Andrew Wang created HDFS-11090:
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Summary: Leave safemode immediately if all blocks have reported in
Key: HDFS-11090
URL: https://issues.apache.org/jira/browse/HDFS-11090
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 2.7.3
Reporter: Andrew Wang
Startup safemode is triggered by two thresholds: % blocks reported in, and min
# datanodes. It's extended by an interval (default 30s) until these two
thresholds are met.
Safemode extension is helpful when the cluster has data, and the default %
blocks threshold (0.99) is used. It gives DNs a little extra time to report in
and thus avoid unnecessary replication work.
However, we can leave startup safemode early if 100% of blocks have reported in.
Note that operators sometimes change the % blocks threshold to > 1 to never
automatically leave safemode. We should maintain this behavior.
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