From 1eb54787a4bd25439069400d39d1d4f16cfba8ff Mon Sep 17 00:00:00 2001 From: heibaiying <31504331+heibaiying@users.noreply.github.com> Date: Fri, 17 May 2019 15:21:20 +0800 Subject: [PATCH] =?UTF-8?q?Update=20Spark=E7=B4=AF=E5=8A=A0=E5=99=A8?= =?UTF-8?q?=E4=B8=8E=E5=B9=BF=E6=92=AD=E5=8F=98=E9=87=8F.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- notes/Spark累加器与广播变量.md | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/notes/Spark累加器与广播变量.md b/notes/Spark累加器与广播变量.md index e07094b..8336076 100644 --- a/notes/Spark累加器与广播变量.md +++ b/notes/Spark累加器与广播变量.md @@ -1,15 +1,16 @@ # Spark 累加器与广播变量 - - + + + ## 一、简介 -在Spark中,提供了两种类型的共享变量:累加器(accumulator)与广播变量(broadcast variable)。 +在Spark中,提供了两种类型的共享变量:累加器(accumulator)与广播变量(broadcast variable): + 累加器:用来对信息进行聚合,主要用于累计计数等场景; + 广播变量:主要用于在节点间高效分发大对象。