Formatting code shortcuts in Eclipse
Formatting code shortcuts in Eclipse.
Shortcut: Ctrl + Shift + F
No need to select the code.
Formatting code shortcuts in Eclipse.
Shortcut: Ctrl + Shift + F
No need to select the code.
A file may be splitted to many chunks and replications stored on many datanodes in HDFS. Now, the question is how to find the DataNodes that actually store a file in HDFS? You may use the dfsadmin -fsck tool from the Hadoop hdfs util. Here is an example: $ hadoop fsck /user/aaa/file.name -files -locations -blocks…
The Xen solutions including installing and configuring Dom0 and DomU are summarized here. LVM volumes as backing for DomU’s file system is an appealing solution to Xen VBD. LVM volumes can dynamically grow/shrink and snapshot. These features make it simple and fast to duplicate DomU and adding storage to DomU. LVM backed DomU is recommended….
This is a tutorial on “how to delete all topics and posts from a user/spammer in myBB”. Please check out the answer. I use the Goodbye Spammer plugin for MyBB. First, install it after downloading the plugin form its homepage: Upload ./inc/plugins/goodbyespammer.php to ./inc/plugins/ Upload ./inc/languages/english/goodbyespammer.lang.php to ./inc/languages/english/ Go to ACP > Plugins > Activate…
In Hadoop 2.5.0, I use ‘ps -aux’ and find the Java process has options: -Xmx1000m However, my nodes have 32GB memory. How to make Hadoop Java process heap larger? In yarn-env.sh, you can find: # For setting YARN specific HEAP sizes please use this # Parameter and set appropriately # YARN_HEAPSIZE=1000 In hadoop-env.sh, you can…
OCaml is an interesting functional language. There are lots learning materials on the Internet. I compile a list of resources for OCaml learning and reference. Recommended OCaml learning and reference material Online book of Real World OCaml by Yaron Minsky, Anil Madhavapeddy, Jason Hickey. A very good tutorial by Jason Hickey: http://www.cs.caltech.edu/courses/cs134/cs134b/book.pdf. The OCaml system…
How to add an existing user to an existing group in Linux? We can use usermod to change/add user group for users. # usermod -a -G group_name user_name -a, –append Add the user to the supplementary group(s). Use only with the -G option. -G, –groups GROUP1[,GROUP2,…[,GROUPN]]] A list of supplementary groups which the user is…