Hello, We are using Cassandra 3.0.7 version and off late we see that 90% of memory is occupied even though hard-drive is hardly used. We have a cluster of 5 nodes with 15 GB memory, 4 cores, 200 GB SSD.
We tried all kind of configurations through both YAML as well as table
based properties but none seem to help. Memory usage constantly increases
almost in direct ratio of data.
What we are trying to do is, utilize as less memory as possible and we are
okay with reduced read performance. Application is write intensive. To do
this, our idea was to disable all caches possible, to avoid keeping
anything not-necessary in memory.
​Find attached our yaml and table configuration.
CREATE KEYSPACE if not exists test_ks WITH replication = {'class':
'SimpleStrategy', 'replication_factor': '1'};
CREATE TABLE if not exists test_ks.test_cf (id bigint PRIMARY KEY,key_str
text,value1 int,value2 int,update_ts bigint) WITH bloom_filter_fp_chance =
1 AND comment = '' AND compaction = {'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32', 'min_threshold': '4'} AND compression =
{'chunk_length_in_kb': '64', 'class':
'org.apache.cassandra.io.compress.LZ4Compressor'} AND crc_check_chance =
1.0 AND dclocal_read_repair_chance = 0.1 AND default_time_to_live = 0 AND
gc_grace_seconds = 864000 AND max_index_interval = 10240 AND
memtable_flush_period_in_ms = 3600000 AND min_index_interval = 10240 AND
read_repair_chance = 0.0 AND speculative_retry = '99PERCENTILE' AND caching
= {'keys': 'NONE', 'rows_per_partition': 'NONE'};
Has anyone tried such configuration before? Please let us know if disabling
cache would help us in this situation. And if yes, how we can disable cache
completely.
cassandra.yaml
Description: application/yaml
