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https://issues.apache.org/jira/browse/HUDI-2098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377458#comment-17377458
]
ASF GitHub Bot commented on HUDI-2098:
--------------------------------------
n3nash commented on a change in pull request #3189:
URL: https://github.com/apache/hudi/pull/3189#discussion_r666296765
##########
File path:
hudi-common/src/main/java/org/apache/hudi/common/lock/HdfsFileLockProvider.java
##########
@@ -0,0 +1,125 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hudi.common.lock;
+
+import org.apache.hudi.common.config.LockConfiguration;
+import org.apache.hudi.common.fs.FSUtils;
+import org.apache.hudi.common.util.StringUtils;
+import org.apache.hudi.exception.HoodieLockException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.FsAction;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A file based lock. This {@link LockProvider} implementation allows to lock
table operations using HDFS
+ * This is achieved by using the concept of acquiring the data out stream
using Append option.
+ */
+public class HdfsFileLockProvider implements LockProvider<String> {
+ private static final Logger LOG =
LogManager.getLogger(HdfsFileLockProvider.class);
+
+ private String lockDir;
+ private FileSystem fs;
+ protected LockConfiguration lockConfiguration;
+ private DataOutputStream dataOutputStream;
+ private String lockFile;
+
+ public HdfsFileLockProvider(final LockConfiguration lockConfiguration, final
Configuration conf) {
+ this.lockConfiguration = lockConfiguration;
+ this.lockDir =
lockConfiguration.getConfig().getString(LockConfiguration.FILESYSTEM_LOCK_PATH_PROP_KEY);
+ this.fs = FSUtils.getFs(lockDir, conf);
+ this.lockFile = new Path(lockDir, "lockFile").toUri().toString();
+ }
+
+ @Override
+ public boolean tryLock(long time, TimeUnit unit) {
+ try {
+ int retryCount =
lockConfiguration.getConfig().getInteger(LockConfiguration.LOCK_ACQUIRE_NUM_RETRIES_PROP_KEY);
+ int retryTimeout =
lockConfiguration.getConfig().getInteger(LockConfiguration.LOCK_ACQUIRE_RETRY_WAIT_TIME_IN_MILLIS_PROP_KEY);
+ for (int i = 0; i < retryCount; i++) {
+ if (acquireLock()) {
+ LOG.info(generateLogStatement(LockState.ACQUIRED,
generateLogSuffixString()));
+ return true;
+ } else {
+ Thread.sleep(retryTimeout);
+ }
+ }
+ } catch (InterruptedException e) {
+ throw new HoodieLockException("Failed to acquire file lock", e);
+ }
+ return false;
+ }
+
+ @Override
+ public void unlock() {
+ LOG.info(generateLogStatement(LockState.RELEASING,
generateLogSuffixString()));
+ if (dataOutputStream != null) {
+ try {
+ dataOutputStream.close();
+ dataOutputStream = null;
+ } catch (IOException e) {
+ LOG.error(generateLogStatement(LockState.FAILED_TO_RELEASE,
generateLogSuffixString()));
+ throw new
HoodieLockException(generateLogStatement(LockState.FAILED_TO_RELEASE,
generateLogSuffixString()), e);
+ }
+ }
+ LOG.info(generateLogStatement(LockState.RELEASED,
generateLogSuffixString()));
+ }
+
+ private boolean acquireLock() {
+ if (lockDir == null || lockFile == null) {
+ return false;
+ }
+ try {
+ Path lockPath = new Path(lockDir);
+ Path lockFilePath = new Path(lockFile);
+ if (!fs.exists(lockPath)) {
+ fs.mkdirs(lockPath);
+ }
+ if (!fs.exists(lockFilePath)) {
+ // Pass the permissions during file creation itself
+ fs.create(lockFilePath, new FsPermission(FsAction.ALL, FsAction.ALL,
FsAction.ALL),
Review comment:
Why do we need to pass permissions ?
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> add Hdfs file lock for HUDI
> ---------------------------
>
> Key: HUDI-2098
> URL: https://issues.apache.org/jira/browse/HUDI-2098
> Project: Apache Hudi
> Issue Type: Bug
> Components: Usability
> Affects Versions: 0.8.0
> Environment: spark3.1.1
> hive3.1.1
> hadoop3.1.1
> Reporter: tao meng
> Assignee: tao meng
> Priority: Minor
> Labels: features, pull-request-available
> Fix For: 0.9.0
>
>
> now hudi support hive/zk lock for concurrency write, we introduce a new lock
> type hdfs lock
>
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