADOOP-10514 SUBTASKS AND RELATED JIRAS
HADOOP-10520. Extended attributes definition and FileSystem APIs for

31
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Shell.java
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@ -526,12 +526,8 @@ public void run() {
}
// wait for the process to finish and check the exit code
exitCode = process.waitFor();
try {
// make sure that the error thread exits
errThread.join();
} catch (InterruptedException ie) {
LOG.warn("Interrupted while reading the error stream", ie);
}
// make sure that the error thread exits
joinThread(errThread);
completed.set(true);
//the timeout thread handling
//taken care in finally block
@ -560,13 +556,9 @@ public void run() {
} catch (IOException ioe) {
LOG.warn("Error while closing the input stream", ioe);
}
try {
if (!completed.get()) {
errThread.interrupt();
errThread.join();
}
} catch (InterruptedException ie) {
LOG.warn("Interrupted while joining errThread");
if (!completed.get()) {
errThread.interrupt();
joinThread(errThread);
}
try {
InputStream stderr = process.getErrorStream();
@ -581,6 +573,19 @@ public void run() {
}
}
private static void joinThread(Thread t) {
while (t.isAlive()) {
try {
t.join();
} catch (InterruptedException ie) {
if (LOG.isWarnEnabled()) {
LOG.warn("Interrupted while joining on: " + t, ie);
}
t.interrupt(); // propagate interrupt
}
}
}
/** return an array containing the command name & its parameters */
protected abstract String[] getExecString();