Make lease expiration limit configurable
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Key: HDFS-1429
URL: https://issues.apache.org/jira/browse/HDFS-1429
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.22.0
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
Currently the soft lease expiration limit is hardcoded as 1 min and the hard
limit is hardcoded to be 1 hour. I'd like to make these two values to be
configurable. This would allow applications with real-time requirements to set
the limits that satisfy their needs.
For most HDFS clusters that do not need to serve real-time applications, this
change allows it to set the soft limit to be a much larger number (like
equivalent to the hard limit). This will make the lease renewable thread at the
client side to renew lease much less frequently since the renewable interval is
set to be half of the soft limit. This will greatly reduce the amount of
traffic caused by lease renewable when there are large number of clients
writing to HDFS simultaneously.
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