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README.md
In sparkwarc: Load WARC Files into Apache Spark

sparkwarc - WARC files in sparklyr

Install

Install using with:

devtools::install_github("javierluraschi/sparkwarc")

Intro

The following example loads a very small subset of a WARC file from Common Crawl, a nonprofit 501 organization that crawls the web and freely provides its archives and datasets to the public.

library(sparkwarc)
library(sparklyr)
library(DBI)
library(dplyr)

sc <- spark_connect(master = "local")

## * Using Spark: 2.1.0

spark_read_warc(
  sc,
  "warc",
  system.file("samples/sample.warc.gz", package = "sparkwarc"),
  repartition = 8)

SELECT count(value)
FROM WARC
WHERE length(regexp_extract(value, '<html', 0)) > 0

| count(value) | |:-------------| | 6 |

cc_regex <- function(ops) {
  ops %>%
    filter(regval != "") %>%
    group_by(regval) %>%
    summarize(count = n()) %>%
    arrange(desc(count)) %>%
    head(100)
}

cc_stats <- function(regex) {
  tbl(sc, "warc") %>%
    transmute(regval = regexp_extract(value, regex, 1)) %>%
    cc_regex()
}

cc_stats("http-equiv=\"Content-Language\" content=\"(.*)\"")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##   regval count
##    <chr> <dbl>
## 1  ru-RU     5

cc_stats("<script .*src=\".*/(.+)\".*")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##                            regval count
##                             <chr> <dbl>
## 1                           08.js     5
## 2                           ga.js     5
## 3 jquery.formtips.1.2.2.packed.js     5
## 4   jquery-ui-1.7.2.custom.min.js     5
## 5             jquery-1.4.2.min.js     5
## 6                        start.js     5
## 7           jquery.equalHeight.js     5
## 8                      lytebox.js     5
## 9                      plusone.js     5

cc_stats("<([a-zA-Z]+)>")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##      regval count
##       <chr> <dbl>
##  1       li    53
##  2     span    26
##  3       th    18
##  4        p    17
##  5       ul    16
##  6       tr    13
##  7   strong     7
##  8    title     6
##  9     body     6
## 10     head     6
## 11      div     6
## 12 noscript     5
## 13    table     3
## 14       td     3
## 15       br     1
## 16    style     1

cc_stats(" ([a-zA-Z]{5,10}) ")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##      regval count
##       <chr> <dbl>
##  1  counter    10
##  2   PUBLIC     6
##  3   return     6
##  4  Banners     5
##  5   widget     5
##  6 function     5
##  7   Banner     5
##  8    solid     2
##  9    Nutch     1
## 10   Domain     1
## 11    visit     1
## 12    crawl     1
## 13 Registry     1
## 14   Parked     1
## 15   Format     1
## 16 priceUAH     1
## 17   domain     1

cc_stats("<meta .*keywords.*content=\"([^,\"]+).*")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##                               regval count
##                                <chr> <dbl>
## 1                                Лес     1
## 2                           Вип Степ     1
## 3                       domain names     1
## 4 Регистрация-ликвидация предприятий     1
## 5                            Свобода     1
## 6                               Foxy     1

cc_stats("<script .*src=\".*/([^/]+.js)\".*")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##                            regval count
##                             <chr> <dbl>
## 1 jquery.formtips.1.2.2.packed.js     5
## 2                           08.js     5
## 3                           ga.js     5
## 4           jquery.equalHeight.js     5
## 5                      lytebox.js     5
## 6                      plusone.js     5
## 7   jquery-ui-1.7.2.custom.min.js     5
## 8             jquery-1.4.2.min.js     5
## 9                        start.js     5

spark_disconnect(sc)

Querying 1GB

warc_big <- normalizePath("~/cc.warc.gz")           # Name a 5GB warc file
if (!file.exists(warc_big))                         # If the file does not exist
  download.file(                                    # download by
    gsub("s3n://commoncrawl/",                      # mapping the S3 bucket url
         "https://commoncrawl.s3.amazonaws.com/",   # into a adownloadable url
         sparkwarc::cc_warc(1)), warc_big)          # from the first archive file

config <- spark_config()
config[["spark.memory.fraction"]] <- "0.9"
config[["spark.executor.memory"]] <- "10G"
config[["sparklyr.shell.driver-memory"]] <- "10G"

sc <- spark_connect(master = "local", config = config)

## * Using Spark: 2.1.0

spark_read_warc(
  sc,
  "warc",
  warc_big,
  repartition = 8)

df <- data.frame(list(a = list("a,b,c")))

SELECT count(value)
FROM WARC
WHERE length(regexp_extract(value, '<([a-z]+)>', 0)) > 0

| count(value) | |:-------------| | 6336761 |

SELECT count(value)
FROM WARC
WHERE length(regexp_extract(value, '<html', 0)) > 0

| count(value) | |:-------------| | 74519 |

cc_stats("http-equiv=\"Content-Language\" content=\"([^\"]*)\"")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##    regval count
##     <chr> <dbl>
##  1     en   533
##  2  en-us   323
##  3     ru   150
##  4     es   127
##  5  en-US   105
##  6     fr    95
##  7     de    92
##  8     pl    71
##  9     cs    48
## 10     ja    45
## # ... with 90 more rows

cc_stats("WARC-Target-URI: http://([^/]+)/.*")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##                        regval count
##                         <chr> <dbl>
##  1    www.urbandictionary.com   156
##  2                 my-shop.ru    69
##  3 hfboards.hockeysfuture.com    69
##  4      www.greatlakes4x4.com    66
##  5        www.opensecrets.org    60
##  6         www.summitpost.org    57
##  7             brainly.com.br    57
##  8         www.mobileread.com    54
##  9          www.genealogy.com    54
## 10               shop.ccs.com    51
## # ... with 90 more rows

cc_stats("<([a-zA-Z]+)>")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##    regval   count
##     <chr>   <dbl>
##  1     li 2492324
##  2   span  506471
##  3     tr  440658
##  4      p  432221
##  5     td  398106
##  6     ul  258962
##  7    div  211937
##  8 script  198504
##  9     br  196993
## 10 strong  152675
## # ... with 90 more rows

cc_stats("<meta .*keywords.*content=\"([a-zA-Z0-9]+).*")

## # Source:     lazy query [?? x 2]
## # Database:   spark_connection
## # Ordered by: desc(count)
##    regval count
##     <chr> <dbl>
##  1  width   285
##  2   http   235
##  3   free   110
##  4   text   110
##  5    The   100
##  6  index    91
##  7  https    85
##  8  SKYPE    59
##  9      1    55
## 10   news    48
## # ... with 90 more rows

spark_disconnect(sc)

Querying 1TB

By running sparklyr in EMR, one can configure an EMR cluster and load about ~5GB of data using:

sc <- spark_connect(master = "yarn-client")
spark_read_warc(sc, "warc", cc_warc(1, 1))

tbl(sc, "warc") %>% summarize(n = n())
spark_disconnect_all()

To read the first 200 files, or about ~1TB of data, first scale the cluster, consider maximizing resource allocation with the followin EMR config:

[
  {
    "Classification": "spark",
    "Properties": {
      "maximizeResourceAllocation": "true"
    }
  }
]

Followed by loading the [1, 200] file range with:

sc <- spark_connect(master = "yarn-client")
spark_read_warc(sc, "warc", cc_warc(1, 200))

tbl(sc, "warc") %>% summarize(n = n())
spark_disconnect_all()

To query ~1PB for the entire crawl, a custom script would be needed to load all the WARC files.