公开(公告)号：US09722631B2

公开(公告)日：2017-08-01

申请号：US15397098

申请日：2017-01-03

Applicant: Huawei Technologies Co., Ltd.

Inventor： Jiansheng Wei ,  Junhua Zhu

IPC: H03M7/40 ,  H03M7/30

CPC classification number: H03M7/40 ,  H03M7/3068 ,  H03M7/4037 ,  H03M7/6058 ,  H03M7/6082

Abstract: A method and an apparatus for calculating an estimated data compression ratio relate to the field of data processing technologies. In the solutions, an estimated data compression ratio is calculated using a related indicator that represents a distribution pattern of symbols in a symbol sequence, where the related indicator that represents the distribution pattern of the symbols in the symbol sequence is relatively closely related to the estimated data compression ratio.

公开(公告)号：US09678969B2

公开(公告)日：2017-06-13

申请号：US15241909

申请日：2016-08-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Liqun Deng ,  Junhua Zhu

IPC: G06F17/00 ,  G06F17/30 ,  G06F3/06

CPC classification number: G06F17/3012 ,  G06F3/061 ,  G06F3/0638 ,  G06F3/067 ,  G06F17/30091 ,  G06F17/30185 ,  G06F17/30194 ,  G06F17/30238

Abstract: A metadata updating method based on columnar storage in a distributed file system includes acquiring to-be-updated metadata in a data table, splitting data records of the data table into multiple row groups on a row basis, converting the data table into global file metadata and multiple row group files, where the row group file includes an actual data block, a data index block, a local metadata block, a metadata index block, and a file footer, determining whether the to-be-updated metadata belongs to the global file metadata, updating local metadata when the to-be-updated metadata does not belong to the global file metadata, and adding an updated local metadata block, an updated metadata index block, and an updated file footer to the multiple row group files according to updated local metadata. Dynamic updating of metadata saves time of executing an updating operation of this type and needed computing resources.

公开(公告)号：US20170117918A1

公开(公告)日：2017-04-27

申请号：US15397098

申请日：2017-01-03

Applicant: Huawei Technologies Co., Ltd.

Inventor： Jiansheng Wei ,  Junhua Zhu

IPC: H03M7/40 ,  H03M7/30

CPC classification number: H03M7/40 ,  H03M7/3068 ,  H03M7/4037 ,  H03M7/6058 ,  H03M7/6082

Abstract: A method and an apparatus for calculating an estimated data compression ratio relate to the field of data processing technologies. In the solutions, an estimated data compression ratio is calculated using a related indicator that represents a distribution pattern of symbols in a symbol sequence, where the related indicator that represents the distribution pattern of the symbols in the symbol sequence is relatively closely related to the estimated data compression ratio.