HDFS 20 append: Lightweight NameNode operations to trigger lease recovery
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Key: HDFS-1520
URL: https://issues.apache.org/jira/browse/HDFS-1520
Project: Hadoop HDFS
Issue Type: New Feature
Affects Versions: 0.20-append
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.20-append
Currently HBase uses append to trigger the close of HLog during Hlog split.
Append is a very expensive operation, which involves not only NameNode
operations but creating a writing pipeline. If one of datanodes on the pipeline
has a problem, this recovery may takes minutes. I'd like implement a
lightweight NameNode operation to trigger lease recovery and make HBase to use
this instead.
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