Warsaw MuleSoft Meetup #12 Effective Streaming

31/03/2022
Warsaw MuleSoft Meetup Group
Effective Streaming in Mule 4

● Introductions & Community Updates
● Effective Streaming in Mule 4
● Quiz & Lottery
Agenda
2

● IT Expert at Roche
● More than 21 years of experience in IT
● MuleSoft Certifications: MCIA, MCPA, MCD
● Salesforce Certifications: Administrator, Platform App Builder,
Platform Developer I
● I like technology :)
https://www.linkedin.com/in/jacekbialecki/
5
Jacek Białecki
Speaker

● Subject Matter Expert at PwC Poland
● MuleSoft Ambassador
● MuleSoft Meetup Leader for Warsaw, Poland
● Working with MuleSoft products for over 10 years now
● One of Salesforce Trailblazers
https://trailhead.salesforce.com/trailblazers/patryk-bandurski
Organizer
Check out my integration blog
https://ambassadorpatryk.com/blog
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Share the event
● Share the Meetup in your social media
● Tag the event using
#MuleSoftMeetup
#WarsawMuleSoftMeetup
Thanks ☺
7

Lottery
● How it works?
○ During the event randomly is selected a winner
among the present attendees.
○ One winner at a time!
○ Three winners at the event
○ I will ask winners to send me Direct Message with
email address
● Prize is sponsored by
Three winners of today’s
lottery receives:
Amazon Voucher for 30$
8
Go to www.menti.com and use the code 9155 3697

MuleSoft Meetups
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11

All contents © MuleSoft, LLC
Effective Streaming in Mule 4

Agenda
● Introduction to Streams
● Streams in Mule 4
● DEMO
● Streaming in DataWeave
● DEMO
● Summary & performance considerations

Introduction to Streams

Concept of Streams
Scenario - read whole input to the memory

Concept of Streams
Scenario - read whole input to the memory
Problem: MEMORY CONSUMPTION
Out Of
Memory

Concept of Streams
Scenario – splitting files

Concept of Streams
Scenario - pagination
https://api.com/items?offset=200&limit=100

Concept of Streams
Scenario - read data as a stream

This is (also) a stream :)

Streams in Mule 4

Streams in MuleSoft 4:
● Non-Repeatable Streams (available in Mule 3)
● In-Memory Repeatable Stream (new in Mule 4)
● File-Stored Repeatable Stream (new in Mule 4)

Streams in MuleSoft 4: Non-Repeatable Streams
● Cannot be read more than once
● Cannot be consumed simultaneously
● Very performant but needs careful treatment
○ No additional memory buffers
○ No I/O operations (disk based buffers)
● Suitable for processing LARGE streams

Streams in MuleSoft 4: Non-repeatable Streams
● Cannot be read more than once (examples)

Streams in MuleSoft 4: Non-repeatable Streams
● Cannot be consumed simultaneously (example)

New in Mule 4: In-Memory Repeatable Stream

New in Mule 4: File-Stored Repeatable Stream
Uses KRYO serializer. Better than standard Java serializer but
still cannot serialize everything
A typical case is a POJO containing an
org.apache.xerces.jaxp.datatype.XMLGregorianCale
ndarImpl, which is in use in the NetSuite or Microsoft Dynamics
CRM connectors.
Only available in
Mule Enterprise
Edition (Mule EE)

Stream vs Iterable connectors
Stream Iterable
Connectors
• File
• FTP
• HTTP
• Sockets
• Database
• SalesForce

LIVE DEMO

Streaming in DataWeave

Could we build a solution
using DW and Non-Repeatable stream...?

Streaming in DataWeave
● DataWeave supports end-to-end streaming through a flow
● Speeds the processing of large documents without overloading memory
● When in deferred mode, DW passes streamed output data directly to next message processor
● The basic unit of the stream is specific to the data format.
○ a record in a CSV document
○ an element of an array in a JSON document
○ a collection in an XML document
● Streaming accesses each unit of the stream sequentially, it doesn't support random access to a
document
● Streaming is not enabled by default

Enabling Streaming in DataWeave
● streaming property, for reading source data as a stream (MIME Type section)

Enabling Streaming in DataWeave
● deferred writer property, for passing an output stream directly to the next message
processor in a flow

