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From "Josh McKenzie (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-14570) Improper default value of cdc_total_space_in_mb
Date Wed, 14 Jul 2021 16:54:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-14570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh McKenzie reassigned CASSANDRA-14570:
-----------------------------------------

    Assignee: Josh McKenzie  (was: Shichao An)

> Improper default value of cdc_total_space_in_mb
> -----------------------------------------------
>
>                 Key: CASSANDRA-14570
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14570
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Config
>            Reporter: Shichao An
>            Assignee: Josh McKenzie
>            Priority: Low
>              Labels: CDC
>
> The code for calculating cdc_total_space_in_mb in DatabaseDescriptor.java does not
reflect the latest architecture introduced by CASSANDRA-12148.
> In short, cdc_total_space_in_mb should be equal or greater than commitlog_total_space_in_mb;
otherwise, the writes will fail when on-disk commit logs size reaches the value of cdc_total_space_in_mb.
For example, If cdc_total_space_in_mb is 4096 and commitlog_total_space_in_mb is 8192, when
we enabled the cdc_enabled flag (even if we didn't enable cdc=true on any table), when total
size of commit logs reaches 4096 MB, there is the same of amount of hard links in cdc_raw
directory, that is, 4096 MB of cdc logs. Then, if a table has cdc=true, the writes will fail
in that table because the CommitLogSegmentManagerCDC will be unable to process new CDC segments.
(See allocate and processNewSegment in CommitLogSegmentManagerCDC class)
>  
> I will attach patches later.



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