Konstantin Shvachko created HDFS-14792:
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             Summary: [SBN read] StanbyNode does not come out of safemode while 
adding new blocks.
                 Key: HDFS-14792
                 URL: https://issues.apache.org/jira/browse/HDFS-14792
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
    Affects Versions: 2.10.0
            Reporter: Konstantin Shvachko


During startup StandbyNode reports that it needs additional X blocks to reach 
the threshold 1.0000. Where X is changing up and down.
This is because with fast tailing SBN adds new blocks from edits while DNs have 
not reported replicas yet. Being in SafeMode SBN counts new blocks towards the 
threshold and can stays in SafeMode for a long time.
By design, the purpose of startup SafeMode is to disallow modifications of the 
namespace and blocks map until all DNs replicas are reported.



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