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https://issues.apache.org/jira/browse/CASSANDRA-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484989#comment-14484989
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Roger Schildmeijer commented on CASSANDRA-9086:
-----------------------------------------------
[~philipthompson] [~slebresne] I have managed to reproduce this behavior using
https://github.com/rschildmeijer/cassandra-9086 talking to our production
cluster (ie the 24 (6+6+6+6) nodes cluster)
(I could not reproduce when running against a single node local Cassandra node
(also using version 2.0.11))
I first see quite a lot of pool timeouts (fast failing because max outstanding
(128 outstanding stream ids per tcp connection) is reached).
Then after that I hit this bug (like ~1 per second)
> CAS precondition mismatch - row is still inserted
> -------------------------------------------------
>
> Key: CASSANDRA-9086
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9086
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra version 2.0.11
> 24 nodes in 4 datacenters (6 nodes per dc)
> Reporter: Roger Schildmeijer
> Assignee: Carl Yeksigian
> Priority: Critical
> Fix For: 2.0.15
>
> Attachments: conditional_insert_failure_cleaned.txt
>
>
> Cassandra claims CAS precondition didn't match current values[1], but the row
> is still inserted.
> We are having a quite simple cf schema:
> {code:xml}
> create table index (
> u text PRIMARY KEY,
> abc set<uuid>,
> ) WITH
> compaction={'class': 'LeveledCompactionStrategy'};
> {code}
> CQL statement:
> {code:xml}
> INSERT INTO index(u, abc) VALUES(?, ?) IF NOT EXISTS
> {code}
> Sometimes, especially during some write load, Cassandra claims the
> conditional insert wasn't satisfied ([applied] false), but the row is still
> inserted.
> The response from the conditional insert contains [applied]=false + the data
> we tried to insert.
> A full CQL trace is attached.
> [1] CAS precondition CAS precondition
> org.apache.cassandra.cql3.statements.CQL3CasConditions@1b2576ce does not
> match current values ColumnFamily(username_index
> -{deletedAt=-9223372036854775808, localDeletion=2147483647,
> ranges=[abc-abc:!, deletedAt=1427889576525999, localDeletion=1427889564]}-
> [:false:0@1427889576526000,abc:39f1a470ee694761a8197c0d0ada8e8f:false:0@1427889576526000,])
> | 11:59:37.060 | /10.0.0.1 | 533702
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