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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8233) Fix DFSStripedOutputStream#getCurrentBlockGroupBytes when the last stripe is at the block group boundary
Date Thu, 23 Apr 2015 22:15:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-8233:
----------------------------
    Attachment: hdfs8233-HDFS-7285.000.patch

When we call {{getCurrentBlockGroupBytes}}, the block object in each streamer cannot reflect
the real size since we cannot guarantee that all the packets have been sent out and acks have
also been received. The {{bytesCurBlock}} field can be set to 0 when an internal block is
full. Thus it is hard to compute the accurate block size at this time. However, for {{writeParityCellsForLastStripe}}
what we need is only the parity cell size which can be computed based on {{bytesCurBlock}}.

The 000 patch fixes the issue based on the above theory. It also adds a new unit test case
which fails with original code.

> Fix DFSStripedOutputStream#getCurrentBlockGroupBytes when the last stripe is at the block
group boundary
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-8233
>                 URL: https://issues.apache.org/jira/browse/HDFS-8233
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: hdfs8233-HDFS-7285.000.patch
>
>
> Currently {{DFSStripedOutputStream#getCurrentBlockGroupBytes}} simply uses {{getBytesCurBlock}}
of each streamer to calculate the block group size. This is wrong when the last stripe is
at the block group boundary, since the {{bytesCurBlock}} is set to 0 if an internal block
is finished. 



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