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From keith-turner <...@git.apache.org>
Subject [GitHub] accumulo pull request #180: Taking a crack at new summarization API
Date Mon, 05 Dec 2016 23:26:37 GMT
Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/180#discussion_r90980177
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/client/admin/SummaryRetriever.java
---
    @@ -0,0 +1,46 @@
    +/*
    + * 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.accumulo.core.client.admin;
    +
    +import java.util.Map;
    +
    +import org.apache.hadoop.io.Text;
    +
    +public interface SummaryRetriever {
    +
    +  /**
    +   * Allows optionally setting start row before retrieving data.
    +   */
    +  SummaryRetriever start(Text startRow);
    --- End diff --
    
    @joshelser I created something called SummaryStore in ab8deb7.  It generates ~10 summaries
for input data without knowing how many keys will be added beforhand.  Uses the approach I
mentioned above of merging summaries.  One additional step I discovered I needed to do was
double the number of key/vals per summary each time I merged.
    
    So if I have 10 summaries each covering 1000 keys, when I merge to 5 then each of those
represents 2000 keys.  So now I want start adding summaries every 2000 keys.  Next time I
merge, I will start adding summaries every 4000 keys... etc.


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