Streaming CSV in DataWeave
● Each row below the CSV header is a streamable record
Sample CSV:
name,lastName,age
mariano,achaval,37
leandro,shokida,30
pedro,achaval,4
christian,chibana,25
sara,achaval,2
matias,achaval,8
Sample DW script:
%dw 2.0
output application/json deferred=true
---
payload map (record) ->
{
FullName: record.lastName ++ "," ++
record.name,
Age: record.age
}

Streaming CSV in DataWeave
● Each row below the CSV header is a streamable record
Sample CSV:
name,lastName,age
mariano,achaval,37
leandro,shokida,30
pedro,achaval,4
christian,chibana,25
sara,achaval,2
matias,achaval,8
Sample DW script:
%dw 2.0
---
[payload[-2], payload[-1], payload[3]]
ERROR HERE

Streaming JSON in DataWeave
● The unit of a JSON stream is each element in an array
Sample JSON:
[
{
"firstName": "John",
"lastName": "Smith",
"age": "37"
},
{
"firstName": "Foo",
"lastName": "Bar",
"age": "30"
}
]
Sample DW script:
%dw 2.0
---
{
FullName: record.firstName ++ ","
++ record.lastName,
Age: record.age
}

Streaming XML in DataWeave
● XML is more complicated than JSON because
there are no arrays in the document
● To enable XML streaming the property
collectionPath has to be provided
<order>
<header>
<date>Wed Nov 15 13:45:28 EST
2006</date>
<customer
number="1">Joe</customer>
</header>
<order-items>
<order-item id="31">
<product>111</product>
<quantity>2</quantity>
<price>8.90</price>
</order-item>
<order-item id="31">
<product>222</product>
<quantity>7</quantity>
<price>5.20</price>
</order-item>
(...)
</order-items>
</order

Validate a Script using @StreamCapable()
● The @StreamCapable() validator checks a
script against the following criteria:
○ The variable is referenced only once.
○ No index selector is set for negative
access, such as [-1].
○ No reference to the variable is found in a
nested lambda.
● If all criteria are met, the selected data
is streamable
Sample DW script:
%dw 2.0
@StreamCapable()
input payload application/csv
---
{
// script here...
}

Let's summarize
● Non-Repeatable Streams
○ The input stream is read only once
○ No extra memory or performance overhead in comparison to repeatable streams
● Repeatable In Memory Streams
○ The default for the Mule Kernel (formerly called Mule Runtime Community Edition)
○ Uses a default max buffer size of 500 objects (Iterable) or 1024KB (binary)
○ The buffer is extended from the initial size until the max buffer size is reached
○ If the stream exceeds the max buffer size - the applications fails
● File-Stored Repeatable Stream
○ The default for Mule EE (and only available in Mule EE)
○ By default it store 500 objects (Iterable) or 512KB (binary) in it's memory buffer
○ If the stream exceeds the memory buffer then Kryo serializer writes data to disk

Performance considerations

Performance considerations
● Repeatable streams introduced in Mule 4 are a good compromise between
performance and convenience/robustness. It's not a coincidence that they are set
as defaults ;-)
● More most of the cases (input data relatively small) Repeatable streams should be
used as they hide the complexity of streams
● For large data (gigabytes or more) Non-repeatable streams should be definitely
considered as they provide exceptional good performance and low memory
consumption
● What about Batch Jobs?
● Once you decide Non-Repeatable streams will be used you have to ensure that:
○ The input stream is read only once
○ The input stream is not read simultaneously by multiple threads
○ Transform Message / DataWeave is used properly and supports streaming

Please remember:
Conduct proper
performance testing
before going to PROD!

THANK YOU :)

Trivia Quiz
● Remember!
○ The quicker you respond more point you earn
○ Only good answers count ☺
○ Only one voucher per winner per month
○ Training account with the given email
● Prize is sponsored by
Three winners of today’s
quiz receives:
Free voucher for MuleSoft
online training
47

Congratulation
● Congratulation to all the winners
○ of the Quiz
○ of the lottery
48

Share your knowledge
● Become a speaker and share your knowledge with our community
● Submit your idea via this form:
https://tinyurl.com/become-speaker
via email patryk.bandurski@gmail.com
or
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● Feedback:
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○ Contact MuleSoft at meetups@mulesoft.com for ways to improve the program
What’s next?
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Warsaw MuleSoft Meetup #12 Effective Streaming

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