HA: Standby NN takes a long time to recover from a dead DN starting up
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Key: HDFS-2795
URL: https://issues.apache.org/jira/browse/HDFS-2795
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node, ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Priority: Critical
To reproduce:
# Start an HA cluster with a DN.
# Write several blocks to the FS with replication 1.
# Shutdown the DN
# Wait for the NNs to declare the DN dead. All blocks will be under-replicated.
# Restart the DN.
Note that upon restarting the DN, the active NN will immediately get all block
locations from the initial BR. The standby NN will not, and instead will slowly
add block locations for a subset of the previously-missing blocks on every DN
heartbeat.
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