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.
The download page of Hadoop http://hadoop.apache.org/releases.html only contains several recent release packages. I would like to download some old release packages such as Hadoop 2.5.0 which is not available anymore on the release page. Where to download a copy of the old release? You can download the old release packages of Hadoop on the http://archive.apache.org…
How to get the value of a default value if the key does not exist in dict() in Python? We can use the get() function to assign default value if the key does not exist in the dict yet. dict.get(key[, default]) Example as follows. msges = {“msg”: “Hello, World!”} msg = msges.get(“msg”, “”) print(msg) #…
In a Linux system, we may have multiple kernels installed. Usually, it is the latest kernel configured to be the default one the system boot loader will use during automatic boot if there is no manual kernel choosing. In many cases, such as there is no driver ready yet for some devices in newer kernels,…
How to reset the Disqus WordPress plugin installation? After deactivating/activating the Disqus WordPress plugin, the ID and others are the same as the old ones. What I need is to change the Disqus forum ID for a WordPress installation. Find all the tuples in the _option table of WordPress that contains “disqus” and delete them….
When uploading a file by the hdfs dfs -put command line in HDFS, how to set a replication factor instead of the global one for that file? For example, HDFS’s global replication factor is 3. For some temporary files, I would like to save just one copy for faster uploading and saving disk space. The…
The HDFS has a configuration in hdfs-site.xml to set the global replication number of blocks with the “dfs.replication” property. However, there are some “hot” files that are access by many nodes. How to increase the number of blocks for these certain files in HDFS? You can the replication number of certain file to 10: hdfs…