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What should be the optimal value for spark.sql.shuffle.partitions or how do we increase partitions when using Spark SQL?

I am using Spark SQL actually hiveContext.sql() which uses group by queries and I am running into OOM issues. ... .sql() group by queries. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to hide the soft-key bar on Android phone?

When my app starts, I'd like to hide the soft keys bar (in red rectangle) to have a larger screen. ... with no hardware keys on phone front. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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527 views

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java - What is the Metadata GC Threshold and how do I tune it?

In an application I have the following -verbose:gc [GC (Metadata GC Threshold) 8530310K->2065630K(31574016K), 0.3831399 ... it didn't do this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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223 views

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How to access Spring-boot JMX remotely

I know that spring automatically expose JMX beans. I was able to access it locally using VisualVM. However on prod ... in addition? Thanks, ray. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Computing Standard Deviation in a stream

Using Python, assume I'm running through a known quantity of items I, and have the ability to time how long it ... keeping a record of each t? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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398 views

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user interface - How can I change the OverScroll color in Android 2.3.1?

Since Android 2.3.1 there is a new feature for ScrollViews and Lists called OverScroll. With android:overScrollMode= ... change the Color of it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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objective c - Give warning when [super method] is not called

When not using ARC, you get a warning when not calling [super dealloc] in your dealloc method. I'm trying to ... don't call super. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - How do I get csv file to download on IE? Works on firefox

I'm struggling with an odd error. I have a simple web app that grabs stuff from a DB then outputs it as a ... 2: The connection is over SSL. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to install virtualenv without using sudo?

I have easy_install and pip. I had many errors on my Linux Mint 12, I just re-installed it and I want to ... sudo? Or is there another way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Scientific notation colorbar in matplotlib

I am trying to put a colorbar to my image using matplotlib. The issue comes when I try to force the ticklabels ... any hint out there? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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Moving color key in R heatmap.2 (function of gplots package)

I read the heatmap.2 help manual a couple of times now, and also in various online tutorials I didn't ... 2 function from the gplots package. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - How do I restrict JSON access?

I have a web application that pulls data from my newly created JSON API. My static HTML pages dynamically calls the ... and not a remote user? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ssl - Android HttpClient and HTTPS

I'm new to implementing HTTPS connections in Android. Essentially, I'm trying to connect to a server using the ... there has any advice. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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143 views

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How to mask UIViews in iOS

I've seen similar questions, but haven't found workable answers. I want to mask a UIView using a grey image ... . Any clues will be appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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463 views

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iphone - iOS multitasking for an Audio Recording application

I am writing an application that records audio. I am looking into the feasibility of supporting multitasking while ... audio in the background? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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exception handling - Why use a JSF ExceptionHandlerFactory instead of <error-page> redirection?

All of the ExceptionHandlerFactory examples I have come across so far redirect a user to a viewExpired.jsf ... use an ExceptionHandlerFactory? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

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c++ - Creating Library with backward compatible ABI that uses Boost

I'm working on a certain C++ library (or more framework). I want to make it backward compatible with ... Boost BCP supports namespace renaming. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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515 views

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optimization - Efficient 4x4 matrix multiplication (C vs assembly)

I'm looking for a faster and trickier way to multiply two 4x4 matrices in C. My current research is focused ... my battle against the machine? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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224 views

1 answer

How to call a WCF service using ksoap2 on android?

Here is my code import org.ksoap2.*; import org.ksoap2.serialization.*; import org.ksoap2.transport.*; import ... types> what's the difference? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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609 views

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mocha.js - How to programmatically skip a test in mocha?

I have a code where certain tests will always fail in CI environment. I would like to disable them based ... mocha during the runtime execution? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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377 views

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Visual C++: How to disable specific linker warnings?

I'm using a library from CGAL which during the linking stage of my code compilation produces a lot of linking ... the messages at my end. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

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subclass - Reclassing an instance in Python

I have a class that is provided to me by an external library. I have created a subclass of this class. I also ... is meant to be very general. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Storyboards vs. the old XIB way

I am new to iOS and was wondering which is the best to learn. I have read some of the answers ... understand and will help with storyboards? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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213 views

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PHP constructor to return a NULL

I have this code. Is it possible for a User object constructor to somehow fail so that $this->LoggedUser ... User($_SESSION['verbiste_user']); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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Hibernate: More than one row with the given identifier was found error

I'm using spring 4.0.5 and hibernate 4.3.5; I'm facing an error ... 98) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(Transactio...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

1 answer

java - How can I disable IPv6 stack use for IPv4 IPs on JRE?

As you can see on below screenshots, eclipse and Android SDK Manager (and other Java programs) are trying to ... can disable IPv6 in Java? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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233 views

1 answer

How to move or copy files listed by 'find' command in unix?

I have a list of certain files that I see using the command below, but how can I copy those files listed into another ... 1 -exec du -hc {} + See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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425 views

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ios - EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose

I am getting EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose but don't really know how to ... }); }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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