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From Charles Lamb <cl...@cloudera.com>
Subject Re: How the ack sent back to upstream of a pipeline when write data to HDFS
Date Fri, 13 Mar 2015 12:27:29 GMT
On 3/13/2015 7:55 AM, xiaohe lan wrote:
> Hi experts,
>
> When HDFS client sends a packet of data to a DN in the pipeline, the packet
> will then be sent to the next DN in the pipeline. What confuses me is when
> the ack from a DN in the pipeline will be sent back ? In which order ? It
> is sent from the last to first or in other ways ?
>
> Thanks,
> Xiaohe
Hi Xiaohe,

Take a look at figure 3.2 in 
https://issues.apache.org/jira/secure/attachment/12445209/appendDesign3.pdf.

IHTH.

Charles


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