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From "Tania S Engel (JIRA)" <>
Subject [jira] [Issue Comment Deleted] (CASSANDRA-10876) Alter behavior of batch WARN and fail on single partition batches
Date Fri, 01 Jun 2018 21:48:00 GMT


Tania S Engel updated CASSANDRA-10876:
    Comment: was deleted

(was: In 3.11.1 we still see these warnings even when we are inserting into multiple tables
with the same partition key. The comment above from Patrick seems to indicate a partition
key is for one keyspace.table. But I thought a partition key was a value that hashed to the
same value. Is it still a burden on the coordinator worthy of a warning if we do a batch insert
to 4 tables with the same partition key ({color:#333333}Day{color})? For example if we do
a batch insert into these 2 tables, is that considered a single partition insert and if so
why is there a warning?

CREATE TABLE Log_User (Day timestamp, LogTime timeuuid, {color:#333333}UserID{color} int)  PRIMARY
KEY ({color:#333333}Day {color}, UserID, LogTime)

CREATE TABLE Log_Event( Day timestamp, LogTime timeuuid, EventID  int) {color:#333333}PRIMARY
KEY ({color}{color:#333333}Day {color}{color:#333333}, EventID , LogTime){color})

> Alter behavior of batch WARN and fail on single partition batches
> -----------------------------------------------------------------
>                 Key: CASSANDRA-10876
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Patrick McFadin
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: lhf
>             Fix For: 3.6
>         Attachments: 10876.txt
> In an attempt to give operator insight into potentially harmful batch usage, Jiras were
created to log WARN or fail on certain batch sizes. This ignores the single partition batch,
which doesn't create the same issues as a multi-partition batch. 
> The proposal is to ignore size on single partition batch statements. 
> Reference:
> [CASSANDRA-6487|]
> [CASSANDRA-8011|]

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