[
https://issues.apache.org/jira/browse/CASSANDRA-11427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Podkowinski updated CASSANDRA-11427:
-------------------------------------------
Summary: Range slice queries CL > ONE trigger read-repair of purgeable
tombstones (was: Range slice queries CL > ONE trigger read-repair of purgable
tombstones)
> Range slice queries CL > ONE trigger read-repair of purgeable tombstones
> ------------------------------------------------------------------------
>
> Key: CASSANDRA-11427
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11427
> Project: Cassandra
> Issue Type: Bug
> Reporter: Stefan Podkowinski
> Assignee: Stefan Podkowinski
> Fix For: 2.1.x, 2.2.x
>
> Attachments: 11427-2.1.patch
>
>
> Range queries will trigger read repairs for purgeable tombstones on hosts
> that already compacted given tombstones. Clusters with periodical jobs for
> scanning data ranges will likely see tombstones ressurected through RRs just
> to have them compacted again later at the destination host.
> Executing range queries (e.g. for reading token ranges) will compare the
> actual data instead of using digests when executed with CL > ONE. Responses
> will be consolidated by {{RangeSliceResponseResolver.Reducer}}, where the
> result of {{RowDataResolver.resolveSuperset}} is used as the reference
> version for the results. {{RowDataResolver.scheduleRepairs}} will then send
> the superset to all nodes that returned a different result before.
> Unfortunately this does also involve cases where the superset is just made up
> of purgeable tombstone(s) that already have been compacted on the other
> nodes. In this case a read-repair will be triggered for transfering the
> purgeable tombstones to all other nodes nodes that returned an empty result.
> The issue can be reproduced with the provided dtest or manually using the
> following steps:
> {noformat}
> create keyspace test1 with replication = { 'class' : 'SimpleStrategy',
> 'replication_factor' : 2 };
> use test1;
> create table test1 ( a text, b text, primary key(a, b) ) WITH compaction =
> {'class': 'SizeTieredCompactionStrategy', 'enabled': 'false'} AND
> dclocal_read_repair_chance = 0 AND gc_grace_seconds = 0;
> delete from test1 where a = 'a';
> {noformat}
> {noformat}
> ccm flush;
> ccm node2 compact;
> {noformat}
> {noformat}
> use test1;
> consistency all;
> tracing on;
> select * from test1;
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
