[jira] Updated: (HDFS-642) Support pipeline close and close recovery

["Hairong Kuang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang updated HDFS-642:
-------------------------------

    Attachment: closePipeline.patch

A patch for review. It additionally has another change:
A block receiver moves a packet to the ack queue before the received data is flushed to the disk. This means that a packet may be acked bfore its data is on disk.

> Support pipeline close and close recovery
> -----------------------------------------
>
>                 Key: HDFS-642
>                 URL: https://issues.apache.org/jira/browse/HDFS-642
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: Append Branch
>
>         Attachments: closePipeline.patch
>
>
> This jira intends to implement the third stage of block construction: close. The main ideas are:
> 1. A client notifies the datanodes in the pipeline to finalize a replica and then shuts down the pipeline by sending a special end-of-block message.
> 2. The end-of-block message does not get sent until the client finishes sending all packets belong to the block and have received all their acks.
> 3. If close fails, the client recovers the failures by setting up a new pipeline with the remaining datanodes and a newer generation stamp.
> 4. I plan to use an empty packet as the end-of-block message.

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