我们的java应用程序在表的1上执行批插入,该表模式类似于。。
CREATE TABLE "My_KeySpace"."my_table" (
key text,
column1 varint,
column2 bigint,
column3 text,
column4 boolean,
value blob,
PRIMARY KEY (key, column1, column2, column3, column4)
) WITH CLUSTERING ORDER BY ( column1 DESC, column2 DESC, column3 ASC, column4 ASC )
AND COMPACT STORAGE
AND bloom_filter_fp_chance = 0.1
AND comment = ''
AND crc_check_chance = 1.0
AND dclocal_read_repair_chance = 0.0
AND default_time_to_live = 0
AND gc_grace_seconds = 0
AND max_index_interval = 2048
AND memtable_flush_period_in_ms = 0
AND min_index_interval = 128
AND read_repair_chance = 0.1
AND speculative_retry = 'NONE'
AND caching = {
'keys' : 'ALL',
'rows_per_partition' : 'NONE'
}
AND compression = {
'chunk_length_in_kb' : 64,
'class' : 'LZ4Compressor',
'enabled' : true
}
AND compaction = {
'class' : 'LeveledCompactionStrategy',
'sstable_size_in_mb' : 5
};
在上述架构中,gc\u grace\u seconds=0。因此,我得到以下警告:
2019-02-05 01:59:53.087 WARN [SharedPool-Worker-5 - org.apache.cassandra.cql3.statements.BatchStatement:97] Executing a LOGGED BATCH on table [My_KeySpace.my_table], configured with a gc_grace_seconds of 0. The gc_grace_seconds is used to TTL batchlog entries, so setting gc_grace_seconds too low on tables involved in an atomic batch might cause batchlog entries to expire before being replayed.
我看过Cassandra代码,这个警告是有明显的原因在:这一行
在应用程序中不更改批次代码的任何解决方案??我应该增加gc\u grace\u秒吗?
1条答案
按热度按时间h4cxqtbf1#
在cassandra中,批处理并不是优化数据库插入的方法—它们通常主要用于协调写入多个表等。如果使用批处理插入多个分区,则性能会更差。
使用异步命令执行(通过
executeAsync
),和/或使用批处理,但仅针对针对同一分区的插入。