Daniel Kador created CASSANDRA-6522:
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Summary: DroppableTombstoneRatio JMX value is 0.0 for all CFs
Key: CASSANDRA-6522
URL: https://issues.apache.org/jira/browse/CASSANDRA-6522
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Ubuntu 12.04 LTS, Cassandra 1.2.8
Reporter: Daniel Kador
Priority: Minor
We're seeing that the JMX value for DroppableTombstoneRatio for all our CFs is
0.0. On the face of it that seems wrong since we've definitely issued a ton of
deletes for row keys to expire some old data that we no longer need (and it
definitely hasn't been reclaimed from disk yet). Am I misunderstanding what
this means / how to use it? We're on 1.2.8 and using leveled compaction for all
our CFs.
gc_grace_seconds is set to 1 day and we've issued a series of deletes over a
day ago, so gc_grace has elapsed.
Cluster is 18 nodes. Two DCs, so 9 nodes in each DC. Each node has capacity
for 1.5TB or so and is sitting with about 1TB under management. That's why we
wanted to do deletes, obviously. Most of that 1TB is a single CF (called
"events") which represents intermediate state for us that we can delete.
Happy to provide any more info, just let me know.
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