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https://issues.apache.org/jira/browse/CASSANDRA-8205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuki Morishita updated CASSANDRA-8205:
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Attachment: 8205-2.0.txt
Attaching patch that defers size calculation to the time when
SSTableDeletionTask is run. (This includes test previously attached.)
> ColumnFamilyMetrics#totalDiskSpaceUsed gets wrong value when SSTable is
> deleted
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-8205
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8205
> Project: Cassandra
> Issue Type: Bug
> Reporter: Yuki Morishita
> Priority: Minor
> Fix For: 2.0.12, 2.1.2
>
> Attachments: 0001-ColumnFamilyMetrics-size-metrics-test.patch,
> 8205-2.0.txt
>
>
> ColumnFamilyMetrics#totalDiskSpaceUsed is decremented when actual SSTables
> files are deleted from disk. The amount of decrement is calculated at the
> beginning of SSTableReader instantiation(through
> [SSTableDeletionTask|https://github.com/apache/cassandra/blob/cassandra-2.0.11/src/java/org/apache/cassandra/io/sstable/SSTableDeletingTask.java#L56]).
> But the size can change because Summary.db file may be re-created after
> SSTableReader instantiation, and that leads to calculate wrong value for
> totalDiskSpaceUsed.
> I attached unit test file for 2.0, but you can also compare the value after
> doing "TRUNCATE".
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