counter cache hits not recording?

gistfile1.txt

Trivial repro on 3.7 with scripts below: 

{code}
#!/bin/sh

ccm remove test

ccm create test -v 3.7 -n 1
sed -i'' -e 's/row_cache_size_in_mb: 0/row_cache_size_in_mb: 100/g' .ccm/test/node1/conf/cassandra.yaml
ccm start
sleep 5


ccm node1 cqlsh < ~/keyspace.cql
ccm node1 cqlsh < ~/table-counter.cql
ccm node1 cqlsh < ~/table-counter-clustering.cql

echo "Schema created, reads and writes starting"
ccm node1 nodetool info | grep Cache

echo "UPDATE test.test SET v=v+1 WHERE id=1; " | ccm node1 cqlsh
echo "UPDATE test.test2 SET v=v+1 WHERE id=1 and c=1; " | ccm node1 cqlsh
echo "UPDATE test.test2 SET v=v+1 WHERE id=1 and c=2; " | ccm node1 cqlsh

echo "SELECT * FROM test.test WHERE id=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache
echo "SELECT * FROM test.test WHERE id=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache

echo "SELECT * FROM test.test2 WHERE id=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache
echo "SELECT * FROM test.test2 WHERE id=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache
echo "SELECT * FROM test.test2 WHERE id=1 and c=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache
echo "SELECT * FROM test.test2 WHERE id=1 and c=1; " | ccm node1 cqlsh
ccm node1 nodetool info | grep Cache
{code}

Keyspace / tables:

{code}
CREATE KEYSPACE test WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'}  AND durable_writes = true;
{code}

{code}
CREATE TABLE test.test (
    id int PRIMARY KEY,
    v counter
) WITH caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'};
{code}

{code}
CREATE TABLE test.test2 (
    id int,
    c int,
    v counter,
    PRIMARY KEY(id, c)
) WITH caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'};
{code}


Output:

{code}
Schema created, reads and writes starting
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 61 hits, 84 requests, 0.726 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 0, size 0 bytes, capacity 12 MiB, 0 hits, 0 requests, NaN recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 227 requests, 0.833 recent hit rate, 80.234 microseconds miss latency

 id | v
----+---
  1 | 1

(1 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 70 hits, 93 requests, 0.753 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 288 requests, 0.868 recent hit rate, 80.234 microseconds miss latency

 id | v
----+---
  1 | 1

(1 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 72 hits, 95 requests, 0.758 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 303 requests, 0.875 recent hit rate, 80.234 microseconds miss latency

 id | c | v
----+---+---
  1 | 1 | 1
  1 | 2 | 1

(2 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 74 hits, 97 requests, 0.763 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 318 requests, 0.881 recent hit rate, 80.234 microseconds miss latency

 id | c | v
----+---+---
  1 | 1 | 1
  1 | 2 | 1

(2 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 76 hits, 99 requests, 0.768 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 333 requests, 0.886 recent hit rate, 80.234 microseconds miss latency

 id | c | v
----+---+---
  1 | 1 | 1

(1 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 78 hits, 101 requests, 0.772 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 348 requests, 0.891 recent hit rate, 80.234 microseconds miss latency

 id | c | v
----+---+---
  1 | 1 | 1

(1 rows)
Key Cache              : entries 17, size 1.29 KiB, capacity 24 MiB, 80 hits, 103 requests, 0.777 recent hit rate, 14400 save period in seconds
Row Cache              : entries 0, size 0 bytes, capacity 100 MiB, 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds
Counter Cache          : entries 3, size 328 bytes, capacity 12 MiB, 0 hits, 3 requests, 0.000 recent hit rate, 7200 save period in seconds
Chunk Cache            : entries 14, size 896 KiB, capacity 91 MiB, 38 misses, 363 requests, 0.895 recent hit rate, 80.234 microseconds miss latency
{code}