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Ubuntu What if the clock applet disappears

Sometimes the clock applet just disappears. All you have to do to bring it back is to type this in the terminal:

 killall unity-panel-service 

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Ubuntu 16 10 Available For Download See What s New

Unity / Compiz changes in Ubuntu 16.10

Unity and Compiz changes in Ubuntu 16.10 (Yakkety Yak):

• low graphics mode improvements:
• reduced animations in the window switcher, launcher and menus (in some cases to zero);
• disabled blur and fade in/out;
• reduced shadows;
• Also, even if youre not using the low graphics mode, theres now an option to to skip animation in the Expo, Scale, and Show Desktop Compiz plugins;
• More about the improved low graphics mode in Unity 7, HERE.
• bottom launcher:
• properly decorate launcher/panel when the launcher is at the bottom;
• Expo and Scale Compiz plugins now support buttom offsets, fixing some issues that were occuring when the Unity launcher is used at the bottom of the screen, such as the Workspace Switcher icon switching workspaces;
• the top panel and launcher now have an outline in spread mode;
• middle-clicking an app icon in the switcher now closes the app window
• properly partially unmaximize a window when middle/left clicking in the restore button on the Unity panel;
• scrolling on indicators should now work when Expo is active;
• HiDPI fixes: the switcher detail view is now properly scaled and the xy_offset is now also scaled to make sure the switcher and launcher dont overlap;
• re-added Animations Experimental, Animations Plus, Simple Animations, and Animations Addon Compiz plugins (these are available with the "compiz-plugins" package, not installed by default);
• various other improvements and bug fixes.

Ubuntu 16.10 Defaults

Changes in GNOME 3.20 include:

• a shortcuts window was added to some GNOME applications (apps that support this include Files, Videos, etc. );
• Files (Nautilus) uses revamped search filters, a faster and more responsive search, a new, more compact preferences dialog, and more;
• dconf Editor now uses a header bar, with a standard search design, redesigned entry editor, and other improvements;
• GTK+ CSS theming has had a major overhaul, which should result in easier theme writing and more dynamic interfaces;

Files (Nautilus) 3.20.3 search filters in Ubuntu 16.10

A shortcuts window (for Files) in GNOME 3.20, under Ubuntu 16.10

For a complete GNOME 3.20 overview, see THIS page.

• Linux 4.5 (more information: KernelNewbies | Phoronix):
• experimental PowePlay support for the amdgpu driver for discrete GPUs Tonga and Fiji, and integrated APUs Carrizo and Stoney;
• initial i915 DRM graphics support for Kabylake hardware;
• Linux 4.6 (more information: KernelNewbies | Phoronix):
• initial acceleration support for NVIDIA GeForce GTX 900 Maxwell (Nouveau driver);
• support for runtime power management of the AHCI controllers;
• Dell and Alienware laptop support improvements;
• Linux 4.7 (more information: KernelNewbies | Phoronix):
• Microsoft Xbox One Elite Controller support;
• new "schedutil" governor for the CPUFreq scaling driver;
• Nouveau now has Nvidia GM108 Maxwell support;
• Linux 4.8 (more information: KernelNewbies | Phoronix):
• initial NVIDIA Pascal support for Nouveau;
• amdgpu OverDrive support, allowing overclicking AMD GPUs using the open source driver;
• Broadcom BCM2837 SoC support (this is used by the Raspberry Pi 3);
• Microsoft Surface 3 touch-screen support.

Download Ubuntu 16.10 (Yakkety Yak)

Important: all non-LTS Ubuntu versions are only supported for 9 months. Ubuntu 16.10 will be supported until July 2017.

Official release notes and download links for Ubuntu 16.10 desktop flavors:

• Kubuntu: release notes | download
• Ubuntu MATE: release notes | download
• Xubuntu: release notes | download
• Lubuntu: release notes | download
• Ubuntu GNOME
• Ubuntu Studio
• Ubuntu Kylin

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Ubuntu 15 04 Available For Download See What s New

Changes in Ubuntu 15.04 Desktop (Vivid Vervet)

Other Unity and Compiz changes include:

• Dash, HUD and the logout dialogs now work over fullscreen windows;
• tweaks to animations for faster startup and shutdown experiences;
• fixes for various problems that occur with the nVidia proprietary driver (mostly blank or black windows);
• many bug fixes and small improvements.

And finally, heres the new Ubuntu 15.04 default wallpaper:

Applications / packages

Document Viewer (Evince)

Videos (Totem)

GNOME System Monitor & Disks

Download Ubuntu 15.04 (Vivid Vervet)

Also see whats new in: Ubuntu MATE 15.04 and the other Ubuntu flavors.

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Trident What is the batch size for KafkaSpout

Today i encountered a problem in which i need to know what is the batch size for a TransactionalTridentKafkaSpout.

The default output field by KafkaSpout is "str", which can be of variable length. By some simple thought, it is reasonable that kafka spout will set the batch size dynamically based on the actual sizes of the "str" messages it retrieves in a batch. In other words, i suspect that the batch size may be determined by the following pseudo codes:

batchSize = 0;

totalBytesConsumed=0;

while(totalBytesConsumed < maxBytesConsumed)
{
    totalBytesConsumed+= getMessageSize("str");
    batchSize ++;

}

After quickly read through trident-kafkas source codes on TransactionalTridentKafkaSpout and trace down to the following classes and their methods:

TransactionalTridentKafkaSpout.getEmitter(...)
TridentKafkaEmitter.fetchMessages(...)
KafkaUtils.fetchMessages(...)

by the builder.addFetch(...) line in "KafkaUtils.fetchMessages(...)", it looks like the batch size is determine by a variable defined in KafkaConfig.fetchSizeBytes, which is defaulted to 1024 * 1024.

I also noticed another variable KafkaConfig.bufferSizeBytes, which is used by the SimpleConsumer class, this is also defaulted to 1024 * 1024.

Therefore i suspect that the batch size of the kafka spout depends on both Math.Min(KafkaConfig.bufferSizeBytes, kafkaConfig.fetchSizeBytes).

After some googling, I noticed for  handling huge data in Kafka, the following settings have been used:

kafkaConfig.bufferSizeBytes = 1024 * 1024 * 4;
kafkaConfig.fetchSizeBytes = 1024 * 1024 * 4;

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Two door Cinema Club What You Know

Enjoy !

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