How to convert an object to json in Node.js?
How to convert general JavaScript objects to json in Node.js?
Assume jo is a JavaScript object, you can convert it to a json string by:
JSON.stringify(jo)
How to convert general JavaScript objects to json in Node.js?
Assume jo is a JavaScript object, you can convert it to a json string by:
JSON.stringify(jo)
How to efficiently archive a very large sparse file, say 1TB? The sparse file may contains a small amount of data, say 32MB. SEEK_HOLE and SEEK_DATA The SEEK_HOLE/SEEK_DATA functionalities play the trick and makes `tar` and `cp` handle the large sparse file very efficiently. `lseek` with `SEEK_HOLE` returns the offset of the start of the…
After a node failure and restarting the HDFS, the NameNode reports: “The reported blocks 1968810 needs additional 5071 blocks to reach the threshold 0.9990 of total blocks 1975856. Safe mode will be turned off automatically.” in the log. Why this happens? And how to fix it? About why the NameNode stays in the safe mode:…
readlink -m can get canonical file name by resolving every symlinks in every component of the given path recursively. In Python, the os.readlink() function does not do so. Any equivalent function in Python to the readlink -m command line? Specifically, it does: canonicalize by following every symlink in every component of the given name recursively,…
Suppose I have following branches harryxiyou@common_vm ~/forest/sqle/sqle/scripts $ git branch * dev-harry master rc After I did some changes on dev-harry branch, I wanted to merge dev-harry into rc branch. 1, git checkout rc 2, git merge dev-harry References:http://stackoverflow.com/questions/24147169/merge-two-remote-branches-in-githttps://www.atlassian.com/git/tutorials/using-brancheshttp://git-scm.com/book/en/v2/Git-Branching-Basic-Branching-and-Merging I usually add –no-ff during git merge to force git to add a commit for the…
Some entries in /etc/fstab may not not critical for booting Linux or even not available until Linux has booted. How to avoid the failures or unavailability of some mounting entries in /etc/fstab blocking the boot process of Linux? Please check the tutorial at Controlling Filesystem Mounting on Linux by Playing with /etc/fstab: Allow non-root users…
I host lost the password of my iPhone. How to erase or reset it? Check Forgot passcode for your iPhone, iPad, or iPod touch, or your device is disabled from Apple for how to reset the passcode. As all methods will erase your iPhone, the “Recovery mode” method may be the most easier and reliable…