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From anew <...@git.apache.org>
Subject [GitHub] incubator-tephra pull request #20: Compute global prune upper bound using co...
Date Tue, 29 Nov 2016 04:34:16 GMT
Github user anew commented on a diff in the pull request:

    https://github.com/apache/incubator-tephra/pull/20#discussion_r89938559
  
    --- 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
    +   */
    +  long fetchPruneUpperBound(long time, long pruneUpperBoundForTime) throws IOException;
    +
    +  /**
    +   * Called after pruning the invalid list.
    +   * The plugin can use the pruneUpperBound passed to clean up its state
    --- End diff --
    
    is this the same pruneUpperBound that was returned by fetchPruneUpperBound? What is the
semantic of this - does it mean it is guaranteed that all invalid transactions less than that
upper bound have been removed from the invalid list?


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