PartitionOBucket级C 并DMerge-On-Rea- Mkh取 支持I量P取便于进一 步数RTransform I量h Apache Iceberg asic Data Metadata Database Table Partition Spec Manifest File TableMetadata Snapshot Current Table Version delete fileO 写T思l 1N5oFitioA ,elete File和nR SeD3umP大Qi己SeD3um 的,ata FileS 04I3M 2N-DualitJ ,elete File和n RSeD3um小Qi己SeD3um 的,ata FileS 04I3O 读取思l *CClJ ,eletioA *CClJ ,eletioA 5AnFDeNOSRTVU :1 :2 :3 f4 Ice4erg/Are3m1riAer Ice4erg/Are3m1riAer Ice4erg/Are3m1riAer 1 1riAe records Ao D3A3/DeleAe Files. F量文E集I1A4ns4cCion提D /4ACiCion-2 -cebeAg .eC4sCoAe /4ACiCion-1 /4ACiCion-3 -cebeAg D4C4 )enCeA

memory is dominated by the metaspace, the size of which is unlimited by default and holds class metadata as well as static content. There is a JIRA Ticket6 to limit the size to 250 megabyte by default can be configured7. • Mapped memory is usually close to zero as Flink does not use memory-mapped files. In a containerized environment you should additionally monitor the overall memory consumption of

applications • It keeps metadata about application execution, such as pointers to completed checkpoints. • A high-availability mode migrates the responsibility and metadata for a job to another JobManager consensus services, e.g. leader election • The JobManager writes the JobGraph and all required metadata, such as the application’s JAR file, into a remote persistent storage system • Zookeeper also restore, reads are sequential within each key-group, and often across multiple key-groups • The metadata of key-group-to-subtask assignments are small. No need to maintain explicit lists of key-groups

the elements of the window, and a Collector to emit results. • A Context gives access to the metadata of the window (start and end timestamps in the case of a time window), the current processing Exception; public abstract class Context implements Serializable { // Returns the metadata of the window public abstract W window(); // Returns the current processing time

Python Virtual Environment . . . . . . . . . . . . . . . . . . . 24 1.3.2.2 O2: How to add Python Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1.3.3 JDK issues . . . . . . . . . separate environment for each project. It is a directory tree which contains its own Python executable files and the installed Python packages. It is useful for local development to create a standalone Python 18 20:54 flink-dianfu-python-B-7174MD6R-1908. ˓→local.log Besides, you could also check if the files of the PyFlink package are consistent. It may happen that you have installed an old version of PyFlink

Python Virtual Environment . . . . . . . . . . . . . . . . . . . 24 1.3.2.2 O2: How to add Python Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1.3.3 JDK issues . . . . . . . . . separate environment for each project. It is a directory tree which contains its own Python executable files and the installed Python packages. It is useful for local development to create a standalone Python 18 20:54 flink-dianfu-python-B-7174MD6R-1908. ˓→local.log Besides, you could also check if the files of the PyFlink package are consistent. It may happen that you have installed an old version of PyFlink

TCP socket connection. ssc.socketTextStream("localhost", 9999) ▶ File stream • Reads data from files. streamingContext.fileStream[KeyClass, ValueClass, InputFormatClass](dataDirectory) streamingContext TCP socket connection. ssc.socketTextStream("localhost", 9999) ▶ File stream • Reads data from files. streamingContext.fileStream[KeyClass, ValueClass, InputFormatClass](dataDirectory) streamingContext

Kalavri
 vkalavri@bu.edu Spring 2020 1/28: Stream ingestion and pub/sub systems Streaming sources Files, e.g. transaction logs Sockets IoT devices and sensors Databases and KV stores Message queues

in fully dynamic streams with fixed memory size. TKDD 2017. https://www.kdd.org/ kdd2016/papers/files/rfp0465-de-stefaniA.pdf Further reading

ETL process complex fast and light-weight ETL: Extract-Transform-Load
 e.g. unzipping compressed files, data cleaning and standardization 6 Vasiliki Kalavri | Boston University 2020 1. Process events