Yuki Morishita created CASSANDRA-8205:
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Summary: 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
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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