Change block write protocol to support pipeline recovery
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Key: HDFS-589
URL: https://issues.apache.org/jira/browse/HDFS-589
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: Append Branch
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: Append Branch
Current block write operation's header has the following fields:
blockId blockGS pipelineSize isRecovery clientName hasSource source
#datanodesInDownStreamPipeline downstreamDatanodes
I'd like to change the header to be
blockId blockGS pipelineSize clientName flags blockMinLen blockMaxLen newGS
hasSource source #datanodesInDownStreamPipeline downstreamDatanodes
With this protocol change, pipeline recovery will be performed when a mew
pipeline is set up.
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