[HDFS-589] Change block write protocol to support pipeline recovery

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Append Branch
• Fix Version/s: Append Branch
• Component/s: datanode, hdfs-client
• Hadoop Flags: Reviewed
• Assignee: Hairong Kuang
• Reporter: Hairong Kuang
• Created: 02/Sep/09 18:40
• Updated: 14/Sep/09 23:37
• Resolved: 14/Sep/09 23:37

Description

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.