compaction_window_unit:时间单位,用来定义窗口大小(milliseconds,seconds,hours等等) compaction_window_size:每个窗口有多少单元(1,2,3等等) 上面配置的一个例子:compaction_window_unit = ‘minutes’,compaction_window_size = 60 优势:用作时间序列数据,为表中所有数据使用默认的TTL。比DTCS配置更简单。 劣势:不...
AND COMPACTION = {'class': 'TimeWindowCompactionStrategy', 'compaction_window_unit': 'DAYS', 'compaction_window_size': 1}; 插入到表中需要使用date和now()值(你也可以在你的应用代码中生成一个TimeUUID): INSERT INTO raw_data_by_day (sensor, day, ts, reading) VALUES ('mysensor', '2017-01...
TimeWindowCompactionStrategy:这种sstable根据时间来分割,写法如下:compaction = {'class': 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy','compaction_window_unit': 'hours', 'compaction_window_size': '24'}s这种方法的对于时序数据来说特别好使。 Cassandra的数据类型: 这没啥好说的,直接看...
"rows_per_partition":"NONE"}'ANDcomment=''ANDgc_grace_seconds =60ANDdefault_time_to_live =600ANDcompaction = {'compaction_window_size':'1','compaction_window_unit':'MINUTES','class':'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy'} ...
compaction_window_unitTime unit used to define the bucket size, milliseconds, seconds, hours, etc. Default value:milliseconds. compaction_window_sizeUnits per bucket. LeveledCompactionStrategy (LCS) Creates SSTables of a fixed, relatively small size (160 MB by default) that are grouped into levels...
'compaction_window_unit': 'HOURS', 'class': 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy'} 一周后我有7张table(每天1张)。我需要7天的数据,所以我想使用ttl和gc\u grace\u seconds,但是cassandra doe不支持在带有counter列的表上使用ttl。。我的另一个选择是使用一些作业来删除超过7天...
'compaction_window_unit': 'HOURS', 'class': 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy'} 一周后我有7张table(每天1张)。我需要7天的数据,所以我想使用ttl和gc\u grace\u seconds,但是cassandra doe不支持在带有counter列的表上使用ttl。。我的另一个选择是使用一些作业来删除超过7天...
AND compaction = {'class': 'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy', 'compaction_window_size': '1', 'compaction_window_unit': 'DAYS', 'max_threshold': '32', 'min_threshold': '4'} AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandr...
WITH compaction = {'class': 'TimeWindowCompactionStrategy', 'compaction_window_size': '7', 'compaction_window_unit': 'DAYS'} AND compression = {'class': 'LZ4Compressor', 'chunk_length_in_kb': '64'} AND bloom_filter_fp_chance = 0.01; ...
CREATETABLEraw_data(sensor text,ts timeuuid,readintint,primarykey(sensor,ts))WITHCLUSTERINGORDERBY(ts DESC)ANDcompaction={'class':'TimeWindowCompactionStrategy','compaction_window_size':1,'compaction_window_unit':'DAYS'}; 这个数据模型只保存简单的传感器数据。实际中我们采集的数据远远比一个整数复杂,...