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https://issues.apache.org/jira/browse/HADOOP-18671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714754#comment-17714754
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ASF GitHub Bot commented on HADOOP-18671:
-----------------------------------------
jojochuang commented on code in PR #5553:
URL: https://github.com/apache/hadoop/pull/5553#discussion_r1173086055
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/LeaseRecoverable.java:
##########
@@ -0,0 +1,39 @@
+/*
+ * 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.hadoop.fs;
+
+import java.io.IOException;
+
+/**
+ * Whether the given Path of the FileSystem has the capability to performance
+ * lease recovery.
+ */
+public interface LeaseRecoverable {
+
+ /**
+ * Start the lease recovery of a file
+ *
+ * @param file path to a file
+ * @return true if the file is already closed, and it does not require lease
recovery
+ * @throws IOException if an error occurs during lease recovery
+ */
+ default boolean recoverLease(Path file) throws IOException {
+ throw new IOException("This file system does not support lease recovery
for Path " + file);
Review Comment:
IMO recoverLease() and isFileClosed() should go together in the same
interface.
The recoverLease() kicks of lease recover but does not say it's completed.
User's supposed to use isFileClosed() to check if the file is closed (meaning
lease recovered)
> Add recoverLease(), setSafeMode(), isFileClosed() APIs to FileSystem
> --------------------------------------------------------------------
>
> Key: HADOOP-18671
> URL: https://issues.apache.org/jira/browse/HADOOP-18671
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
>
> We are in the midst of enabling HBase and Solr to run on Ozone.
> An obstacle is that HBase relies heavily on HDFS APIs and semantics for its
> Write Ahead Log (WAL) file (similarly, for Solr's transaction log). We
> propose to push up these HDFS APIs, i.e. recoverLease(), setSafeMode(),
> isFileClosed() to FileSystem abstraction so that HBase and other applications
> do not need to take on Ozone dependency at compile time. This work will
> (hopefully) enable HBase to run on other storage system implementations in
> the future.
> There are other HDFS features that HBase uses, including hedged read and
> favored nodes. Those are FS-specific optimizations and are not critical to
> enable HBase on Ozone.
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