我们有一个 RF 3 的三节点 Cassandra 集群。有一个具有 SizeTieredCompaction 策略的表。在某些情况下, nodetool compact --split-output -- <keyspace> <table>
对该表执行主要压缩不会释放磁盘,但执行 nodetool garbagecollect -- <keyspace> <table>
会释放磁盘。gc_grace_seconds 设置为 1 小时,default_time_to_live 设置为 3 小时:
</p>
CREATE TABLE keyspace.table (
id text PRIMARY KEY,
json text
) WITH bloom_filter_fp_chance = 0.01
AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
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 = 10800
AND gc_grace_seconds = 3600
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.0
AND speculative_retry = '99PERCENTILE';
有谁知道原因?
提前致谢!