snapshot interview questions
Top snapshot frequently asked interview questions
does Amazon support any kind of automatic scheduled snapshots that can be configured for each single AMI/EBS?
my goal is to have each AMI backup itself regularly without relying on external scripts and similar.
Thanks
Source: (StackOverflow)
I have read that with dart your application can start up to 10x faster because of snapshots. Can anyone explain what it really is and how it works? In what kind of application would i be using snapshots?
Source: (StackOverflow)
What is the difference between a Snapshot Repository and Release Repository?
This is with reference to setting up Repositories (like Artifactory, Nexus etc)
Source: (StackOverflow)
I'm using SVN, Maven 3.0.3 on the latest version of Jenkins and the Maven Release plugin. I'm trying to use the Maven release plugin (through Jenkins) do a dry run and so am executing the options …
Executing Maven: -B -f /scratch/jenkins/workspace/myproject/myproject/pom.xml -DdevelopmentVersion=53.0.0-SNAPSHOT -DreleaseVersion=52.0.0 -Dusername=***** -Dpassword=********* -DskipTests -P prod -Dresume=false -DdryRun=true release:prepare
But the dry run is dying with the error below …
[JENKINS] Archiving /scratch/jenkins/workspace/myproject/myproject/pom.xml to /home/evotext/hudson_home/jobs/myproject/modules/org.mainco.subco$myproject/builds/2013-11-18_16-09-14/archive/org.mainco.subco/myproject/52.0.0/myproject-52.0.0.pom
Waiting for Jenkins to finish collecting data
mavenExecutionResult exceptions not empty
message : Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.0:prepare (default-cli) on project myproject: You don't have a SNAPSHOT project in the reactor projects list.
cause : You don't have a SNAPSHOT project in the reactor projects list.
Stack trace :
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.0:prepare (default-cli) on project myproject: You don't have a SNAPSHOT project in the reactor projects list.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:178)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:129)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:67)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.maven.plugin.MojoFailureException: You don't have a SNAPSHOT project in the reactor projects list.
at org.apache.maven.plugins.release.PrepareReleaseMojo.prepareRelease(PrepareReleaseMojo.java:219)
at org.apache.maven.plugins.release.PrepareReleaseMojo.execute(PrepareReleaseMojo.java:181)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 30 more
Caused by: org.apache.maven.shared.release.ReleaseFailureException: You don't have a SNAPSHOT project in the reactor projects list.
at org.apache.maven.shared.release.phase.CheckPomPhase.execute(CheckPomPhase.java:111)
at org.apache.maven.shared.release.phase.CheckPomPhase.simulate(CheckPomPhase.java:123)
at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:199)
at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:140)
at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:103)
at org.apache.maven.plugins.release.PrepareReleaseMojo.prepareRelease(PrepareReleaseMojo.java:211)
... 33 more
My SVN checkout method is set to "Always checkout a fresh copy" and I have a snapshot version in question in my snapshot repository, but not in my release repository. Is there a way I can get the "reactor projects list" to look at my snapshot repo?
Edit: I'm including the snippet of my pom where the project gets its version -- it inherits it from a parent
<parent>
<artifactId>subco</artifactId>
<groupId>org.mainco.subco</groupId>
<version>52.0.0</version>
</parent>
Source: (StackOverflow)
I can create snapshot in Xcode 6 this way as shown in below image:
But in Xcode 7 its not available and you can see that in below Image:
And control-command-S also doesn't work.
Can anybody tell me now how can I create a snapshot using Xcode 7?
Source: (StackOverflow)
i would like to release a snapshot project 'foo-1.0-SNAPSHOT' using the maven release plugin. The project depends on a 3rd party module 'bar-1.0-SNAPSHOT' which is not released yet.
I use the option 'allowTimestampedSnapshots' in my project's pom.xml to allow timestamped snapshots but i assume that the 3rd party module (bar) is not timestamped unless i build it myself as maven still complains about unresolved SNAPSHOT dependencies.
Is there a way to release the project foo regardless of dependent SNAPSHOT projects and if not how could i add a timestamp to the 3rd party project?
Source: (StackOverflow)
I transferred my redis snapshot (dump.rdb file) using scp to a remote server. I need to run a redis server on this remote and recover the data from the dump.rdb file. How can I do that?
Source: (StackOverflow)
We have a Nexus local repository manager which handles all our internal projects (as well as mirroring outside repositories). For our internal projects, we only keep the most recent version's snapshot builds. For example if we had ProjectX 1.0, 1.1 and 1.2-SNAPSHOT, as soon as 1.2 was released we would delete 1.2-SNAPSHOT and then have 1.0, 1.1, 1.2 and 1.3-SNAPSHOT in our Nexus repository.
The problem is that our Jenkins server has all the OLD snapshots in its local .m2/repository folder and continues to build projects successfully against these old snapshots, when in reality they should be failing (and our developers should be fixing their POM files.)
