【互动问答分享】第6期决胜云计算大数据时代Spark亚太研究院公益大讲堂

“决胜云计算大数据时代”

Spark亚太研究院100期公益大讲堂 【第6期互动问答分享】

Q1：spark streaming
可以不同数据流 join吗？
Spark Streaming不同的数据流可以进行join操作；

Spark Streaming is an extension of the coreSpark API that allows enables high-throughput, fault-tolerant
stream processingof live data streams. Data can be ingested from many sources like Kafka, Flume,Twitter, ZeroMQ or plain old TCP sockets and be processed using complexalgorithms expressed with high-level functions like

map

,

reduce

,

join

and

window

join(otherStream, [numTasks])：When
called on twoDStreams of (K, V) and (K, W) pairs, return a new DStream of (K, (V, W)) pairswith all pairs of elements for each key.
Q2：flume
与 spark streaming 适合 集群模式吗？

Flume与Spark Streaming是为集群而生的；

For input streams that receive data over the network (suchas, Kafka, Flume, sockets, etc.), the default persistence level is set toreplicate the data to two nodes
for fault-tolerance.

Using any input source that receives datathrough a network -
Fornetwork-based data sources like Kafka and Flume, the received input data isreplicated in memory between nodes of the cluster (default replication factoris 2).

Q3：spark有缺点嘛？

Spark的核心缺点在于对内存的占用比较大；

在以前的版本中Spark对数据的处理主要的是粗粒度的，难以进行精细的控制；

后来加入Fair模式后可以进行细粒度的处理；

Q4：spark streming现在有生产使用吗？

Spark Streaming非常易于在生产环境下使用；

无需部署，只需安装好Spark，，就按照好了Spark Streaming；

国内像皮皮网等都在使用Spark Streaming；