Python iterable Queue

I need to know when a Queue is closed and wont have more items so I can end the iteration. I did it by putting a sentinel in the queue: from Queue import Queue class...

Why do we need a sentinel character in a Suffix Tree?

Why do we need to append "$" to the original string when we implement a suffix tree?

Using sentinel-controlled loop

I'm having trouble with an exercise asking to have a user prompt a name and echoes that name to the screen until user enters a sentinel value. I understand this is a sentinel-controlled loop but...

How to setup a connection to Redis Sentinel using Jedis library?

How do I setup a connection to a Redis Sentinel server/cluster using the Jedis library?

Python-Multiple user inputs

I am trying to take user input multiple times on python and then taking its sum. Taking user input multiple times means i need a new variable each time to store the user input.I need a program...

Does Haskell have a takeUntil function?

Currently I am using takeWhile (\x -> x /= 1 && x /= 89) l to get the elements from a list up to either a 1 or 89. However, the result doesn't include these sentinel values. Does Haskell have a...

Dummy nodes in linked lists

Q: When are they used? (Homework question) 1st and last node in the list Sometimes used as 1st and last nodes in the list Never used as 1st and last nodes in the list Wikipedia says, A...

Input validation loop in java

How would I write an input validation loop and at least one other loop, either counter-controlled or sentinel-controlled. Could you help me how to write any type of code?

Strange styling through injected stylesheets in Chrome

We've just purchased a Primeface Theme&Layout Sentinel. However I've noticed a strange styling on tables in Chrome. The Table header and footer has an orange border. My colleagues don't see this...

Redis - Promoting a slave to master manually

Suppose I have [Slave IP Address] which is the slave of [Master IP Address]. Now my master server has been shut down, and I need to set this slave to be master MANUALLY (WITHOUT using sentinel...

Redis Sentinel master not downgraded to slave immediately

I have an architecture with three Redis instances (one master and two slaves) and three Sentinel instances. In front of it there is a HaProxy. All works well until the master Redis instance goes...

Delay container restart

I am using a ReplicationController to create a pod running redis container. The redis container is monitored by Redis Sentinel. And there is a problem, if redis crashed and restart too fast, it...

Laravel's Eloquent method getKey() returns the first number of the UUID

I have a User and a Role model extending Catalyst's Sentinel package. Everything works fine if I use the default incrementing primary key. When I change it to use UUIDs it acts weird. Everything...

Benefit of a sentinel node in a red black tree?

I created a doubly-linked list, and the benefits of a sentinel node were clear - no null checks or special cases at list boundaries. Now I'm writing a red black tree, and trying to figure out if...

How to create redis python client from sentinel url?

I have url as BROKER_URL = 'sentinel://192.168.10.1:26379/0;sentinel://192.168.10.2:26379/0;sentinel://192.168.10.3:26379/0' In this, redis is running on 192.168.10.1, 192.168.10.2 and...

Laravel Spatie/Laravel-activitylog with Sentinel

I'm using Sentinel for authorization on my Laravel project. Now i'm trying to add Laravel-activitylog from Spatie. Activity log uses default auth driver for logging user activity. How can i change...

SOLVED - Python: Passing a class member function to another class's callback

Can I pass class A into class B so that B can run a callback using A's member function? I'm trying to write a Python leg class for a robot I'm building. I'm using a Raspberry Pi as the main...

How to handle null values when writing to parquet from Spark

Until recently parquet did not support null values - a questionable premise. In fact a recent version did finally add that...

redis-sentinel throws error: " Can't resolve master instance hostname."

I'm starting up redis and sentinel nodes using the below configurations. I start the redis node first and when I start Sentinel, if fails with the error: sentinel_node | sentinel_node | *** FATAL...

Handling conditional logic + sentinel value with mypy

I have a function that looks roughly like this: import datetime from typing import Union class Sentinel(object): pass sentinel = Sentinel() def func( dt: datetime.datetime, as_tz:...

Package install inside a module in module base project in laravel

I am using a package nWidart/laravel-modules. No problem with installing this package but when I want to install Sentinel package It need to add $providers $ $aliases. where should import this?...

Exporting TFRecords training patches with Google Earth Engine (kernelSize issues)

I've been using GEE to export some training patches from Sentinel-2 to be used in Python. I could make it work, by following the GEE guide https://developers.google.com/earth-engine/tfrecord, and...

zero crossings: Layer error: Image.visualize: Cannot provide a palette when visualizing more than one band

I was trying to do some edge enhancement on sentinel-2 satellite image, but the problem is that the console keep stating that the layer 'Cannot provide a palette when visualizing more than one...

Spectral separability analysis Google Earth Engine

I need to carry out a classification using Sentinel 2 images, and for this, I need to perform a spectral separability analysis to select the best bands and vegetation indexes to use. So, I need to...

First element of array undefined

I try to calculate the mean and the variance value for 1000 and 2000 randomly distributed water and land pixels, respectively. Then I want to store the both mean values in a list called "means"...

Error: .select(...).sampleRegions is not a function - How to solve it?

I am trying to perform a supervised land cover classification from Sentinel SR images and get the following error: SR_2018.select(...).sampleRegions is not a function //import shapefile of study...

NOAUTH Authentication required spring-boot-data-redis+Realease Lettuce+Redis sentinel

when I restart redis cause java.util.concurrent.ExecutionException: io.lettuce.core.RedisCommandExecutionException: NOAUTH Authentication required. Why is this a problem use version like...

GEE supervised classification from Sentinel-2 with shapefiles

I am a beginner in GEE and I have a problem with making supervised classification from Sentinel-2 data. I used my pre-made shapefiles in five categories as training data. I tried more codes but...

Redis sentinel connection is timing out from nodeJS

Am trying to connect redis sentinel instance from nodeJS using ioredis. Am not able to connect redis sentinel instance despite trying multiple available options. We have not configured sentinel...

Is the const overload of begin/end of the range adapters underconstrained?

In C++20, some ranges have both const and non-const begin()/end(), while others only have non-const begin()/end(). In order to enable the range adapters that wraps the former to be able to use...