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HDFS-2877. If locking of a storage dir fails, it will remove the other NN's lock file on exit. Contributed by Todd Lipcon.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1239880 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2012-02-02 22:12:02 +00:00
parent 9eb8f4d267
commit 6d5510dfb8
2 changed files with 14 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1672,6 +1672,9 @@ Release 0.22.1 - Unreleased
BUG FIXES BUG FIXES
HDFS-2877. If locking of a storage dir fails, it will remove the other
NN's lock file on exit. (todd)
Release 0.22.0 - 2011-11-29 Release 0.22.0 - 2011-11-29
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES

12
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Storage.java
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@ -599,8 +599,12 @@ public void lock() throws IOException {
* @throws IOException if locking fails. * @throws IOException if locking fails.
*/ */
FileLock tryLock() throws IOException { FileLock tryLock() throws IOException {
boolean deletionHookAdded = false;
File lockF = new File(root, STORAGE_FILE_LOCK); File lockF = new File(root, STORAGE_FILE_LOCK);
lockF.deleteOnExit(); if (!lockF.exists()) {
lockF.deleteOnExit();
deletionHookAdded = true;
}
RandomAccessFile file = new RandomAccessFile(lockF, "rws"); RandomAccessFile file = new RandomAccessFile(lockF, "rws");
FileLock res = null; FileLock res = null;
try { try {
@ -613,6 +617,12 @@ FileLock tryLock() throws IOException {
file.close(); file.close();
throw e; throw e;
} }
if (res != null && !deletionHookAdded) {
// If the file existed prior to our startup, we didn't
// call deleteOnExit above. But since we successfully locked
// the dir, we can take care of cleaning it up.
lockF.deleteOnExit();
}
return res; return res;
} }