我知道cassandra合并了sstables，row-key，删除墓碑和所有东西。
我知道压缩的作用，但想知道它是如何实现的(T)
最佳答案
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据我所知
Whenever memtable is flushed from memory to disk they are just appended[Not updated] to new SSTable created, sorted via rowkey.
SSTable merge[updation] will take place only during compaction.
Till then read path will read from all the SSTable having that key you look up and the result from them is merged to reply back,
Two types : Minor and Major
Minor compaction is triggered automatically whenever a new sstable is being created.
May remove all tombstones
Compacts sstables of equal size in to one [initially memtable flush size] when minor compaction threshold is reached [4 by default].
Major Compaction is manually triggered using nodetool
Can be applied over a column family over a time
Compacts all the sstables of a CF in to 1
Compacts the SSTables and marks delete over unneeded SSTables. GC takes care of freeing up that space
问候，
泰米尔语
关于cassandra - Cassandra 在压实过程中会做什么？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7633082/