Todd Lipcon created HADOOP-15550:
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Summary: Avoid static initialization of ObjectMappers
Key: HADOOP-15550
URL: https://issues.apache.org/jira/browse/HADOOP-15550
Project: Hadoop Common
Issue Type: Bug
Components: performance
Affects Versions: 3.2.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Various classes statically initialize an ObjectMapper READER instance. This
ends up doing a bunch of class-loading of Jackson libraries that can add up to
a fair amount of CPU, even if the reader ends up not being used. This is
particularly the case with WebHdfsFileSystem, which is class-loaded by a
serviceloader even when unused in a particular job. We should lazy-init these
members instead of doing so as a static class member.
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