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Subject: [jira] [Commented] (HADOOP-8406)
 CompressionCodecFactory.CODEC_PROVIDERS iteration is thread-unsafe
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    [ https://issues.apache.org/jira/browse/HADOOP-8406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13277739#comment-13277739 ] 

Hudson commented on HADOOP-8406:
--------------------------------

Integrated in Hadoop-Hdfs-trunk #1048 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1048/])
    HADOOP-8406. CompressionCodecFactory.CODEC_PROVIDERS iteration is thread-unsafe. Contributed by Todd Lipcon. (Revision 1339476)

     Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1339476
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/CompressionCodecFactory.java

                
> CompressionCodecFactory.CODEC_PROVIDERS iteration is thread-unsafe
> ------------------------------------------------------------------
>
>                 Key: HADOOP-8406
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8406
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 2.0.1
>
>         Attachments: hadoop-8406.txt
>
>
> CompressionCodecFactory defines CODEC_PROVIDERS as:
> {code}
>   private static final ServiceLoader<CompressionCodec> CODEC_PROVIDERS =
>     ServiceLoader.load(CompressionCodec.class);
> {code}
> but this is a lazy collection which is thread-unsafe to iterate. We either need to synchronize when we iterate over it, or we need to materialize it during class-loading time by copying to a non-lazy collection

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