Ming Ma created HDFS-7541:
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Summary: Support for fast HDFS datanode rolling upgrade
Key: HDFS-7541
URL: https://issues.apache.org/jira/browse/HDFS-7541
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Ming Ma
Current HDFS DN rolling upgrade step requires sequential DN restart to minimize
the impact on data availability and read/write operations. The side effect is
longer upgrade duration for large clusters. This might be acceptable for DN JVM
quick restart to update hadoop code/configuration. However, for OS upgrade that
requires machine reboot, the overall upgrade duration will be too long if we
continue to do sequential DN rolling restart.
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