Lukas Majercak created HDFS-11288:
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Summary: Manually allow block replication/deletion in Safe Mode
Key: HDFS-11288
URL: https://issues.apache.org/jira/browse/HDFS-11288
Project: Hadoop HDFS
Issue Type: New Feature
Components: namenode
Affects Versions: 3.0.0-alpha1
Reporter: Lukas Majercak
Currently, the Safe Mode does not allow block replication/deletion, which makes
sense, especially on startup, as we do not want to replicate blocks
unnecessarily.
An issue we have seen in our clusters though, is when the NameNode is getting
overwhelmed with the amounts of needed replications; in which case, we would
like to be able to manually set the NN to be in a state in which R/Ws to FS are
disallowed but the NN continues replicating/deleting blocks.
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