Todd Lipcon created HADOOP-8406:
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Summary: 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
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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