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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13017) Implementations of InputStream.read(buffer, offset, bytes) to exit 0 if bytes==0
Date Tue, 28 Feb 2017 17:25:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-13017:
------------------------------------
    Component/s: fs

> Implementations of InputStream.read(buffer, offset, bytes) to exit 0 if bytes==0
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-13017
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13017
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, io
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>             Fix For: 2.8.0
>
>         Attachments: HADOOP-13017-002.patch, HDFS-13017-001.patch
>
>
> HDFS-10277 showed that HDFS was return -1 on read(buf[], 0, 0) when there was no data
left in the stream; Java IO says 
> bq. If {{len}} is zero, then no bytes are read and {{0}} is returned; otherwise, there
is an attempt to read at least one byte.
> Review the implementations of {{IOStream.(buffer, offset, bytes)} and, where necessary
and considered safe, add a fast exit if the length is 0.



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