[GitHub] [hudi] n3nash commented on a change in pull request #2542: [WIP] Global consistency

[GitBox <gi...@apache.org>]

n3nash commented on a change in pull request #2542:
URL: https://github.com/apache/hudi/pull/2542#discussion_r645797595



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File path: hudi-common/src/main/java/org/apache/hudi/common/table/HoodieTableGloballyConsistentMetaClient.java
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@@ -0,0 +1,114 @@
+/*
+ * 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.table;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hudi.common.fs.ConsistencyGuardConfig;
+import org.apache.hudi.common.table.timeline.versioning.TimelineLayoutVersion;
+import org.apache.hudi.common.table.timeline.HoodieTimeline;
+import org.apache.hudi.common.table.timeline.HoodieInstant;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.common.util.StringUtils;
+import org.apache.hudi.exception.TableNotFoundException;
+import org.apache.log4j.LogManager;
+import org.apache.log4j.Logger;
+
+/*
+ * Uber specific version of HoodieTableMetaClient to make sure when a table level property is set
+ * to indicate a commit timestamp that is present across DC make sure to limit the local .hoodie
+ * timeline to upto that commit timestamp.
+ *
+ * Note: There is an assumption that this means every other commit
+ * that is present upto this commit is present globally. This assumption makes it easier to just
+ * trim the commit timeline at the head. Otherwise we will have to store the valid commit timeline
+ * in the table as a property.
+ *
+ * Note: This object should not be cached between mapreduce jobs since the jobConf can change
+ */
+public class HoodieTableGloballyConsistentMetaClient extends HoodieTableMetaClient {

Review comment:
       +1




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