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https://issues.apache.org/jira/browse/HDFS-14792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-14792:
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Description:
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 stay 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 DN replicas are reported.
was:
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.
> [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
> Priority: Major
>
> 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 stay 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 DN replicas are reported.
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