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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