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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_r89938969
  
    --- Diff: tephra-hbase-compat-1.1-base/src/main/java/org/apache/tephra/hbase/coprocessor/janitor/DefaultDataJanitorPlugin.java
---
    @@ -0,0 +1,189 @@
    +/*
    + * 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.hbase.coprocessor.janitor;
    +
    +import com.google.common.base.Function;
    +import com.google.common.collect.Iterables;
    +import com.google.common.collect.Maps;
    +import com.google.common.collect.Sets;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.hbase.HRegionInfo;
    +import org.apache.hadoop.hbase.HTableDescriptor;
    +import org.apache.hadoop.hbase.TableName;
    +import org.apache.hadoop.hbase.client.Admin;
    +import org.apache.hadoop.hbase.client.Connection;
    +import org.apache.hadoop.hbase.client.ConnectionFactory;
    +import org.apache.hadoop.hbase.client.Table;
    +import org.apache.hadoop.hbase.util.Bytes;
    +import org.apache.tephra.TxConstants;
    +import org.apache.tephra.hbase.coprocessor.TransactionProcessor;
    +import org.apache.tephra.janitor.DataJanitorPlugin;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +import java.util.Collections;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.SortedSet;
    +import java.util.TreeSet;
    +
    +/**
    + * Default implementation of the {@link DataJanitorPlugin} for HBase
    + */
    +@SuppressWarnings("WeakerAccess")
    +public class DefaultDataJanitorPlugin implements DataJanitorPlugin {
    +  public static final Logger LOG = LoggerFactory.getLogger(DefaultDataJanitorPlugin.class);
    +
    +  protected Configuration conf;
    +  protected Connection connection;
    +  protected DataJanitorState dataJanitorState;
    +
    +  @Override
    +  public void initialize(Configuration conf) throws IOException {
    +    this.conf = conf;
    +    this.connection = ConnectionFactory.createConnection(conf);
    +
    +    final TableName stateTable = TableName.valueOf(conf.get(TxConstants.DataJanitor.PRUNE_STATE_TABLE,
    +                                                            TxConstants.DataJanitor.DEFAULT_PRUNE_STATE_TABLE));
    +    LOG.info("Initializing plugin with state table {}", stateTable.getNameWithNamespaceInclAsString());
    +    this.dataJanitorState = new DataJanitorState(new DataJanitorState.TableSupplier()
{
    +      @Override
    +      public Table get() throws IOException {
    +        return connection.getTable(stateTable);
    +      }
    +    });
    +  }
    +
    +  @Override
    +  public long fetchPruneUpperBound(long time, long pruneUpperBoundForTime) throws IOException
{
    +    LOG.debug("Fetching prune upper bound for time {} and max prune upper bound {}",
time, pruneUpperBoundForTime);
    +    if (time < 0 || pruneUpperBoundForTime < 0) {
    +      return -1;
    +    }
    +
    +    SortedSet<byte[]> transactionalRegions = getTransactionalRegions();
    +    if (!transactionalRegions.isEmpty()) {
    +      LOG.debug("Saving {} transactional regions for time {}", transactionalRegions.size(),
time);
    +      dataJanitorState.saveRegionsForTime(time, transactionalRegions);
    --- End diff --
    
    I am not sure I understand. Why does fetch() have to save anything? Shouldn't it just
read (=fetch)?


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