cuijianwei created HBASE-10992:
----------------------------------
Summary: getRowNum of coprocessor may return error count when
users set qualifiers
Key: HBASE-10992
URL: https://issues.apache.org/jira/browse/HBASE-10992
Project: HBase
Issue Type: Bug
Components: Coprocessors
Affects Versions: 0.94.18
Reporter: cuijianwei
Priority: Minor
We find getRowNum(...) of AggregateImplementation may return error count when
users set qualifiers to the parameter scan. The reason might be the following
code in AggregateImplementation#getRowNum:
{code}
byte[] colFamily = scan.getFamilies()[0];
byte[] qualifier = scan.getFamilyMap().get(colFamily).pollFirst();
...
{/code}
In above code, the method will remove the first user-set qualifier from scan.
Then, the following scan will return all rows containing data belong to the
family, which might lead the miscounting. For example, if we put data for
family='A' and qualifier='a' and count the row by setting family='A' and
qualifier='b' in scan, we will get unexpected count.
In my opinion, it is better to only count rows containing the qualifiers of
family set by user if we allow users to add qualifiers to scan; otherwise, it
might be better to prevent users from adding qualifiers to scan of
AggregationClient#rowCount.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
