recovery

Git: failed to read object … Invalid argument

由 扶醉桌前 提交于 2019-12-12 17:22:46
问题 I had this git message after a forced VM shutdown, which obviously corrupted the git index Git: Failed to read object abcdef.... Invalid argument I looked at these existing answers Restore a corrupted index Recover damaged git by HD failure None seemed to work. 回答1: Using @Arindam's answer above didn't work for me, but a variation of it did, I hope someone else finds it useful: At this point you're in GIT limbo. You can't checkout a new branch with the state of the current branch, likely

ceph的数据存储之路(8) -----pg 的数据恢复过程

由 a 夏天 提交于 2019-12-12 11:38:22
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 2016-10-26 更新start—————————————————————————————————————— 感谢 大水牛提出的疑问：对与本文中第二节，OSD恢复时常用的基本概念解析中对acting和up集合的描述问题，在研究ceph之初的时候我也不太懂acting和up集合的区别，然后查看资料从博客 http://blog.csdn.net/changtao381/article/details/49125817 引用了这部分概念的解释，也感谢这位博主的努力和付出。在这里面对acting和up集合的解释确实出现了一点点的小纰漏。这里更正一下。 当@大水牛这位大神提出了对acting和up集合的质疑，然后我去查找了之前自己在分析ceph时抓取的一些log，去分析一下 acting和up集合。 log抓取的时机：杀掉一个osd.0进程,再重新启动这个进程，然后分析他的log，在这个log里加了一些日志供分析。截取部分日志如下： 7fba68b79700 10 osd.0 pg_epoch: 27 pg[0.0( v 9'2 (0'0,9'2] local-les=26 n=1 ec=1 les/c 26/26 24/25/24) [2,1]/[2,1,0] r=2 lpr=25 pi=22-24/2 luod

Why does Aries perform a redo before undo in database management recovery?

由 早过忘川 提交于 2019-12-12 09:57:28
问题 Why does Aries algorithm apply a redo before an undo if it already knows what transactions to undo after the analysis phase? I know(think) it has something to do with the Lsn numbers and maintaining consistency in the sense that undoing a transaction given that the data flushed on disk may not be the same as undoing a transaction at the time of the crash (due to dirty pages), but I can't find any sort of 'formal' answer to this question (at least one that I can understand). 回答1: Because there

Handling panics in go routines

由 一曲冷凌霜 提交于 2019-12-12 06:48:58
问题 I understand that to handle panic recover is used. But the following block fails to recover when panic arises in go routine func main() { done := make(chan int64) defer fmt.Println("Graceful End of program") defer func() { r := recover() if _, ok := r.(error); ok { fmt.Println("Recovered") } }() go handle(done) for { select{ case <- done: return } } } func handle(done chan int64) { var a *int64 a = nil fmt.Println(*a) done <- *a } However following block is able to execute as expected func

Recover overwritten .py file overwitten using Spyder

由 依然范特西╮ 提交于 2019-12-11 15:39:13
问题 I know I should have used version control but I have accidentally overwritten a script (.py file) by saving another script with exactly the same name while using Spyder. Is there any way at all this can be recovered? 回答1: Once the file has been compiled to a pyc it is lost. If you still have the old pyc file you may be able to decompile it: Is it possible to decompile a compiled .pyc file into a .py file? 来源： https://stackoverflow.com/questions/54675041/recover-overwritten-py-file-overwitten

Corrupt NTFS folder not accessible from either Windows, Mas OSX or Linux [closed]

由 此生再无相见时 提交于 2019-12-11 13:29:42
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I have an external 2TB hard drive with a large number of video files from GoPro and a Sony Handycam as well as other backed up content. Recently while attempting to backup from my Mac (using a bit of a hack via OSXFUSE to allow writing to a NTFS filesystem which had been working for me up until now) I found one

Parse - Recover deleted rows

由 感情迁移 提交于 2019-12-11 12:45:32
问题 If we delete all the rows in a table by mistake (!) on Parse, is there a way to recover from it at all? Are there automatic backup's that we can restore from? 回答1: Parse itself does not have tools for recovery of deleted items. Once you delete something, it is gone. However, if you click Settings, there is an option on the left called "Export Data", which will email you a zipped JSON file with all of your data. I recommend that you do this regularly. Then, if you somehow accidentally delete

How do you restore from a old __jb_bak__ or __jb_old__ file

由 穿精又带淫゛_ 提交于 2019-12-11 05:34:04
问题 How can one get the backed up file from an old jb_bak or jb_old intellij file. I recently found the jb_bak of a deleted file(.java) which wasn't recoverable using Local History how can I get this file back to its original state from the jb_bak 回答1: Just change the extension of the file to the required one. If it is a backup of .java , changing the extension to .java should work. These files are produced by safe write, when IntelliJ first saves contents to a temp file and then renames it. 回答2:

Recover unreferenced commits from remote git repository

由 做~自己de王妃 提交于 2019-12-10 13:23:31
问题 Here's the situation : some commits have been done in a remote repository. Unfortunately, someone did push -f such that no remote branch references these commits anymore. To make matters worse, I don't have those commits in my local clone. My goal is basically to recover those commits. These are some of the things I tried : git checkout -b recovery <commit_id> : fatal: reference is not a tree git push origin <commit_id>:recovery error: refs/heads/recovery does not point to a valid object!

Recover files from apk Google Play

由 混江龙づ霸主 提交于 2019-12-10 12:23:56
问题 Some time ago i uploaded to google play an app for my family restaurant which was something like showing the menu, timetable, prices..all that stuff. It's still in the google play and i have access to it by google developers but the problem is that i lost all the code. Is there any way of recovering the data to add some new info and then update my app? Thank you a lot. 回答1: You'll need a rooted device for this: Install the app to your device, and then take the apk off of the device using:
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