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https://issues.apache.org/jira/browse/HDFS-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13871812#comment-13871812
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Andrew Wang commented on HDFS-5704:
-----------------------------------
Just a heads up, there's been another LV change in trunk/branch-2. We
probably want to pull this one in too during the C5b2 backport bonanza.
---------- Forwarded message ----------
From: Jing Zhao (JIRA) <j...@apache.org>
Date: Tue, Jan 14, 2014 at 11:21 PM
Subject: [jira] [Updated] (HDFS-5704) Change OP_UPDATE_BLOCKS with a new
OP_ADD_BLOCK
To: andrew.w...@cloudera.com
[
https://issues.apache.org/jira/browse/HDFS-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel]
Jing Zhao updated HDFS-5704:
----------------------------
Attachment: editsStored
HDFS-5704-branch2.patch
Backport the change to branch-2. The backported patch merges all the
editlog codes until 39 (OP_ADD_BLOCK) to branch-2, including all the codes
used by CacheManager.
HDFS-5704.001.patch, HDFS-5704.002.patch, HDFS-5704.003.patch, editsStored,
editsStored
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.
only records allocation of block and not the entire block list, on every
block allocation.
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> 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
> 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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