[jira] [Created] (CASSANDRA-8239) NamesQueryFilters do not update SSTable read rate metrics

["Tyler Hobbs (JIRA)" <ji...@apache.org>]

Tyler Hobbs created CASSANDRA-8239:
--------------------------------------

             Summary: NamesQueryFilters do not update SSTable read rate metrics
                 Key: CASSANDRA-8239
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8239
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Tyler Hobbs
            Assignee: Tyler Hobbs
            Priority: Blocker
             Fix For: 2.1.2


In {{CollationController.collectionTimeOrderedData()}}, we are not calling {{sstable.incrementReadCount()}}.  If a table is queried exclusively with these types of queries, its read meter will never be updated.  Since SizeTieredCompactionStrategy depends on the read meter for omitting cold sstables form compaction, this can result in no compactions being performed.  (I believe this would require an occasional non-NamesQueryFilter query to happen, because if all of the readMeters have a rate of 0.0, compaction will proceed normally.)  The IndexSummaryManager is also affected.

A workaround for compactions not occurring is to run the following:

{noformat}
ALTER TABLE <tablename> WITH compaction = {'class': 'SizeTieredCompactionStrategy', 'min_threshold': '4', 'max_threshold': '32', 'cold_reads_to_omit': 0.0};
{noformat}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)