ROWCOL bloom filter not used if multiple columns within same family are
requested in a Get
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Key: HBASE-2794
URL: https://issues.apache.org/jira/browse/HBASE-2794
Project: HBase
Issue Type: Improvement
Reporter: Kannan Muthukkaruppan
Noticed the following snippet in StoreFile.java:Scanner:shouldSeek():
{code}
switch(bloomFilterType) {
case ROW:
key = row;
break;
case ROWCOL:
if (columns.size() == 1) {
byte[] col = columns.first();
key = Bytes.add(row, col);
break;
}
//$FALL-THROUGH$
default:
return true;
}
{code}
If columns.size > 1, then we currently don't take advantage of the bloom
filter. We should optimize this to check bloom for each of columns and if none
of the columns are present in the bloom avoid opening the file.
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