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Reduce the ExitUtil synchronized block scopes so System.exit and Runtime.halt calls aren't within their boundaries, so ExitUtil wrappers do not block each other. Enlarged catches to all Throwables (not just Exceptions). Contributed by Remi Catherinot
HADOOP-17968 Migrate checkstyle module illegalimport to maven enforcer banned-illegal-imports (#3584)
HADOOP-18294. Ensure build folder exists before writing checksum file.ProtocRunner#writeChecksums (#4446)
HADOOP-15789. DistCp does not clean staging folder if class extends DistCp. Contributed by Lawrence Andrews. (#4534)
HADOOP-17234. Add .asf.yaml to allow Github to Jira integration. (#2253). Contributed by Ayush Saxena.
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