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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HADOOP-15891) Provide Regex Based Mount Point In Inode Tree
Date Wed, 02 Sep 2020 01:54:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15891?focusedWorklogId=477561&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-477561
]

ASF GitHub Bot logged work on HADOOP-15891:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Sep/20 01:53
            Start Date: 02/Sep/20 01:53
    Worklog Time Spent: 10m 
      Work Description: JohnZZGithub commented on a change in pull request #2185:
URL: https://github.com/apache/hadoop/pull/2185#discussion_r481543446



##########
File path: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/RegexMountPointResolvedDstPathReplaceInterceptor.java
##########
@@ -0,0 +1,138 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.viewfs;
+
+import java.io.IOException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.Path;
+
+import static org.apache.hadoop.fs.viewfs.RegexMountPointInterceptorType.REPLACE_RESOLVED_DST_PATH;
+
+/**
+ * Implementation of RegexMountPointResolvedDstPathReplaceInterceptor.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+class RegexMountPointResolvedDstPathReplaceInterceptor
+    implements RegexMountPointInterceptor {
+
+  private String srcRegexString;
+  private String replaceString;
+  private Pattern srcRegexPattern;
+
+  RegexMountPointResolvedDstPathReplaceInterceptor(String srcRegex,
+      String replaceString) {
+    this.srcRegexString = srcRegex;
+    this.replaceString = replaceString;
+    this.srcRegexPattern = null;
+  }
+
+  public String getSrcRegexString() {
+    return srcRegexString;
+  }
+
+  public String getReplaceString() {
+    return replaceString;
+  }
+
+  public Pattern getSrcRegexPattern() {
+    return srcRegexPattern;
+  }
+
+  @Override
+  public void initialize() throws IOException {
+    try {
+      srcRegexPattern = Pattern.compile(srcRegexString);
+    } catch (PatternSyntaxException ex) {
+      throw new IOException(
+          "Initialize interceptor failed, srcRegx:" + srcRegexString, ex);
+    }
+  }
+
+  /**
+   * Intercept source before resolution.
+   *
+   * @param source
+   * @return
+   */
+  @Override
+  public String interceptSource(String source) {
+    return source;
+  }
+
+  /**
+   * Intercept resolved path, e.g.
+   * Mount point /^(\\w+)/, ${1}.hadoop.net
+   * If incoming path is /user1/home/tmp/job1,
+   * then the resolved path str will be user1.
+   *
+   * @return intercepted string
+   */
+  @Override public String interceptResolvedDestPathStr(
+      String parsedDestPathStr) {
+    Matcher matcher = srcRegexPattern.matcher(parsedDestPathStr);
+    return matcher.replaceAll(replaceString);
+  }
+
+  /**
+   * Intercept remaining path.
+   *
+   * @return intercepted path
+   */
+  @Override public Path interceptRemainingPath(Path remainingPath) {

Review comment:
       This is a great question.
   Here's an example: 
   /user/$userName => s3://$userName.apache.org 
   /user/hadoop/dir1/dir2/dir3/file3 will be mapped to s3://user.hadoop.apche.org/dir1/dir2/dir3/file3

   
   interceptSource(/user/hadoop/) take sourcePath and won't know which part will be replaced
in the final path.
   After mapping, the dest will be s3://user.hadoop.apche.org/dir1/dir2/dir3/file3 
   interceptRemainingPath(dir1/dir2/dir3/file3) could enable users to do process the remaining
part (dir1/dir2/dir3/file3) after the mounted path. E.g. take care of bad characters.
   
   But I'm good to remove it if we feel it's cleaner.
   
   
   
   




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 477561)
    Time Spent: 1h 50m  (was: 1h 40m)

> Provide Regex Based Mount Point In Inode Tree
> ---------------------------------------------
>
>                 Key: HADOOP-15891
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15891
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: viewfs
>            Reporter: zhenzhao wang
>            Assignee: zhenzhao wang
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HADOOP-15891.015.patch, HDFS-13948.001.patch, HDFS-13948.002.patch,
HDFS-13948.003.patch, HDFS-13948.004.patch, HDFS-13948.005.patch, HDFS-13948.006.patch, HDFS-13948.007.patch,
HDFS-13948.008.patch, HDFS-13948.009.patch, HDFS-13948.011.patch, HDFS-13948.012.patch, HDFS-13948.013.patch,
HDFS-13948.014.patch, HDFS-13948_ Regex Link Type In Mont Table-V0.pdf, HDFS-13948_ Regex
Link Type In Mount Table-v1.pdf
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> This jira is created to support regex based mount point in Inode Tree. We noticed that
mount point only support fixed target path. However, we might have user cases when target
needs to refer some fields from source. e.g. We might want a mapping of /cluster1/user1 =>
/cluster1-dc1/user-nn-user1, we want to refer `cluster` and `user` field in source to construct
target. It's impossible to archive this with current link type. Though we could set one-to-one
mapping, the mount table would become bloated if we have thousands of users. Besides, a regex
mapping would empower us more flexibility. So we are going to build a regex based mount point
which target could refer groups from src regex mapping. 



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