Github user anew commented on a diff in the pull request:
https://github.com/apache/incubator-tephra/pull/20#discussion_r89938407
--- Diff:
tephra-core/src/main/java/org/apache/tephra/janitor/DataJanitorPlugin.java ---
@@ -0,0 +1,59 @@
+/*
+ * 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.tephra.janitor;
+
+import org.apache.hadoop.conf.Configuration;
+
+import java.io.IOException;
+
+/**
+ * Data janitor interface to manage the invalid transaction list.
+ * There will be one such plugin per data store that will be invoked
periodically
+ * to fetch the prune upper bound for each data store.
+ * Invalid transaction list will pruned up to the minimum of prune upper
bounds returned by all the plugins.
+ */
+public interface DataJanitorPlugin {
+ /**
+ * Called once at the beginning to initialize the plugin
+ */
+ void initialize(Configuration conf) throws IOException;
+
+ /**
+ * Called periodically to fetch prune upper bound for a data store
+ *
+ * @param time start time of this prune iteration
+ * @param pruneUpperBoundForTime upper bound for prune tx id for the
given start time
--- End diff --
this is confusing. I thought this _returns_ the prune upper bound? Why does
it need the upper bound passed in as a parameter. I think you need to explain
better what this parameter means.
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