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https://issues.apache.org/jira/browse/HADOOP-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HADOOP-11569:
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Attachment: HADOOP-11569-001.patch
Attaching the patch.
This will do the merge in below manner.
# Read first key/value from all input files to keys/values array
# Select the least key and corresponding value
# Write the selected key and value to output file
# Read the next key/value of selected input
# Repeat step 2-4 till all keys are read
Please review
> Provide Merge API for MapFile to merge multiple similar MapFiles to one
> MapFile
> -------------------------------------------------------------------------------
>
> Key: HADOOP-11569
> URL: https://issues.apache.org/jira/browse/HADOOP-11569
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Attachments: HADOOP-11569-001.patch
>
>
> If there are multiple similar MapFiles of the same keyClass and value
> classes, then these can be merged together to One MapFile to allow search
> easier.
> Provide an API similar to {{SequenceFile#merge()}}.
> Merging will be easy with the fact that MapFiles are already sorted.
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