You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@cassandra.apache.org by "Josh McKenzie (Jira)" <ji...@apache.org> on 2021/07/15 20:01:00 UTC
[jira] [Updated] (CASSANDRA-14570) Improper default value of
cdc_total_space_in_mb
[ https://issues.apache.org/jira/browse/CASSANDRA-14570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Josh McKenzie updated CASSANDRA-14570:
--------------------------------------
Reviewers: Josh McKenzie
> 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: Shichao An
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org