缓存不在Cassandra工作

Question

在检查Opscenter或cfstats时，我似乎没有启用任何缓存。我在Debian上用Solandra运行Cassandra 1.1.7。我在cassandra.yaml中设置了所需的全局选项：

key_cache_size_in_mb: 800
key_cache_save_period: 14400
row_cache_size_in_mb: 800
row_cache_save_period: 15400
row_cache_provider: SerializingCacheProvider

列族创建如下：

create column family example
with column_type = 'Standard'
and comparator = 'BytesType'
and default_validation_class = 'BytesType'
and key_validation_class = 'BytesType'
and read_repair_chance = 1.0
and dclocal_read_repair_chance = 0.0
and gc_grace = 864000
and min_compaction_threshold = 4
and max_compaction_threshold = 32
and replicate_on_write = true
and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'
and caching = 'ALL';

Opscenter没有显示缓存图表的数据，而且CFSTATS没有显示任何缓存相关字段：

Column Family: charsets
SSTable count: 1
Space used (live): 5558
Space used (total): 5558
Number of Keys (estimate): 128
Memtable Columns Count: 0
Memtable Data Size: 0
Memtable Switch Count: 0
Read Count: 61381
Read Latency: 0.123 ms.
Write Count: 0
Write Latency: NaN ms.
Pending Tasks: 0
Bloom Filter False Postives: 0
Bloom Filter False Ratio: 0.00000
Bloom Filter Space Used: 16
Compacted row minimum size: 1917
Compacted row maximum size: 2299
Compacted row mean size: 2299

感谢任何帮助或建议。

萨姆

Answer 1

缓存统计信息已从cfstats移至Cassandra 1.1中的信息。如果您运行nodetool信息，您应该看到类似的内容：

Key Cache : size 5552 (bytes), capacity 838860800 (bytes), 38 hits, 47 requests, 0.809 recent hit rate, 14400 save period in seconds
Row Cache : size 0 (bytes), capacity 838860800 (bytes), 0 hits, 0 requests, NaN recent hit rate, 15400 save period in seconds

这是因为现在有全局缓存，而不是每个CF.似乎Opscenter需要更新此更改 - 可能有更新的版本可用。