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)
