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From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request: ACCUMULO-4187: Added rate limiting for majo...
Date Wed, 13 Apr 2016 18:17:41 GMT
Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/90#discussion_r59598295
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/file/FileOperations.java ---
    @@ -55,23 +56,24 @@ public static FileOperations getInstance() {
        */
     
       public abstract FileSKVIterator openReader(String file, Range range, Set<ByteSequence>
columnFamilies, boolean inclusive, FileSystem fs, Configuration conf,
    -      AccumuloConfiguration tableConf) throws IOException;
    +      RateLimiter readLimiter, AccumuloConfiguration tableConf) throws IOException;
     
       public abstract FileSKVIterator openReader(String file, Range range, Set<ByteSequence>
columnFamilies, boolean inclusive, FileSystem fs, Configuration conf,
    -      AccumuloConfiguration tableConf, BlockCache dataCache, BlockCache indexCache) throws
IOException;
    +      RateLimiter readLimiter, AccumuloConfiguration tableConf, BlockCache dataCache,
BlockCache indexCache) throws IOException;
     
       /**
        * Open a reader that fully support seeking and also enable any optimizations related
to seeking, like bloom filters.
        *
        */
     
    -  public abstract FileSKVIterator openReader(String file, boolean seekToBeginning, FileSystem
fs, Configuration conf, AccumuloConfiguration acuconf)
    -      throws IOException;
    +  public abstract FileSKVIterator openReader(String file, boolean seekToBeginning, FileSystem
fs, Configuration conf, RateLimiter readLimiter,
    --- End diff --
    
    > Not sure exactly what you mean, but what I meant was along the lines of creating
a "FileOptions" (or similar) object to pass around instead of the AccumuloConfiguration object
which is narrowly applicable to the context of those utility methods (context: operations
on files?), and which is composed of the relevant configs from wherever they are sourced.
    
    Something like:
    ```
    T impl = acuConf.getImpl(Property.MY_FACTORY_IMPLEMENTATION);
    ```
    Concretely:
    ```
    RATE_LIMITER_FACTORY("tserver.rate.limiter.factory", SharedRateLimiterFactory.class, PropertyType.IMPL,
"...")
    ```
    ```
    RateLimiterFactory factory = acuConf.getImpl(Property.RATE_LIMITER_FACTORY);
    ```


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