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Marcus Eriksson commented on CASSANDRA-14647: --------------------------------------------- [~nezdali] could you post logs? > Reading cardinality from Statistics.db failed > --------------------------------------------- > > Key: CASSANDRA-14647 > URL: https://issues.apache.org/jira/browse/CASSANDRA-14647 > Project: Cassandra > Issue Type: Bug > Components: Compaction > Environment: Clients are doing only writes with Local One, cluster > consist of 3 regions with RF3. > Storage is configured wth jbod/XFS on 10 x 1Tb disks > IOPS limit for each disk 500 (total 5000 iops) > Bandwith for each disk 60mb/s (600 total) > OS is Debian linux. > Reporter: Vitali Djatsuk > Priority: Major > Fix For: 3.0.x > > Attachments: cassandra_compaction_pending_tasks_7days.png > > > There is some issue with sstable metadata which is visible in system.log, the > messages says: > {noformat} > WARN [Thread-6] 2018-07-25 07:12:47,928 SSTableReader.java:249 - Reading > cardinality from Statistics.db failed for > /opt/data/disk5/data/keyspace/table/mc-big-Data.db.{noformat} > Although there is no such file. > The message has appeared after i've changed the compaction strategy from > SizeTiered to Leveled. Compaction strategy has been changed region by region > (total 3 regions) and it has coincided with the double client write traffic > increase. > I have tried to run nodetool scrub to rebuilt the sstable, but that does not > fix the issue. > So very hard to define the steps to reproduce, probably it will be: > # run stress tool with write traffic > # under load change compaction strategy from SireTiered to Leveled for the > bunch of hosts > # add more write traffic > Reading the code it is said that if this metadata is broken, then "estimating > the keys will be done using index summary". > > [https://github.com/apache/cassandra/blob/cassandra-3.0.17/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java#L247] > -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org