MongoDB for a High Volume Logistics Application. Santa Clara, California April 23th 25th, 2018
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1 MongoDB for a High Volume Logistics Application Santa Clara, California April 23th 25th, 2018
2 about me... Eric Potvin Software Engineer in the performance team at Shipwire, an Ingram Micro company, in Sunnyvale, California
3 A little background
4 who are we? We offer a cloud-based fulfillment software platform This platform enables thousands of brands and online retailers to manage their order fulfillment operations We support 20+ warehouses in multiple countries like USA, Canada, Australia, Italy, Germany and China
5 warehouses are old-fashioned Some warehouses are unable to easily adapt their systems to new technologies Warehouses are using old infrastructure; aka servers (AS/400) or service providers Warehouses understands files and FTP
6 what we have to deal with Millions of files received monthly Gigabytes of various document file types (XML, TXT/CSV, PDF) Limitations on file received (raw zip files vs zip files) Limitations of FTP connections
7 lots of data to maintain 8 processing servers Ingesting millions of files per month Thousands of log files 100+ GB of monthly logs / 250+ GB of data files
8 server resources & limitations By manipulating so many files, we are suffering from high server resources consumptions - Lots of processes with constant high CPU usage - Each processes has high RAM usage, - And high network usage - GBs of data transferred hourly
9 searching for information can be tedious Often, we need to look for data in case of errors or a common we didn t receive these files Data and logs are not available for users Finding information requires an engineer to connect to each server
10 what about... NFS? This will eliminate the lookup across servers but still have some issues: - Still large amount of files - Network overhead for large files - And -bash: /bin/ls: Argument list too long MySQL - Changing data structure requires maintenance
11
12
13 so why did we choose MongoDB?
14 get all data at no cost? Analytics software are great and allow any user to see data But they can be costly and limited MongoDB gives the flexibility to save what we need With no monthly or setup fee
15 better integrations All data can now be visible by all users Can be integrated with our in-house applications Self-service tool allow users to take actions immediately in case of issues Accurate real-time tracking of documents Real-time monitoring of documents, server resources
16 no more frequent reads/writes No more slow CRUD operations on an XML file on disk Avoid millions of disk and memory operations It also make our code healthier
17 simplified code From: Document doc = db.parse(<my_file>); Element elem = doc.getdocumentelement(); NodeList nl = elem.getelementsbytagname(<child>); for(int i = 0; i < nl.getlength(); i++) { To: mongoclient.getdatabase(mydatabase).getcollection(mycollection).find(search).projection(whatineed) NodeList node = (Element)nl.item(i).getElementsByTagName(<tag>); for(int j = 0; j < node.getlength(); j++) { // and update later collection.update(search, datatoupdate); // fetch data for what I need // and update later
18 available for everyone and instantly Now all our apps can access MongoDB Microservices can access the same data without delay Data is available instantly, even after multiple manipulations
19 another ALTER? seriously?... No more system under maintenance because we need to alter a big table No need to care about schema update due to a warehouses updated file And no need to store the entire content in a blob and try to search within
20 where is my data? Can access data using a single point of access (all depends which secondary I am reading from) Faster data access with multiple secondaries No more file locked and waiting for unlock...
21 server goes down, no big deal Election process is fantastic! No more down time due to single points of failure Easy to expand and/or upgrade
22
23 How did we reduce server resource usage?
24 example of manipulating a single order 1 order from Chicago, USA to Québec City, Canada using an international carrier, 1 product ordered. This requires at least 7 XML files and 3 PDF files to be created
25 shipping confirmation example This files contains multiple nodes giving details about shipping details - Tracking numbers - Number of boxes shipped - Carrier including details - etc... File size can be up to few Megabytes
26 nested loops of O(n*r)? Looping through few Megabytes file is slow - Each loop calls API and update database records What if the process crashed, where to start from? - Manual recovery Constant server monitoring resources
27 iterations (what we used to have) Open the entire file in memory Loop through each record, For each record loop through each box shipped For each box shipped, Loop through each product (quantity shipped, reason if not shipped)
28 Enough! let s keep this simple: O(1)
29 no more loops... Save the data we only care about - Our own standard format using Kilobytes of data Higher efficiency of searching documents - One simple document, one single query
30 Stateful resource keep track of data changes inside the document No more intensive memory and disk usage due to multiple file manipulations Real-time manual change from a UI by any user
31 Fault tolerant MongoDB gives us persistent data (server reboot, segmentation fault, etc ) Eliminates memory issues when reading multiple large text file in memory Free up resources for other applications running on the same server
32 server resources This result in very low resource usage processes CPU percentage and load went down drastically Network usage dropped considerably
33 disk utilization No more -bash: /bin/ls: Argument list too long Lots of free space reused for something else No more frequent cleanup or disk maintenance No more file archiving/maintenance to a backup server No more disk at 95% utilization alerts
34 Let s see a simple example
35 Application logs
36 application logs (what we used to have) Each application logs its data to their own specific files Each log uses different log level based on what is executed CRIT (0), ERR (1), WARN (2), INFO (3), DEBUG (4) Logs are saved with following format in /var/log/my_application/my_app.log T03:50:02-08:00 [ INFO / 3 ] (PID: 12345): My message
37 application log (search) To search, we simply need to run: for x in $(seq 1 8); do ssh "p$x.myserver" grep -r "my search" /logs/app/* ; Done wait and wait
38 no more! let s fix this
39 logging in MongoDB Each application logs its data to their own specific namespace Database used: <application_name> Collection used: <application_specific> Example: warehouse.sending_files
40 logging in MongoDB (example) { datetime : date: ISODate(), level : INFO, code :3, pid : 12345, message : file orders_1234.zip sent to /inbound/ }
41 MongoDB log (search) use logs; db.my_app.find(); db.my_app.find({level: INFO }); db.my_app.find({message: /some specific data/);
42 archiving logs Archiving data can be done by using the TTL index Warning: ttl index runs every 60 seconds on all namespaces and records to identify which records needs to be removed. This can slow down data access. Another way is to create a daemon that generates yearly or monthly collections. Then, use the mongodump to archive the records.
43
44 So What can MongoDB do for you?
45 Q+A?
46 Thank You!
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