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https://issues.apache.org/jira/browse/HADOOP-3948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lohit Vijayarenu updated HADOOP-3948:
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Attachment: hadoop-core-trunk.patch
Attached is an initial version (untested) of the patch. This incorporates ideas
from Konstantine who suggested Iterators to traverse list of Storage
Directories. The patch
- adds a new config variable dfs.name.edits.dir whose default value would be
dfs.name.dir. One could have different combinations of directories for both the
variables
- Added a new type StorageDirType which identifies if the directory is of type
_NORMAL_, _FSEDITS_, _FSIMAGE_, _FSEDITS_FSIMAGE_. This way we can have a
directory to store either edits only, images only or both.
- Added an Iterator to go over the list of storage directories. This accepts a
StorageDirType as argument and selects only the matching directories.
- Changed few constructors and methods to accept 2 set of dirs
I am looking into how to change FSEdits::processIOError(int), which used to
accept only index. Few places, this could be changed to accept storage
directory, but few its not straight forward.
> Separate Namenodes edits and fsimage
> -------------------------------------
>
> Key: HADOOP-3948
> URL: https://issues.apache.org/jira/browse/HADOOP-3948
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: Lohit Vijayarenu
> Attachments: hadoop-core-trunk.patch
>
>
> NameNode's _edits_ and _fsimage_ should be separated with an option of having
> them in their own separate directories.
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