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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8517) Fix a decoding issue in stripped block recovering in client side
Date Tue, 02 Jun 2015 22:19:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569862#comment-14569862

Kai Zheng commented on HDFS-8517:

Thanks [~zhz] for the review, and [~jingzhao] for the great update! The latest patch looks
good to me too.
bq. I think we discussed this before, but could you remind me why we need put parity data
Sure. The parity units first order originates from HDFS-RAID and is not easy to be changed
IMO per our need as the order required to call relevant functions in {{GaliosField}}. In HADOOP-12041
I will get rid of the limit and adjust the order in HADOOP-12040. The effort isn't trivial
so for now we still use the existing order. 

> Fix a decoding issue in stripped block recovering in client side
> ----------------------------------------------------------------
>                 Key: HDFS-8517
>                 URL: https://issues.apache.org/jira/browse/HDFS-8517
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HDFS-8517-HDFS-7285-v1.patch, HDFS-8517-HDFS-7285.v2.patch
> [~jingzhao] reported a decoding issue in HDFS-8481 in the comment copied below:
> bq. While debugging HDFS-8319, I just found that in TestWriteReadStripedFile#testWritePreadWithDNFailure,
if we change the startOffsetInFile from cellSize * 5 to 0, the test fails with the following
error msg:
> {noformat}
> java.lang.AssertionError: Byte at 524288 should be the same expected:<27> but was:<-9>
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.failNotEquals(Assert.java:743)
> 	at org.junit.Assert.assertEquals(Assert.java:118)
> 	at org.junit.Assert.assertEquals(Assert.java:555)
> 	at org.apache.hadoop.hdfs.TestWriteReadStripedFile.testWritePreadWithDNFailure(TestWriteReadStripedFile.java:390)
> {noformat}

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