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From "Maor Cohen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10801) Unexplained inconsistent data with Cassandra 2.1
Date Mon, 21 Dec 2015 13:52:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066461#comment-15066461
] 

Maor Cohen commented on CASSANDRA-10801:
----------------------------------------

We started with write ONE and read ONE.
Then we changed write ONE and read ALL,  write ALL and read ONE but records were still missing.
Currently the setting is read and write in QUORUM consistency.

Reloading to table with different name is an option but we want to try other things before
we going in this direction.


> Unexplained inconsistent data with Cassandra 2.1
> ------------------------------------------------
>
>                 Key: CASSANDRA-10801
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10801
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Imri Zvik
>             Fix For: 2.1.x
>
>         Attachments: trace2.log, tracing.log
>
>
> We are experiencing weird behavior which we cannot explain.
> We have a CF, with RF=3, and we are writing and reading data to it with consistency level
of ONE.
> For some reason, we see inconsistent results when querying for data.
> Even for rows that were written a day ago, we're seeing inconsistent results (1 replca
has the data, the two others don't).
> Now, I would expect to see timeouts/dropped mutations, but all relevant counters are
not advancing, and I would also expect hints to fix this inconsistency within minutes, but
yet it doesn't.
> {code}
> cqlsh:testing> SELECT WRITETIME(last_update),site_id, tree_id, individual_id, last_update
FROM testcf WHERE site_id = 229673621 AND tree_id = 9 AND individual_id = 9032483;       
    
>  writetime(last_update) | site_id   | tree_id | individual_id | last_update
> ------------------------+-----------+---------+---------------+-------------
>        1448988343028000 | 229673621 |       9 |       9032483 |  1380912397
> (1 rows)
> cqlsh:testing> SELECT WRITETIME(last_update),site_id, tree_id, individual_id, last_update
FROM testcf WHERE site_id = 229673621 AND tree_id = 9 AND individual_id = 9032483;
> site_id   | tree_id | individual_id | last_update
> -----------+---------+---------------+-------------
> (0 rows)
> cqlsh:testing> SELECT dateof(now()) FROM system.local ;
>  dateof(now())
> --------------------------
>  2015-12-02 14:48:44+0000
> (1 rows)
> {code}
> We are running with Cassandra 2.1.11 with Oracle Java 1.8.0_65-b17



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