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https://issues.apache.org/jira/browse/HDFS-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872476#comment-13872476
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Jing Zhao commented on HDFS-5704:
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Thanks Nicholas! Then I will create a separate jira for merging HDFS-5704 and
HDFS-5777 to branch-2.
> Change OP_UPDATE_BLOCKS with a new OP_ADD_BLOCK
> ------------------------------------------------
>
> Key: HDFS-5704
> URL: https://issues.apache.org/jira/browse/HDFS-5704
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Suresh Srinivas
> Assignee: Jing Zhao
> Attachments: HDFS-5704-branch2.patch, HDFS-5704.000.patch,
> HDFS-5704.001.patch, HDFS-5704.002.patch, HDFS-5704.003.patch, editsStored,
> editsStored
>
>
> Currently every time a block a allocated, the entire list of blocks are
> written in the editlog in OP_UPDATE_BLOCKS operation. This has n^2 growth
> issue. The total size of editlog records for a file with large number of
> blocks could be huge.
> The goal of this jira is discuss adding a different editlog record that only
> records allocation of block and not the entire block list, on every block
> allocation.
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