Can Maven be configured (in settings.xml or pom.xml) to delete these unwanted snapshots if they are not present in the Nexus repository?
If not, what's the best way to get rid of them? Jenkins configuration, cron job, other option?
Thanks...
Source: (StackOverflow)
I have a maven project with a snapshot dependency. How does maven know if the snapshot needs to be updated? Does it always update? Is it time based? A checksum based update? I know I can force an update but otherwise, how does it check?
thanks,
Jeff
Source: (StackOverflow)
How do we take container snapshots and load the snapshot in another docker host . I like to know the container snapshoting and not for image. I get confused with export/import and save/load commands in docker. I like to get more clarity or doc to understand them more deeply .
The snapshot to have the metadata to run the container and the roofs . The exact state to be there in the other docker host. Help in this direction would be great.
Source: (StackOverflow)
I have a problem when putting my iPhone app to background by pushing the exit button, and then relaunching by tapping the launch icon on the home screen: the app's view does return to its initial state like I want it to, but before that it flashes the earlier, wrong view state onscreen briefly.
Background
My main view consists basically of a sequence of interlinked UIAnimateWithDuration calls. The behavior I want whenever any interruption occurs, is to reset the animation to its initial state (unless the animations have all finished and the app has entered the static final phase), and start over from there whenever the app returns to active and visible state.
After studying the subject I learned I need two types of interruption handling code to provide good ux: "instant" and "smooth". I have the method resetAnimation that resets the view properties to the initial state instantly, and the method pauseAnimation that animates quickly to the same state, with an additional label stating "paused" fading in on the top of the view.
Double clicking exit button
The reason for this is the "double clicking exit button" use case, that actually does not hide your view or put you in the background state, it just scrolls up a bit to show the multitasking menu at the bottom. So, resetting the view state instantly in this case just looked very ugly. The animated transition and telling the user you're paused seemed like a better idea.
This case works nice and smootly by implementing the applicationWillResignActive delegate method in my App Delegate and calling pauseAnimation from there. I handle returning from that multitasking menu by implementing the applicationDidBecomeActive delegate method and calling from there my resumeAnimation method, that fades out the "paused" label if its there, and starts my animation sequence from the initial state.
This all works fine, no flickering anywhere.
Visiting flipside
My app's built over the Xcode "utility" template, so it has a flipside view to show info/settings. I handle visiting the flipside and returning back to the main view by implementing these two delegate methods in my main view controller:
I call my resetAnimation in the viewDidDisappear method and resumeAnimation in viewDidAppear. This all works fine, the main view is its initial state from the very beginning of the transition to visible state - no unexpected flashing of wrong animation states of anything. But:
Pushing exit button and relaunching from my app icon (the buggy part!)
This is where the trouble starts. When I push exit button once and my app begins its transition to background, two things happen. First, applicationWillResignActive gets called here too, so my pauseAnimation method launches also. It wouldn't need to, since the transition doesn't need to be smooth here – the view just goes static, and "zooms out" to reveal the home screen – but what can you do? Well, it wouldn't do any harm either if I just could call resetAnimation before the exact moment that the system takes the snapshot of the view.
Anyways, secondly, applicationDidEnterBackground in the App Delegate gets called. I tried to call resetAnimation from there so that the view would be in the right state when the app returns, but this doesn't seem to work. It seems the "snapshot" has been taken already and so, when I tap my app launch icon and relauch, the wrong view state does flash briefly on the screen before the correct, initial state shows. After that, it works fine, the animations go about like they're supposed to, but that ugly flicker at that relaunch moment won't go away, no matter what I try.
Fundamentally, what I'm after is, what exact moment does the system take this snapshot? And consequently, what would be the correct delegate method or notification handler to prepare my view for taking the "souvenir photo"?
