storage

Why are Spark Parquet files for an aggregate larger than the original?

由 荒凉一梦 提交于 2019-11-27 09:08:43
I am trying to create an aggregate file for end users to utilize to avoid having them process multiple sources with much larger files. To do that I: A) iterate through all source folders, stripping out 12 fields that are most commonly requested, spinning out parquet files in a new location where these results are co-located. B) I try to go back through the files created in step A and re-aggregate them by grouping by the 12 fields to reduce it to a summary row for each unique combination. What I'm finding is that step A reduces the payload 5:1 (roughly 250 gigs becomes 48.5 gigs). Step B

Scalable Image Storage

由 走远了吗. 提交于 2019-11-27 08:57:54
问题 I'm currently designing an architecture for a web-based application that should also provide some kind of image storage. Users will be able to upload photos as one of the key feature of the service. Also viewing these images will be one of the primary usages (via web). However, I'm not sure how to realize such a scalable image storage component in my application. I already thought about different solutions but due to missing experiences, I look forward to hear your suggestions. Aside from the

Android getting external storage Absolute Path

由 痴心易碎 提交于 2019-11-27 08:43:57
I want to download some files and save them into the internal storage of the phone/tab. Tried on Samsung Galaxy Note 2 and Galaxt Tab 10.1. When I use /storage/sdcard0/ on them the code runs successfully but when I use Galaxy Nexus 3 the code fails. I want to get absolute path of the phoe or tab's internal storage' Absolute Path . Does it possible, if so how? When I use /storage/sdcard0/ on them the code runs successfully but when I use Galaxy Nexus 3 the code fails. /storage/sdcard0/ is not internal storage. It is external storage. (BTW, since there is no device named "Galaxy Nexus 3", I am

Can't access the secondary storage (the external removable micro sd card)

由 落爺英雄遲暮 提交于 2019-11-27 08:43:43
问题 Please read my question introduction before reading the real question: In Android there are an internal storage and an external storage . Don't be confused, because the internal storage relates to files that are accessible only by the app, and the external storage relates to normal files that can be accessed by all apps and can be found both in the real internal storage card (the phone's sd card) and in the real external storage card (the removable micro sd card). My path of the phone's sd

Reading a file line by line in C

由 旧城冷巷雨未停 提交于 2019-11-27 08:25:37
问题 I am trying to write some code that will open a file, read its content line by line and store each of these lines into an array. First I open the file and count the number of lines, each of the lines is of a fixed length so I simply do this : char buf2[LINE_LENGTH]; int in2 = open("toSend2", O_RDONLY); int number_of_lines = 0; for (;;) { char* p2 = buf2; int count = read (in2, p2, LINE_LENGTH); if (count < 0) { printf("ERROR"); break; } if (count == 0) break; number_of_lines++; printf("count:

Chrome extension store large amounts of data

由 馋奶兔 提交于 2019-11-27 08:11:12
问题 I'm looking for an efficient way to store large amounts of data in my chrome extension. I've got a few txt files which are around 1-2mb. I'd like my chrome extension to 'cache' them locally so I don't need to fetch them every time. I've found syncFileSystem but this is only available for packed apps. There were warnings when trying to install this extension: 'syncFileSystem' is only allowed for packaged apps, but this is a extension. What is the best way to store this sort of data in a chrome

how to remove data from a object using chrome storage?

由 非 Y 不嫁゛ 提交于 2019-11-27 08:01:46
问题 i have an object stored inside chrome storage that looks like this: { "planA": { 123: {key: 'some key'} 124: {key: 'some other key'} }, "planB": { 223: {key: 'some key'} 234: {key: 'some other key'} } } i want to do something like chrome.storage.sync.remove([{"planA": "123"}]); but that seems not to work Error in response to storage.get: Error: Invalid value for argument 1. Value does not match any valid type choices. from the documentation StorageArea.remove(string or array of string keys,

How to get my Android device Internal Download Folder path [duplicate]

由 故事扮演 提交于 2019-11-27 07:28:33
This question already has an answer here: how to access downloads folder in android? 4 answers It is possible to get the Android device Internal Download Folder path? Dinithe Pieris if a device has an SD card, you use: Environment.getExternalStorageState() if you don't have an SD card, you use: Environment.getDataDirectory() if there is no SD card, you can create your own directory on the device locally. //if there is no SD card, create new directory objects to make directory on device if (Environment.getExternalStorageState() == null) { //create new file directory object directory = new File

Get databases directory for my app programmatically

由 筅森魡賤 提交于 2019-11-27 06:42:42
问题 I want to use a "pre loaded" database in my app. There are tons of questions about this and most point to this blog article here or similars. So far so good. I just want to know if there is a better way to get the default databases directory so you don't have to use something like this: private static String DB_PATH = "/data/data/YOUR_PACKAGE/databases/"; I mean, maybe that is changed in the future or maybe a device or rom could place it elsewhere... so is there a way to get this path

Accessing storage of simulator/device while debugging

由 落花浮王杯 提交于 2019-11-27 06:26:26
问题 I created an UWP project, where I store a file in the cache directory: string writeFilePath = Path.Combine(ApplicationData.Current.LocalCacheFolder.Path, "test.jpg"); await Task.Run(() => File.WriteAllBytes(writeFilePath, image)); Now I want to view the saved image, but I have no access to it. How do I access it from the simulator or directly on the device (Windows 10 Mobile phone)? Perhaps one could copy the file from the device to the local PC? I tried the IsolatedStorageExplorer, but I
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