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From keith-turner <...@git.apache.org>
Subject [GitHub] accumulo pull request #135: ACCUMULO-1787: created TwoTierCompactionStrategy...
Date Tue, 06 Sep 2016 18:09:20 GMT
Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/135#discussion_r77688357
  
    --- Diff: docs/src/main/resources/examples/README.compactionStrategy ---
    @@ -0,0 +1,60 @@
    +Title: Apache Accumulo Customizing the Compaction Strategy 
    +Notice:    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.
    +
    +This tutorial uses the following Java classes, which can be found in org.apache.accumulo.tserver.compaction:

    +
    + * DefaultCompactionStrategy.java - determines which files to compact based on table.compaction.major.ratio
and table.file.max
    + * EverythingCompactionStrategy.java - compacts all files
    + * SizeLimitCompactionStrategy.java - compacts files no bigger than table.majc.compaction.strategy.opts.sizeLimit
    + * TwoTierCompactionStrategy.java - uses default compression for smaller files and table.majc.compaction.strategy.opts.file.large.compress.type
for larger files
    +
    +This is an example of how to configure a compaction strategy. By default Accumulo will
always use the DefaultCompactionStrategy, unless 
    +these steps are taken to change the configuration.  Use the strategy and settings that
best fits your Accumulo setup.
    +
    +The command below sets the compression for smaller files and minor compactions.
    --- End diff --
    
    The 4 config commands below are at the system level, so the settings would apply to all
tables.  I think an example should show doing this at the table level.  Could create the table
and then set the four configuration params for the table.


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