Abstract: A pipetting device includes a portal frame. The portal frame is arranged with a bearing device for bearing a feed pump, a driving mechanism for driving the bearing device to move up and down, and a liquid suction and injection mechanism for sucking or injecting liquid by the feed pump. The bearing device includes a bearing plate with receiving grooves. The driving mechanism includes a first bracing plate connected to the bearing plate, and the frame is arranged with a first motor. The liquid suction and injection mechanism includes a second bracing plate. The first bracing plate is arranged with a second motor. The first motor and the second motor are connected to a PLC.

Abstract: A method for failover in an HBase system, applied to a first worker node in the HBase system, includes: a write-ahead logging (WAL) file sent by a management node in the HBase system is acquired, the WAL file including WAL files of multiple table fragments in a second worker node in the HBase system when the second worker node fails; the WAL file is split in the memory of the present node to obtain the WAL files of the multiple table fragments; updated data of the multiple table fragments in a memory of the second worker node when the second worker node fails is determined according to the WAL files of the multiple table fragments in the memory of the first worker node; and the updated data of the multiple table fragments is written into a hard disk of the first worker node.

Abstract: A method for failover in an HBase system, applied to a first worker node in the HBase system, includes: a write-ahead logging (WAL) file sent by a management node in the HBase system is acquired, the WAL file including WAL files of multiple table fragments in a second worker node in the HBase system when the second worker node fails; the WAL file is split in the memory of the present node to obtain the WAL files of the multiple table fragments; updated data of the multiple table fragments in a memory of the second worker node when the second worker node fails is determined according to the WAL files of the multiple table fragments in the memory of the first worker node; and the updated data of the multiple table fragments is written into a hard disk of the first worker node.