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Date: Thu, 23 Aug 2012 23:11:42 +1100 (NCT)
From: "Kihwal Lee (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3177) Allow DFSClient to find out and use
 the CRC type being used for a file.
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    [ https://issues.apache.org/jira/browse/HDFS-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440229#comment-13440229 ] 

Kihwal Lee commented on HDFS-3177:
----------------------------------

bq. -1 findbugs. The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings.

They are not caused by this patch. Previous builds have the indentical warnings. HDFS-3835 mentions another jora fixing one of the warnings.

{quote}
  -1 core tests. The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:
org.apache.hadoop.hdfs.TestPersistBlocks
{quote}

Not caused by this patch. There already is a jira for this: HDFS-3811
                
> Allow DFSClient to find out and use the CRC type being used for a file.
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3177
>                 URL: https://issues.apache.org/jira/browse/HDFS-3177
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 0.23.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.1.0-alpha, 3.0.0
>
>         Attachments: hdfs-3177-after-hadoop-8239-8240.patch.txt, hdfs-3177-after-hadoop-8239.patch.txt, hdfs-3177-branch2-trunk.patch.txt, hdfs-3177-branch2-trunk.patch.txt, hdfs-3177.patch, hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239-8240.patch.txt, hdfs-3177-with-hadoop-8239.patch.txt
>
>
> To support HADOOP-8060, DFSClient should be able to find out the checksum type being used for files in hdfs.
> In my prototype, DataTransferProtocol was extended to include the checksum type in the blockChecksum() response. DFSClient uses it in getFileChecksum() to determin the checksum type. Also append() can be configured to use the existing checksum type instead of the configured one.

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