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https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Baugher updated HBASE-3996:
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Attachment: 3996-v8.txt
I would like to offer to finish this issue. If you would rather close this
issue or start a new one that is fine just let me know.
Here is what I have done from the previous version,
* Removed random formatting changes
* Removed table.close() in TableRecordReaderImpl
* Replaced MultiTableInputCollection with List<Scan>
* Brought up to date with trunk
Remaining questions,
* Since most of enum Version code is copied, we may want to factor the base
enum to its own class. Would org.apache.hadoop.hbase.util be a good namespace
for the enum class ?
* The changes to TableSplit would not allow a new version of it to be
deserialized by an old server. Is that OK for a M/R job?
* It has been mentioned to scope this to scans (of a single table) rather then
multiple tables.
I can't seem to get the tests to run for me (getting OOM errors) but I would
imagine most everything still works.
> Support multiple tables and scanners as input to the mapper in map/reduce jobs
> ------------------------------------------------------------------------------
>
> Key: HBASE-3996
> URL: https://issues.apache.org/jira/browse/HBASE-3996
> Project: HBase
> Issue Type: Improvement
> Components: mapreduce
> Reporter: Eran Kutner
> Assignee: Lars Hofhansl
> Fix For: 0.96.0, 0.94.5
>
> Attachments: 3996-v2.txt, 3996-v3.txt, 3996-v4.txt, 3996-v5.txt,
> 3996-v6.txt, 3996-v7.txt, 3996-v8.txt, HBase-3996.patch
>
>
> It seems that in many cases feeding data from multiple tables or multiple
> scanners on a single table can save a lot of time when running map/reduce
> jobs.
> I propose a new MultiTableInputFormat class that would allow doing this.
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