Writing Data You may want to jump right in and start throwing data into your TSD, but to really take advantage of OpenTSDB's power and flexibility, you may want to pause and think about your naming schema. After you've done that, you can procede to p…

4.1 Storage requirements for the master dataset To determine the requirements for data storage, you must consider how your data will be written and how it will be read. The role of the batch layer within the Lambda Architecture affects both values. I…

https://cloud.google.com/dataflow/blog/dataflow-beam-and-spark-comparison https://github.com/apache/incubator-beam https://www.oreilly.com/ideas/the-world-beyond-batch-streaming-101 https://www.oreilly.com/ideas/the-world-beyond-batch-streaming-102 h…

Querying and Inserting Data Simple Query Partition Based Query Joins Aggregations Multi Table/File Inserts Dynamic-Partition Insert Inserting into Local Files Sampling Union All Array Operations Map (Associative Arrays) Operations Custom Map/Reduce S…

每次出错的都是和posix相关先把结论说了: fn_ofd_w和fn_ofd_r的SAFE_FCNTL参数F_OFD_SETLKW fn_posix_w和fn_posix_r的SAFE_FCNTL参数F_SETLKW 四个函数都用的flock64结构体 case F_SETLK: case F_SETLKW: err = get_compat_flock(&flock, compat_ptr(arg)); case F_SETLK64: case F_SETLKW64: case F_OFD_S…

Data transfer from GPIO port to RAM buffer using DMA upon receiving a trigger signal on the timer capture input channel. Our requirement is to configure the DMA so that it transfers data from the GPIO lines (8 bit data lines) to the RAM buffer upon r…

deep api integration makes getting value from your big data easy 深度api集成使你大数据訪问更加easy Elasticsearch is quickly becoming the de facto search and analytics solution that organizations are using to provide real-time insights into their Hadoop data. Elas…

Cleaning data in Python   Table of Contents Set up environments Data analysis packages in Python Clean data in Python Load dataset into Spyder Subset Drop data Transform data Create new variables Rename variables Merge two datasets Handle missing val…

w https://git-scm.com/book/en/v1/Git-Internals-Plumbing-and-Porcelain Git is a content-addressable filesystem. Great. What does that mean? It means that at the core of Git is a simple key-value data store. You can insert any kind of content into it,…

https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html Introduction [相对于POSIX,放宽要求] The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It has many similarities…