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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8033) Erasure coding: stateful (non-positional) read from files in striped layout
Date Wed, 22 Apr 2015 20:40:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-8033:
----------------------------
    Attachment: HDFS-8033.002.patch

Thanks Yi for the discussion.

This new patch makes the following main changes based on the previous one:
# Maintains a {{currentNodes}} array, recording the list of DNs hosting the current block
group
# Overrides {{readWithStrategy}} instead of {{readBuffer}}. 
# Adds logic in extended {{readWithStrategy}} to cross cell boundary in a single read() call.
Note that it still tries to drain existing buffers in {{blockReaders}} without trying to {{readFully}}
from them.
# Handles retries for encryption key and token
# Updates the test to read through entire file, which has 2 block groups. This verifies that
the extended {{blockSeekTo}} takes care of proceeding to the next block group
# Changed {{DFSInputStream#closeCurrentBlockReader}} to {{closeCurrentBlockReaders}}

> Erasure coding: stateful (non-positional) read from files in striped layout
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-8033
>                 URL: https://issues.apache.org/jira/browse/HDFS-8033
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-8033.000.patch, HDFS-8033.001.patch, HDFS-8033.002.patch
>
>




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