主要加速优势来自于,Decimal 计算优化及向量化,Scan、Agg、Join的向量化。TPC-DS 100T记录保持者。 TPC-DS 100T JNI 开销 论文跑了个简单的内存表单列整形读,没有发现明显的 JNI 瓶颈,JNI 内部开销在0.06%,适配器读取0.2%,95%以上CPU在列转行上,然而这部分 DBR 单独跑也是不可省略的。 自适应执行 自适应 ve...
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支持Redis 90%以上的命令 底层优化规避很多不正确的用法 例如: keys被转换为scan支持单机、哨兵、单主集群、多主集群等模式 Lettuce + RedisTemplate 支持模式少 工具使用繁琐连接池采用 common-pool Bug多经常性出问题 缓存注解 采用Spring-Cache 注解 对其扩展了实现支持了更多功能例如 过期时间 最大空闲时间 组最...
InfiniFS: An Efficient Metadata Service for Large-Scale Distributed Filesystems 摘要 Introduction Back...
$ restic --repo /tmp/backup backup ~/work enter password for repository: scan [/home/user/work] scanned 764 directories, 1816 files in 0:00 [0:29] 100.00% 54.732 MiB/s 1.582 GiB / 1.582 GiB 2580 / 2580 items 0 errors ETA 0:00 duration: 0:29, 54.47MiB/s snapshot 40dc1520 saved...
Limited support for NEF files created with Nikon Scan 4 software (thumbnails only). *.orf Olympus ORF Codec, wit fast thumbnail extraction from most ORF files, with intelligent "black borders" removal. Yes Yes Can be configured to skip raw conversion and always use embedded previews instead,...
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at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) Caused by: java.net.SocketTimeoutException: Read timed out ...
2是在file scan和first photon node间插入一个adaptor node用来将文件读取的数据转成列存数据，这里用了...
首先，企业会将大量数据存储在弹性、可扩展的data lake上比如amazon s3、azure data lake storage，google...