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How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
...socket.io.js"></script>
<script src="/javascripts/jquery-1.4.3.min.js"></script>
</head>
<body>
<div id="content"></div>
<script>
$(document).ready(function() {
var socket = new io.Socket('localhost', {port: 3000,...
The way to check a HDFS directory's size?
...ted in 2.6.0:
hadoop fs -dus [directory]
Since 0.20.203 (dead link) 1.0.4 and still compatible through 2.6.0:
hdfs dfs -du [-s] [-h] URI [URI …]
You can also run hadoop fs -help for more info and specifics.
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Django DB Settings 'Improperly Configured' Error
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You can't just fire up Python and check things, Django doesn't know what project you want to wor...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
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edited Mar 16 '12 at 0:44
answered Feb 1 '12 at 8:22
Dav...
Best way to concatenate List of String objects? [duplicate]
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Your approach is dependent on Java's ArrayList#toString() implementation.
While the implementa...
How to find controls in a repeater header or footer
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edited Feb 6 '14 at 23:18
community wiki
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Count number of occurences for each unique value
...ommon entries are.
– Torvon
Dec 1 '14 at 16:25
5
@Torvon - sure, just use order() on the results....
Best algorithm for detecting cycles in a directed graph [closed]
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14 Answers
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Remove by _id in MongoDB console
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Very close. This will work:
db.test_users.deleteOne( {"_id": ObjectId("4d512b45cc9374271b02ec4f")});
i.e. you don't need a new for the ObjectId.
Also, note that in some drivers/tools, remove() is now deprecated and deleteOne or deleteMany should be used instead.
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Is there any difference between a GUID and a UUID?
...-20 Update: While GUIDs (as used by Microsoft) and UUIDs (as defined by RFC4122) look similar and serve similar purposes, there are subtle-but-occasionally-important differences. Specifically, some Microsoft GUID docs allow GUIDs to contain any hex digit in any position, while RFC4122 requires cert...