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https://issues.apache.org/jira/browse/HDFS-1833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019438#comment-13019438
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Tsz Wo (Nicholas), SZE commented on HDFS-1833:
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Hi Daryn, {{downstreams}} is the replacement of {{numTargets}}, where the
values of {{numTargets}} could be -1, 0 or >0, where the value -1 is used for
verifying check sum locally but not write pipe line. In the patch,
{{downstreams == null}} is for the case {{numTargets == -1}}.
I got [similar questions from
Jitendra|https://issues.apache.org/jira/browse/HDFS-1789?focusedCommentId=13012284&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13012284]
earlier. It probably is still confusing. Let me think about how to make it
more clear.
> Refactor BlockReceiver
> ----------------------
>
> Key: HDFS-1833
> URL: https://issues.apache.org/jira/browse/HDFS-1833
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: h1833_20110412.patch
>
>
> There are repeated codes for creating log/error messages in BlockReceiver.
> Also, some comment in the codes are incorrect, e.g.
> {code}
> private int numTargets; // number of downstream datanodes including myself
> {code}
> but the count indeed excludes the current datanode.
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