PS. Then there's the default.png, which doesn't seem to only show at first launch, but also whenever the processor's having a hard time or returning to the app is delayed briefly for some other reason. It's a bit ugly, especially if you're returning to your flipside view that looks totally different from your default view. But this is such a core iOS feature, I'm guessing I shouldn't even try to figure out or control that one :)
Edit: since people were asking for actual code, and my app has already been released after asking this question, I'll post some here. ( The app's called Sweetest Kid, and if you want to see how it actually works, it's here: http://itunes.apple.com/app/sweetest-kid/id476637106?mt=8 )
Here's my pauseAnimation method – resetAnimation is almost identical, except its animation call has zero duration and delay, and it doesn't show the 'Paused' label. One reason I'm using UIAnimation to reset the values instead of just assigning the new values is that for some reason, the animations just didn't stop if I didn't use UIAnimation. Anyway, here's the pauseAnimation method:
- (void)pauseAnimation {
if (currentAnimationPhase < 6 || currentAnimationPhase == 255) {
// 6 means finished, 255 is a short initial animation only showing at first launch
self.paused = YES;
[UIView animateWithDuration:0.3
delay:0
options:UIViewAnimationOptionAllowUserInteraction |
UIViewAnimationOptionBeginFromCurrentState |
UIViewAnimationOptionCurveEaseInOut |
UIViewAnimationOptionOverrideInheritedCurve |
UIViewAnimationOptionOverrideInheritedDuration
animations:^{
pausedView.alpha = 1.0;
cameraImageView.alpha = 0;
mirrorGlowView.alpha = 0;
infoButton.alpha = 1.0;
chantView.alpha = 0;
verseOneLabel.alpha = 1.0;
verseTwoLabel.alpha = 0;
verseThreeLabel.alpha = 0;
shine1View.alpha = stars1View.alpha = stars2View.alpha = 0;
shine1View.transform = CGAffineTransformIdentity;
stars1View.transform = CGAffineTransformIdentity;
stars2View.transform = CGAffineTransformIdentity;
finishedMenuView.alpha = 0;
preparingMagicView.alpha = 0;}
completion:^(BOOL finished){
pausedView.alpha = 1.0;
cameraImageView.alpha = 0;
mirrorGlowView.alpha = 0;
infoButton.alpha = 1.0;
chantView.alpha = 0;
verseOneLabel.alpha = 1.0;
verseTwoLabel.alpha = 0;
verseThreeLabel.alpha = 0;
shine1View.alpha = stars1View.alpha = stars2View.alpha = 0;
shine1View.transform = CGAffineTransformIdentity;
stars1View.transform = CGAffineTransformIdentity;
stars2View.transform = CGAffineTransformIdentity;
finishedMenuView.alpha = 0;
preparingMagicView.alpha = 0;
}];
askTheMirrorButton.enabled = YES;
againButton.enabled = NO;
shareOnFacebookButton.enabled = NO;
emailButton.enabled = NO;
saveButton.enabled = NO;
currentAnimationPhase = 0;
[[cameraImageView subviews] makeObjectsPerformSelector:@selector(removeFromSuperview)]; // To remove the video preview layer
}
}
Source: (StackOverflow)
I'm looking for the right way to get an archive of a git repository without the .git/ directory in order to send a daily snapshot to testers.
Source: (StackOverflow)
When I define an updatePolicy in my maven settings it tells maven how often snapshot artifacts shall be downloaded.
If I set it to always it of course downloads every time all snapshots.
I was wondering what happens if I set it to the default value daily or another longer peroid.
Does maven still check whether a new version of the snapshot is available and if so, does it download it although the policy says daily ?
I'm looking for the correct settings to avoid redundant downloads and not to miss a newer snapshot out there.
Source: (StackOverflow)
I have a node.js (v0.6.12) application that starts by evaluating a Javascript file, startup.js. It takes a long time to evaluate startup.js, and I'd like to 'bake it in' to a custom build of Node if possible.
The v8 source directory distributed with Node, node/deps/v8/src, contains a SconScript that can almost be used to do this. On line 302, we have
LIBRARY_FILES = '''
runtime.js
v8natives.js
array.js
string.js
uri.js
math.js
messages.js
apinatives.js
date.js
regexp.js
json.js
liveedit-debugger.js
mirror-debugger.js
debug-debugger.js
'''.split()
Those javascript files are present in the same directory. Something in the build process apparently evaluates them, takes a snapshot of state, and saves it as a byte string in node/out/Release/obj/release/snapshot.cc (on Mac OS). This file seems to be baked into Node.
Some customization of the startup snapshot is possible by altering the SconScript. For example, I can change the definition of the builtin Date.toString by altering date.js. I can even add new global variables by adding startup.js to the list of library files, with contents global.test = 1.
However, I can't put just any javascript code in startup.js. If it contains Date.toString = 1;, an error results even though the code is valid at the node repl:
Build failed: -> task failed (err #2):
{task: libv8.a SConstruct -> libv8.a}
make: *** [program] Error 1
And it obviously can't make use of code that depends on libraries Node adds to v8. global.underscore = require('underscore'); causes the same error.
I'd ideally like a tool, customSnapshot, where customSnapshot startup.js evaluates startup.js with Node and then dumps a snapshot to a file, snapshot.cc, which I can put into the Node source directory. I can then build node and tell it not to rebuild the snapshot.
Source: (StackOverflow)
I've developed app that takes screenshot.
But it only takes snapshot of app. I want to take snapshot out of app.
I've researched answers but I don't find answer yet.
Here is my code.
View view = getWindow().getDecorView().getRootView();
view.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
saveImageToAppFolder(bitmap);
saveImagetoAppFolder is function that saves image to app folder.
That's not problem.
Is there anyway to take snapshot of screen?
Source: (StackOverflow)