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From "Sylvestor George (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-10021) Losing writes in a single-node cluster
Date Tue, 11 Aug 2015 15:57:46 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-10021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvestor George reassigned CASSANDRA-10021:
--------------------------------------------

    Assignee: Sylvestor George

> Losing writes in a single-node cluster
> --------------------------------------
>
>                 Key: CASSANDRA-10021
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10021
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Docker images
>            Reporter: Jeremy Schlatter
>            Assignee: Sylvestor George
>         Attachments: cpp-repro.zip, go-repro.zip
>
>
> I am able to reliably reproduce write losses in the following circumstances:
> * Set up a single-node cluster.
> * Create keyspace with SimpleStrategy, replication_factor = 1.
> * Create a table with a float field.
> * Send an UPDATE command to set the float value on a row.
> * After the command returns, immediately send another UPDATE to set the float value to
something _smaller_ than the first value.
> * The second UPDATE is sometimes lost.
> Reproduction code attached. There are two implementations: one in Go and one in C++.
They do the same thing -- I implemented both to rule out a bug in the client library. For
both cases, you can reproduce by doing the following:
> 1. docker run --name repro-cassandra --rm cassandra:2.0.14
> (or any other Cassandra version)
> 2. Download and unzip one of the zip files, and change to its directory.
> 3. docker build -t repro .
> 4. docker run --link repro-cassandra:cassandra --rm repro
> The reproduction code will repeatedly run two UPDATEs followed by a SELECT until it detects
a lost write, and then print:
> "Lost a write. Got 20.500000, want 10.500000"
> This may be fixed in 2.1.8 because I have not been able to reproduce it in that version.



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