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Posted to commits@cassandra.apache.org by "Sam Tunnicliffe (Jira)" <ji...@apache.org> on 2019/12/19 13:24:00 UTC
[jira] [Comment Edited] (CASSANDRA-15461) Legacy counter shards can
cause false positives in repaired data tracking
[ https://issues.apache.org/jira/browse/CASSANDRA-15461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17000054#comment-17000054 ]
Sam Tunnicliffe edited comment on CASSANDRA-15461 at 12/19/19 1:23 PM:
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The patch abstracts the digest generation, wrapping the underlying {{Hasher}} with a new {{Digest}} class. Specializations of {{Digest}} can incorporate logic depending on their specific usage; e.g. when generating a digest for repaired data tracking, don't include legacy counter shards. This also enables a lot of {{ByteBuffer}} duplication to be removed.
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|[15461-4.0|https://github.com/beobal/cassandra/tree/15461-4.0]|[circle|https://circleci.com/gh/beobal/workflows/cassandra/tree/15461-4.0]|
was (Author: beobal):
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|[15461-4.0|https://github.com/beobal/cassandra/tree/15461-4.0]|[circle|https://circleci.com/gh/beobal/workflows/cassandra/tree/15461-4.0]|
> Legacy counter shards can cause false positives in repaired data tracking
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-15461
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15461
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Metrics
> Reporter: Sam Tunnicliffe
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Fix For: 4.0-beta
>
>
> It is expected that the serialization of legacy (pre-2.1) counter cells may differ across replicas due to the remote vs local designation of the shards. This will cause the repaired data digests calculated at read time to differ where certain legacy shards are encountered. This does not, however, indicate corruption of the repaired dataset and there isn't any action that operators can take in this scenario. Excluding counter cells which contain legacy shards from the digest calculation will avoid false positives.
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