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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm a newbie to Apache Spark and was learning basic functionalities. Had a small doubt.Suppose I have an RDD of tuples (key, value) and wanted to obtain some unique ones out of them. I use distinct() function. I'm wondering on what basis does the function consider that tuples as disparate..? Is it based on the keys, or values, or both? 回答1: .distinct() is definitely doing a shuffle across partitions. To see more of what's happening, run a .toDebugString on your RDD. val hashPart = new HashPartitioner( ) val myRDDPreStep = val myRDD =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to understand what merge and rebase do, in terms of set operations in math. In the following, "-" means diff (similar to taking set difference in math, but "A-B" means those in A but not in B and minus those in B not in A), and "+" means patch (i.e. taking disjoint union in math. I haven't used patch before, so I am not sure). From Version Control with Git, by Loeliger, 2ed The command git cherry-pick commit applies the changes introduced by the named commit on the current branch. It will introduce a new, distinct commit.

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Beginning programmer here, just wanting to understand the process behind Ruby's sort method when using the spaceship operator <=> . Hope someone can help. In the following: array = [1, 2, 3] array.sort { |a, b| a <=> b } ... I understand that sort is comparing a pair of numbers at a time and then returning -1 if a belongs before b , 0 if they're equal, or 1 if a should follow b . But in the case of sorting in descending order, like so: array.sort { |a, b| b <=> a } ... what exactly is happening? Does sort still compare a <=> b and then flip

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working with a locations database in CouchDB. I created a view where my key is an array with rounded values of latitude and longitude. Now I'm selecting with the following conditions: Startkey: [ 52.34, 4.883 ] Endkey: [ 52.37, 4.903 ] Here I expect that I'll only receive documents where the latitude is between 52.34 and 52.37. And the longitude between 4.883 and 4.903. The result I receive: [ 52.358, 4.919 ] [ 52.358, 4.919 ] [ 52.362, 4.861 ] [ 52.362, 4.861 ] [ 52.362, 4.861 ] As you may have noted, in the first result is the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When running an event loop in libuv using the uv_run function, there's a "mode" parameter that is used with the following values: UV_RUN_DEFAULT UV_RUN_ONCE UV_RUN_NOWAIT The first two are obvious. UV_RUN_DEFAULT runs the event loop until there are no more events, and UV_RUN_ONCE processing a single event from the loop. However, UV_RUN_NOWAIT doesn't seem to be a separate mode, but rather a flag that can be ORed with one of the other two values. By default, this function blocks until events are done processing, and UV_RUN_NOWAIT makes it

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Erlang version: R13B01 Currently I'm struggling trying to make Erlang work with SSL. The programming part was easy, but now starting the system SSL-enabled is not. Following the Erlang SSL documentation : 1 - Made the start_ssl.rel file {release, {"OTP APN 181 01","R13B01"}, {erts, "5.7.2"}, [{kernel,"2.13.2"}, {stdlib,"1.16.2"}, {sasl,"2.1.6"}, {os_mon,"2.2.2"}, {ssl,"3.10.3"}]}. 2 - Executed the following command 1> systools:make_script("start_ssl",[]). According to the documentation, running the shell would output this (this output is

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In this answer I wrote forceLayout() Call forceLayout() if you only want to relayout your own view's content, but don't need to trigger remeasuring of the entire view tree (all the parent views). If you had a custom ViewGroup that wasn't changing its own size but needed to remeasure and relayout its children, this would be an appropriate situation to call forceLayout() . Basically, calling requestLayout() results in a call to parent.requestLayout() , but calling forceLayout() doesn't. As I recall I wrote my answer by reading the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Possible Duplicate: Java: Instanceof and Generics I am trying to write a function which cast a generic List to specific type List. Find the code below public < T > List < T > castCollection ( List srcList , Class < T > clas ){ List < T > list = new ArrayList < T >(); for ( Object obj : srcList ) { if ( obj instanceof T ){ ... } } return list ; } But obj instanceof T showing a compilation error - Cannot perform instanceof check against type parameter T. Use instead its erasure Object >instead since further generic type information

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to get the FacesContext by calling FacesContext.getCurrentInstance() in the run() method of a Runnable class, but it returns null . public class Task implements Runnable { @Override public void run() { FacesContext context = FacesContext.getCurrentInstance(); // null! // ... } } How is this caused and how can I solve it? 回答1: The FacesContext is stored as a ThreadLocal variable in the thread responsible for the HTTP request which invoked the FacesServlet , the one responsible for creating the FacesContext . This thread usually

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have got a virtual private server with nginx Virtual Hosts setup (Server Blocks). I've installed Git and got my ssh keys authenticated with GitHub. I have my website running in ~/var/www/example.com/public_html/ I tried to run: git clone git@github.com:example/example.co.uk.git to pull my files on GitHub to the /public_html/ directory but I get the error: fatal: could not create work tree dir 'example.com'.: Permission denied I've followed this tutorial including the same issue he has mentioned on the page, but it still won't work: http:/