Felix N created HDFS-17924:
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Summary: Improve NameNode edit log rolling controls
Key: HDFS-17924
URL: https://issues.apache.org/jira/browse/HDFS-17924
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Felix N
Assignee: Felix N
Currently, all 3 kinds of NNs trigger rollEditLog at some time interval and
based on the number of edits using a threshold check.
If a subcluster has a lot of observers, active can roll very frequently, up to
dozens of times per hour. This ticket aims improve that via 2 configurable
features:
* Only active should perform rollEditLog periodically, and it should guarantee
a roll as long as there's something to roll, at a reasonable interval.
* Standby and observer NNs can opt out of sending rollEditLog.
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