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From "Xuesen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (HBASE-15432) TableInputFormat - support multiple column families scan
Date Wed, 14 Dec 2016 07:12:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xuesen Liang updated HBASE-15432:
---------------------------------
    Comment: was deleted

(was: How about to reuse 'SCAN_COLUMN_FAMILY'?

For example, the following code in org.apache.hadoop.hbase.mapreduce.TableInputFormat

{code}
if (conf.get(SCAN_COLUMN_FAMILY) != null) {
  scan.addFamily(Bytes.toBytes(conf.get(SCAN_COLUMN_FAMILY)));
}
{code}

can be replaced by

{code}
for (String cf : conf.getTrimmedStrings(SCAN_COLUMN_FAMILY)) {
  scan.addFamily(Bytes.toBytes(cf));
}
{code}

It is totally compatible.
)

> TableInputFormat - support multiple column families scan
> --------------------------------------------------------
>
>                 Key: HBASE-15432
>                 URL: https://issues.apache.org/jira/browse/HBASE-15432
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 2.0.0, 0.98.16, 0.98.16.1
>            Reporter: nirav patel
>
> Currently Hbase TableInputFormat class has SCAN_COLUMN_FAMILY and SCAN_COLUMNS. SCAN_COLUMN_FAMILY
can only scan single column family. If we need to scan multiple column families from a table
then we must use SCAN_COLUMNS where we must provide both columns and column families which
is not a convenient. Can we have a SCAN_COLUMN_FAMILIES which supports scan of multiple column
families.



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