HA: Tests and fixes for pipeline targets and replica recovery
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Key: HDFS-2691
URL: https://issues.apache.org/jira/browse/HDFS-2691
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: HA branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Critical
Currently there are some TODOs around pipeline/recovery code in the HA branch.
For example, commitBlockSynchronization only gets sent to the active NN which
may have failed over by that point. So, we need to write some tests here and
figure out what the correct behavior is.
Another related area is the treatment of targets in the pipeline. When a
pipeline is created, the active NN adds the "expected locations" to the
BlockInfoUnderConstruction, but the DN identifiers aren't logged with the
OP_ADD. So after a failover, the BlockInfoUnderConstruction will have no
targets and I imagine replica recovery would probably trigger some issues.
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