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Posted to commits@cassandra.apache.org by "Jay Zhuang (JIRA)" <ji...@apache.org> on 2018/07/17 03:56:00 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 ]
Jay Zhuang updated CASSANDRA-14570:
-----------------------------------
Reproduced In: 4.0
Status: Patch Available (was: Open)
> 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: Configuration
> Reporter: Shichao An
> Assignee: Shichao An
> Priority: Minor
>
> 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 the CommitLogSegmentManagerCDC will be unable to process new CL segments. (See CommitLogSegmentManagerCDC.processNewSegment method)
>
> I will attach patches later.
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