这些选项让系统能够容忍变化，有了选择的自由，我们可以耐心的等待信息完整之后才作出决定，以及应对一些预计外的事件。锁定的含义则刚好相反：锁定使得软件很难从一种方案切换到另一种方案。很多架构师可能会将锁定视为大敌，同时认为自己守护着 IT 世界中的自由，在这世界中，组件可以被随意替换和互联。
A:DBwithTTLitself does not provide an upper time bound. Expired keys will be removed when they are part of any compaction. However, there is no guarantee that when such compaction will start. For instance, if you have a certain key-range that is never updated, then compaction is less lik...
A: All the releases inhttps://github.com/facebook/rocksdb/releasesare stable. For RocksJava, stable releases are available inhttps://oss.sonatype.org/#nexus-search;quick~rocksdb. 地址为https://github.com/facebook/rocksdb/releases。对于java用户,稳定版地址为https://oss.sonatype.org/#nexus-se...
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| ndbinfo | NO | MySQL Cluster system information storage engine | NULL | NULL | NULL | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO | ...
Keys and values are treated as pure byte streams. There is no limit to the size of a key or a value. The Get API allows an application to fetch a single key-value from the database. The MultiGet API allows an application to retrieve a bunch of keys from the database. All the keys...
Unlike libaio, no registration and callback is required, and memory doesn't need to be aligned either. Therefore, we did not encounter any trouble when using this interface to transform the original psync IO of RocksDB, but simply replaced their function names. 3. Synchronization, locks, and...
If the file_checksum_gen_factory is not set or set to any other customized factory, there is no checksum verification to detect if SST files in a DB are corrupt when read, copied, and independently checksummed by BackupEngine. When a DB sets stats_dump_period_sec > 0, either as the ...
AdvancedColumnFamilyOptions::force_consistency_checks is now true by default, for more proactive DB corruption detection at virtually no cost (estimated two extra CPU cycles per million on a major production workload). Corruptions reported by these checks now mention "force_consistency_checks" in ca...
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