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Posted to commits@cassandra.apache.org by "Shichao An (JIRA)" <ji...@apache.org> on 2018/07/17 00:41:00 UTC
[jira] [Created] (CASSANDRA-14570) Improper default value of
cdc_total_space_in_mb
Shichao An created CASSANDRA-14570:
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Summary: 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 Write-Read Paths
Reporter: Shichao An
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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