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From madrob <...@git.apache.org>
Subject [GitHub] accumulo pull request: ACCUMULO-4153: Update the getCodec method t...
Date Wed, 24 Feb 2016 22:50:26 GMT
Github user madrob commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/73#discussion_r54021185
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/file/rfile/bcfile/Compression.java
---
    @@ -147,25 +148,27 @@ public synchronized OutputStream createCompressionStream(OutputStream
downStream
         },
     
         GZ(COMPRESSION_GZ) {
    -      private transient DefaultCodec codec;
    +      private transient AtomicReference<DefaultCodec> codec = new AtomicReference<DefaultCodec>();
     
           @Override
    -      synchronized CompressionCodec getCodec() {
    -        if (codec == null) {
    -          codec = new DefaultCodec();
    -          codec.setConf(conf);
    +      CompressionCodec getCodec() {
    +        DefaultCodec resultCodec = codec.get();
    +        if (null == resultCodec) {
    +          DefaultCodec newCodec = new DefaultCodec();
    --- End diff --
    
    The merit of creating it at construction time depends on how costly the initialization
is. I'm under the impression that it's not _that_ bad, so eager initialization is probably
ok here and we don't have to worry about concurrency at all. Good point, @brianloss.


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