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Posted to hdfs-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2015/04/07 20:30:12 UTC

[jira] [Updated] (HDFS-8076) Code cleanup for DFSInputStream: use offset instead of LocatedBlock when possible

     [ https://issues.apache.org/jira/browse/HDFS-8076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhe Zhang updated HDFS-8076:
----------------------------
    Status: Patch Available  (was: Open)

> Code cleanup for DFSInputStream: use offset instead of LocatedBlock when possible
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-8076
>                 URL: https://issues.apache.org/jira/browse/HDFS-8076
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-8076-000.patch
>
>
> This JIRA aims to refactor the signatures {{fetchBlockByteRange}} and {{actualGetFromOneDataNode}}. Instead of taking a {{LocatedBlock}}, I think they should just take the starting offset of that block, since they'll later call {{getBlockAt}} to refresh the location anyway. I think we should make it clear so the callers are not surprised if the finally used {{LocatedBlock}} is not the one they passed in. 



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