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https://issues.apache.org/jira/browse/HDFS-1353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jakob Homan updated HDFS-1353:
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Attachment: HDFS-1353.patch
Patch for trunk and 21.
> Remove most of getBlockLocation optimization
> --------------------------------------------
>
> Key: HDFS-1353
> URL: https://issues.apache.org/jira/browse/HDFS-1353
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.21.0
> Reporter: Jakob Homan
> Assignee: Jakob Homan
> Fix For: 0.21.1, 0.22.0
>
> Attachments: Benchmarking results.xlsx, HDFS-1353-y20.patch,
> HDFS-1353.patch
>
>
> <This description is not valid. See comment.>
> HDFS-1081 optimized the number of block access tokens (BATs) created in a
> single call to getBlockLocations, as this is an expensive operation.
> However, that JIRA put off another optimization which was then made possible,
> which is to just send a single block access token across the wire (and
> maintain a single BAT on the client side). This JIRA is for implementing
> that optimization. Since a single BAT is generated for all the blocks, we
> just write that single BAT to the wire, rather than writing n BATs for n
> blocks, as is currently done. This turns out to be a useful optimization for
> files with very large numbers of blocks, as the new lone BAT is much larger
> than was a BAT previously.
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