/**
* Acquires, then releases, all {@code write.lock} files in the given shard paths. The
* "write.lock" file is assumed to be under the shard path's "index" directory as used by
* Elasticsearch.
*
* @throws LockObtainFailedException if any of the locks could not be acquired
*/
public static void acquireFSLockForPaths(IndexSettings indexSettings, Path... shardPaths)
throws IOException {
Lock[] locks = new Lock[shardPaths.length];
Directory[] dirs = new Directory[shardPaths.length];
try {
for (int i = 0; i < shardPaths.length; i++) {
// resolve the directory the shard actually lives in
Path p = shardPaths[i].resolve("index");
// open a directory (will be immediately closed) on the shard's location
dirs[i] =
new SimpleFSDirectory(
p, indexSettings.getValue(FsDirectoryService.INDEX_LOCK_FACTOR_SETTING));
// create a lock for the "write.lock" file
try {
locks[i] = dirs[i].obtainLock(IndexWriter.WRITE_LOCK_NAME);
} catch (IOException ex) {
throw new LockObtainFailedException(
"unable to acquire " + IndexWriter.WRITE_LOCK_NAME + " for " + p, ex);
}
}
} finally {
IOUtils.closeWhileHandlingException(locks);
IOUtils.closeWhileHandlingException(dirs);
}
}