SBN should not mark blocks under-replicated when exiting safemode
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Key: HDFS-2804
URL: https://issues.apache.org/jira/browse/HDFS-2804
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
In testing on a cluster, I restarted with one fewer datanodes than previously.
This caused a few thousand blocks to be under-replicated. Similar to HDFS-2795,
I saw the under-replicated blocks on the SBN, slowly decreasing as the
replication thread ran. This seems to be because we process the replication
queue when exiting safemode, even if in standby mode. It also reports many
"missing blocks" in the NN UI which are slowly decreasing.
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