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Hadoop Default Ports
ByEric MaHadoop’s namenode and datanodes expose a bunch of TCP ports used by Hadoop’s daemons to communicate to each other or listen directly to users’ requests. These ports information are needed by both the Hadoop users and cluster administrators to write programs or configure firewalls/gateways accordingly. A post written by Philip Zeyliger from Cloudera’s blog summarizes the…
Disable WordPress Built-in Canonical URL link tag in HTML head
ByQ AThe built-in canonical URL function since WordPress 2.9 is great. But under some situation, it is not needed. For example, all the Mingle Forum threads’ canonical URL is set to the URL of the page that contains the [mingleforum] shortcode, which, of course, is wrong. How to diabled it? We can disabled WordPress’s Built-in Canonical…
How to hard reset an Amazon Kindle
ByQ AHow to hard reset an Amazon Kindle 5? First, press and hold the power button for 30 seconds. Second, release the power button and wait for the kindle to restart. After a while, the progress bar appear and kindle is rebooting. Read more: Should I buy a Kindle paperwhite or regular Kindle? How to delete…
C++ cout formatting output
ByQ AHow to format outputs with cout in C++? You need IO Manipulators <iomanip>: Header providing parametric manipulators. There are also good tutorials on the Web: Output Formatting: http://arachnoid.com/cpptutor/student3.html Formatting Cout Output in C++ using iomanip: http://www.cprogramming.com/tutorial/iomanip.html Read more: Formatting code shortcuts in Eclipse How to get the output of a system command in C How…
How to write /etc/fstab entry for –bind mounting?
ByEric MaHow to write /etc/fstab entry for –bind mounting like mount –bind /home/hadoop/hdfs/store-tmp /home/store/tmp From man 8 mount: Since Linux 2.4.0 it is possible to remount part of the file hierarchy somewhere else. The call is mount –bind olddir newdir or shortoption mount -B olddir newdir or fstab entry is: /olddir /newdir none bind Read more:…
How to find the number of files in each directories on Linux?
ByEric MaHow to find the number of files in each sub-directories of a directory on Linux? For example, . ├── a19 ├── a8 ├── d2 ├── ecfddd └── t1 The number of sub-directories can be quite large. How to find the number of files in each sub-directories here? You can use this piece of script to…