[CASSANDRA-7866] Negative space stats

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Duplicate
• Severity: Normal
• Assignee: Unassigned
• Reporter: Thomas Adam
• Created: 03/Sep/14 09:56
• Updated: 16/Apr/19 09:31
• Resolved: 03/Sep/14 10:33

Description

Hi folks,

I played with the 2.1.0rc7 and observed wrong space/load stats after some compactions.

$ bin/nodetool status bench_1
UN  10.2.0.133  -111945897565 bytes  256     42,7%             f2d14317-b52c-4d0a-9276-0ac71c263269  rack1
UN  10.2.0.134  -74341626598 bytes  256     43,0%             6e263f2e-2220-4c14-8bb1-f8d55aceb25c  rack1
UN  10.2.0.135  -81553517188 bytes  256     44,4%             bae17a16-e541-47bf-af5c-2a98dbfa6db5  rack1
UN  10.2.0.136  -112538823395 bytes  256     42,3%             40ec60db-7566-46a4-a87d-39e7cdad7568  rack1
UN  10.2.0.137  -52321927763 bytes  256     41,4%             97c5bcc3-2ecf-4305-abed-3f5e4cc434e5  rack1
UN  10.2.0.138  -1451999899 bytes  256     41,6%             8a15196e-9acb-41a6-b1f1-0e24e47bfa5a  rack1
UN  10.2.0.139  -121058278557 bytes  256     44,6%             05a06af8-6cd3-47b8-8e24-2660064d265c  rack1

$ bin/nodetool cfstats bench_1.assoc_list
Keyspace: bench_1
	Read Count: 177810
	Read Latency: 0.8124693324334964 ms.
	Write Count: 9726101
	Write Latency: 0.014907714818096173 ms.
	Pending Flushes: 0
		Table: assoc_list
		SSTable count: 9
		Space used (live), bytes: -773872869
		Space used (total), bytes: -773872869
		Space used by snapshots (total), bytes: 0
		SSTable Compression Ratio: 0.33017935017332883
		Memtable cell count: 789054
		Memtable data size, bytes: 56618328
		Memtable switch count: 18
		Local read count: 177812
		Local read latency: 0,813 ms
		Local write count: 9726127
		Local write latency: 0,015 ms
		Pending flushes: 0
		Bloom filter false positives: 2522
		Bloom filter false ratio: 0,05585
		Bloom filter space used, bytes: 5030400
		Compacted partition minimum bytes: 150
		Compacted partition maximum bytes: 25109160
		Compacted partition mean bytes: 12720
		Average live cells per slice (last five minutes): 30.33307088385486
		Average tombstones per slice (last five minutes): 0.0

Regards,
Thomas

Issue Links

• duplicates: CASSANDRA-7239 Nodetool Status Reports Negative Load With VNodes Disabled