(spark.readStream.table("events").groupBy("customerId").count().writeStream.outputMode("complete").option("checkpointLocation","/tmp/delta/eventsByCustomer/_checkpoints/").toTable("events_by_customer")) The preceding example continuously updates a table that contains the aggregate number of even...
结构化流式处理以增量方式读取 Delta 表。 当流式处理查询针对 Delta 表处于活动状态时,新表版本提交到源表时,新记录会以幂等方式处理。下面的代码示例演示如何使用表名或文件路径配置流式读取。PythonPython 复制 spark.readStream.table("table_name") spark.readStream.load("/path/to/table") ...
以下示例代码从示例 NYC 出租车行程数据集创建 Delta 表,筛选为包含大于 10 美元的票价的行。 在以下项中添加或更新新行时,不会更新 samples.nyctaxi.trips此表:Python 复制 filtered_df = ( spark.read.table("samples.nyctaxi.trips") .filter(col("fare_amount") > 10.0) ) filtered_df.write.saveAs...
A FileReadException error occurs when you attempt to read from a Delta table. The underlying data has been deleted, or the storage blob was unmounted during a write.Written by Adam Pavlacka Last published at: February 23rd, 2023 Problem You attempt to read a Delta table from mounted storage...
将Delta 的内容复制到另一个位置后,使用代替 时,上述查询速度提高了 60 倍(即在同一集群上需要0.5 秒) 。这是复制增量的命令:NEW_PATHPATH_TO_THE_TABLE(spark.read.format("delta").load(PATH_TO_THE_TABLE).write.format( "delta" ) .mode("overwrite").partitionBy(["DATE"]).save(NEW_PATH)) Run...
用作源的 Delta 表 结构化流式处理以增量方式读取 Delta 表。 当流式处理查询针对 Delta 表处于活动状态时,新表版本提交到源表时,新记录会以幂等方式处理。 下面的代码示例演示如何使用表名或文件路径配置流式读取。 Python Python复制 spark.readStream.table("table_name") spark.readStream.load("/path/to/...
FileReadExceptionerrors occur when the underlying data does not exist. The most common cause is manual deletion. If the underlying data was not manually deleted, the mount point for the storage blob was removed and recreated while the cluster was writing to the Delta table. ...
使用DataFrameReader选项,您可以通过Delta table中一个固定的特定版本表创建DataFrame。 Python %pyspark df1 = spark.read.format("delta").option("timestampAsOf",timestamp_string).load("/mnt/delta/events") df2 = spark.read.format("delta").option("versionAsOf",version).load("/mnt/delta/events") ...
这个就是Delta lake的实现，Apache Hudi和Iceberg有很类似的实现。这一实现的好处就是用户只需要读...
%sql --创建数据库 CREATE DATABASE IF NOT EXISTS table_store; USE table_store; --创建表 DROP TABLE IF EXISTS delta_order_source; CREATE TABLE delta_order_source USING tablestore -- 配置项信息链接tablestore,定义schema OPTIONS( endpoint="your endpoint",access.key.id="your akId",access.key.sec...