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https://issues.apache.org/jira/browse/HDFS-8744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623112#comment-14623112
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Jing Zhao commented on HDFS-8744:
---------------------------------
But I think this is the format of the current packet:
{code}
/**
* buf is pointed into like follows:
* (C is checksum data, D is payload data)
*
* [_________CCCCCCCCC________________DDDDDDDDDDDDDDDD___]
* ^ ^ ^ ^
* | checksumPos dataStart dataPos
* checksumStart
*
* Right before sending, we move the checksum data to immediately precede
* the actual data, and then insert the header into the buffer immediately
* preceding the checksum data, so we make sure to keep enough space in
* front of the checksum data to support the largest conceivable header.
*/
{code}
> Erasure Coding: the number of chunks in packet is not updated when writing
> parity data
> --------------------------------------------------------------------------------------
>
> Key: HDFS-8744
> URL: https://issues.apache.org/jira/browse/HDFS-8744
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Li Bo
> Assignee: Li Bo
> Attachments: HDFS-8744-HDFS-7285-001.patch,
> HDFS-8744-HDFS-7285-002.patch
>
>
> The member {{numChunks}} in {{DFSPacket}} is always zero if this packet
> contains parity data. The calling of {{getNumChunks}} may cause potential
> errors.
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