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https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232418#comment-13232418
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Zhihong Yu commented on HBASE-3996:
-----------------------------------
There is one compilation error:
{code}
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile)
on project hbase: Compilation failure
[ERROR]
/Users/zhihyu/trunk-hbase/src/main/java/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.java:[85,7]
cannot find symbol
[ERROR] symbol : method init()
[ERROR] location: class org.apache.hadoop.hbase.mapreduce.TableRecordReader
{code}
If I change the init() call to the following:
{code}
trr.initialize(split, context);
{code}
compiler complains that InterruptedException isn't handled.
@Eran:
Please address the above based on modified patch and make sure
TestMultiTableInputFormat passes.
> 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
> Fix For: 0.94.0
>
> Attachments: 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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