iamcaoxudong commented on a change in pull request #1700: HDFS-14963. Add HDFS
Client machine caching active namenode index mechanism.
URL: https://github.com/apache/hadoop/pull/1700#discussion_r351762620
##########
File path:
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.java
##########
@@ -93,4 +109,65 @@ public synchronized void close() throws IOException {
public boolean useLogicalURI() {
return true;
}
+
+ /**
+ * Write active NameNode index to cache file.
+ */
+ public void writeActiveCache(int index) {
+ if (!cacheActiveEnabled) {
+ return;
+ }
+
+ synchronized (cacheActiveFile) {
+ boolean exist = cacheActiveFile.exists();
+ try (RandomAccessFile raf = new RandomAccessFile(cacheActiveFile, "rw");
+ FileChannel fc = raf.getChannel();
+ FileLock lock = fc.tryLock(0, Long.MAX_VALUE, false)) {
Review comment:
Yes, according to my tests, after a process ends, the linux kernel releases
all resources it holds, including locks.
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