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From "Lukas Majercak (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11288) Manually allow block replication/deletion in Safe Mode
Date Tue, 03 Jan 2017 21:08:58 GMT
Lukas Majercak created HDFS-11288:
-------------------------------------

             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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