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Run-2 of the Large Hadron Collider (LHC) will provide new challenges to trackand vertex reconstruction with higher energies, denser jets and higher rates.Therefore the ATLAS experiment has constructed the first 4-layer Pixel Detectorin HEP, installing a new pixel layer, also called Insertable B-Layer (IBL). TheIBL is a fourth layer of pixel detectors, and has been installed in May 2014 ata radius of 3.3 cm between the existing Pixel Detector and a new smaller radiusbeam-pipe. The new detector, built to cope with the high radiation and expectedoccupancy, is the first large scale application of 3D sensors and CMOS 130~nmreadout electronics. In addition, the Pixel Detector was improved with a newservice quarter panel to recover about 3\% of defective modules lost duringRun-1 and a new optical readout system to readout the data at higher speedwhile reducing the occupancy when running with increased luminosity.  Complementing detector improvements, many improvements to Inner Detectortrack and vertex reconstruction were developed during the two-year shutdown ofthe LHC. These include novel techniques developed to improve the performance inthe dense cores of jets, optimisation for the expected conditions, and asoftware campaign which lead to a factor of three decrease in the CPU timeneeded to process each recorded event.

The upgraded Pixel detector and the commissioning of the Inner Detector tracking of the ATLAS experiment for Run-2 at the Large Hadron Collider