Aug 01, 2014 · In that case this may happen as Spark Straming will clean up the raw data based on the DStream operations (if there is a window op of 15 mins, it will keep the data around for 15 mins at least). So independent Spark jobs that access old data may fail. By default, Spark creates one partition for each block of the file (blocks being 128MB by default in HDFS), but you can also ask for a higher number of partitions by passing a larger value. Note that you cannot have fewer partitions than blocks.
TorrentBroadcast is the default and only implementation of the Broadcast Contract that describes broadcast variables. TorrentBroadcast uses a BitTorrent-like protocol for block distribution (that only happens when tasks access broadcast variables on executors). 【前言：Spark目前提供了两种有限定类型的共享变量：广播变量和累加器，今天主要介绍一下基于Spark2.4版本的广播变量。先前的版本比如Spark2.1之前的广播变量有两种实现：HttpBroadcast和TorrentBroadcast，但是鉴于HttpBroadcast有各种弊端，目前已经舍弃这种实现，本篇文章也主要阐述TorrentBroadcast】广播 ...
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