add filter info to slow query logging
-------------------------------------
Key: HBASE-4542
URL: https://issues.apache.org/jira/browse/HBASE-4542
Project: HBase
Issue Type: Improvement
Reporter: Kannan Muthukkaruppan
Slow query log doesn't report filter in effect.
For example:
{code}
(operationTooSlow): \
{"processingtimems":3468,"client":"10.138.43.206:40035","timeRange":
[0,9223372036854775807],\
"starttimems":1317772005821,"responsesize":42411, \
"class":"HRegionServer","table":"myTable","families":{"CF1":"ALL"]},\
"row":"6c3b8efa132f0219b7621ed1e5c8c70b","queuetimems":0,\
"method":"get","totalColumns":1,"maxVersions":1,"storeLimit":-1}
{code}
the above would suggest that all columns of myTable:CF1 are being requested for
the given row. But in reality there could be filters in effect (such as
ColumnPrefixFilter, ColumnRangeFilter, TimestampsFilter() etc.). We should
enhance the slow query log to capture & report this information.
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