sstable.Properties has a CompressionStats field:

The loading code interns all string fields here:

This is problematic because this string will be different for each sstable. The program will accumulate the strings for all the sstables it has seen over its lifetime.

The string is short so in practice it would probably take a very long time for this memory leak to become a problem.

Jira issue: PEBBLE-1102