deduplication

Deduplicate string instances

由 只愿长相守 提交于 2021-01-28 22:08:28
问题 I have array of nearly 1,000,000 records, each record has a field "filename". There are many records with exactly the same filename. My goal is to improve memory footprint by deduplicating string instances (filename instances, not records). .NET Framework 2.0 is a constraint. no LINQ here. I wrote a generic (and thread-safe) class for the deduplication: public class Deduplication<T> where T : class { private static Deduplication<T> _global = new Deduplication<T>(); public static Deduplication

GDB: Lessfs; How to Trace

由 China☆狼群 提交于 2020-01-15 20:11:45
问题 I am trying to trace this open source program called lessfs: and inline data deduplication filesystem for linux, but I am having trouble stepping through step by step using GDB Lessfs can be found here: http://www.lessfs.com/wordpress/ Are there any other tools recommended for tracing large open source programs as such? The source code is about 3,000 lines with multiple files, and I understand which part of the files I would be working on, but it would be great if there were a program that

Explicit sort parallelization via xargs — Incomplete results from xargs --max-procs

由 一笑奈何 提交于 2019-12-13 19:41:52
问题 Context I need to optimize deduplication using 'sort -u' and my linux machine has an old implementation of 'sort' command (i.e. 5.97) that has not '--parallel' option. Although 'sort' implements parallelizable algorithms (e.g. merge-sort), I need to make such parallelization explicit. Therefore, I make it by hand via 'xargs' command that outperforms ~2.5X w.r.t. to the single 'sort -u' method ... when it works fine. Here the intuition of what I am doing. I am running a bash script that splits

Deciding key value pair for deduplication using hadoop mapreduce

由 此生再无相见时 提交于 2019-12-13 12:34:01
问题 I want to implement deduplication of files using Hadoop Mapreduce. I plan to do it by calculating MD5 sum of all the files present in the input directory in my mapper function. These MD5 hash would be the key to the reducer, so files with the same hash would go to the same reducer. The default for the mapper in Hadoop is that the key is the line number and the value is the content of the file. Also I read that if the file is big, then it is split into chunks of 64 MB, which is the maximum

SQL: how to select the row with most known values?

由 你。 提交于 2019-12-11 08:24:41
问题 I have the table of users (username, gender, date_of_birth, zip) where the user's id is permanent but the user could be registered many times in the past where sometimes he filled out all the data and sometimes not. Besides that, he could change the residency (in this case zip can change). So the query SELECT username, sex, date_birth, zip FROM users_log WHERE username IN('user1', 'user2', 'user3') returns the following result: "user1";"M";"1982-10-04 00:00:00";"6320" "user2";"";"";"1537"

Deduping Column pairs in R

由 女生的网名这么多〃 提交于 2019-12-11 01:58:44
问题 I have a dataframe containing 7 columns and would like to records that have same info in the first two columns even they are in reverse order. Here is a snippet of my df zip1 zip2 APP PCR SCR APJ PJR 1 01701 01701 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 2 01701 01702 0.9887567 0.9898379 0.9811615 0.9993856 0.9842659 3 01701 01703 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 4 01701 01704 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 5 01704 01701 1.0000000 1.0000000 1

What's the best way to remove duplicates from a string in PHP (or any language)?

由 好久不见. 提交于 2019-12-08 12:25:35
问题 I am looking for the best known algorithm for removing duplicates from a string. I can think of numerous ways of doing this, but I am looking for a solution that is known for being particularly efficient. Let's say you have the following strings: Lorem Ipsum Lorem Ipsum Lorem Lorem Lorem Lorem Ipsum Dolor Lorem Ipsum Dolor Lorem Ipsum Dolor I would expect this algorithm to output for each (respectively): Lorem Ipsum Lorem Lorem Ipsum Dolor Note, I am doing this in PHP, in case anybody is

How do I check for duplicate data on ElasticSearch?

由 ￡可爱￡侵袭症＋ 提交于 2019-12-07 04:37:45
问题 When storing some documents, it should store the nonexistent and ignore the rest (should this be done at application level, maybe checking if document's id already exists, etc.?) 回答1: Here is what is stated in documentation: Operation Type The index operation also accepts an op_type that can be used to force a create operation, allowing for “put-if-absent” behavior. When create is used, the index operation will fail if a document by that id already exists in the index. Here is an example of

Can we write a generic array/slice deduplication in go?

由 烈酒焚心 提交于 2019-12-04 10:06:33
问题 Is there a way to write a generic array/slice deduplication in go, for []int we can have something like (from http://rosettacode.org/wiki/Remove_duplicate_elements#Go ): func uniq(list []int) []int { unique_set := make(map[int] bool, len(list)) for _, x := range list { unique_set[x] = true } result := make([]int, len(unique_set)) i := 0 for x := range unique_set { result[i] = x i++ } return result } But is there a way to extend it to support any array? with a signature like: func deduplicate

Remove duplicate documents from a search in Elasticsearch

由 ∥☆過路亽．° 提交于 2019-11-26 20:24:47
I have an index with a lot of paper with the same value for the same field. I have one deduplication on this field. Aggregators will come to me as counters. I would like a list of documents. My index : Doc 1 {domain: 'domain1.fr', name: 'name1', date: '01-01-2014'} Doc 2 {domain: 'domain1.fr', name: 'name1', date: '01-02-2014'} Doc 3 {domain: 'domain2.fr', name: 'name2', date: '01-03-2014'} Doc 4 {domain: 'domain2.fr', name: 'name2', date: '01-04-2014'} Doc 5 {domain: 'domain3.fr', name: 'name3', date: '01-05-2014'} Doc 6 {domain: 'domain3.fr', name: 'name3', date: '01-06-2014'} I want this
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