Zhe Zhang created HDFS-9119:
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Summary: Discrepancy between edit log tailing interval and RPC
timeout for transitionToActive
Key: HDFS-9119
URL: https://issues.apache.org/jira/browse/HDFS-9119
Project: Hadoop HDFS
Issue Type: Bug
Components: ha
Affects Versions: 2.7.1
Reporter: Zhe Zhang
{{EditLogTailer}} on standby NameNode tails edits from active NameNode every 2
minutes. But the {{transitionToActive}} RPC call has a timeout of 1 minute.
If active NameNode encounters very intensive metadata workload (in particular,
a lot of {{AddOp}} and {{MkDir}} operations to create new files and
directories), the amount of updates accumulated in the 2 mins edit log tailing
interval is hard for the standby NameNode to catch up in the 1 min timeout
window. If that happens, the FailoverController will timeout and give up trying
to transition the standby to active. The old ANN will resume adding more edits.
When the SbNN finally finishes catching up the edits and tries to become
active, it will crash.
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