GitHub user cestella opened a pull request:
https://github.com/apache/metron/pull/879
METRON-1378: Create a summarizer
## Contributor Comments
We have a nice and generalized infrastructure for loading data into HBase
and interacting with it via `flatfile_loader.sh` and `ENRICHMENT_GET()`. It is
also useful to summarize a set of data into a static data structure, store it
on HDFS and interact with it via stellar. To this end, to complement the
`flatfile_loader.sh`, we should have a `flatfile_summarizer.sh` that, using the
same extractor config, will process a flat file and output a serialized object.
The usecase for this is as follows:
Let's say that I have a static list of domains in the second column of a
CSV, domains.csv, and I want to generate a bloom filter with those domains in
them sans TLD.
I should be able to create a file called `bloom.ser` with the serialized
bloom filter given the extractor config:
```
{
"config" : {
"columns" : {
"rank" : 0,
"domain" : 1
},
"value_transform" : {
"domain" : "DOMAIN_REMOVE_TLD(domain)"
},
"value_filter" : "LENGTH(domain) > 0",
"state_init" : "BLOOM_INIT()",
"state_update" : {
"state" : "BLOOM_ADD(state, domain)"
},
"state_merge" : "BLOOM_MERGE(states)",
"separator" : ","
},
"extractor" : "CSV"
}
```
Note, the associated stellar function `OBJECT_GET` is pending.
# Testing Plan
We should run the test plan for #445 to ensure no regressions since 80% of
this PR is just refactoring existing abstractions to reuse.
## Write out a String Locally
We are going to take the top 10k alexa domains (saved as part of #445 's
test plan to `~/top-10k.csv`)
* Keep a running sample of 20 samples per thread
* At the end, merge the samples and get a random domain from the merged
samples
* Write out the sample
### Test
* Create a file `~/extractor_sample.json` with the following contents:
```
{
"config" : {
"columns" : {
"rank" : 0,
"domain" : 1
},
"value_transform" : {
"domain" : "DOMAIN_REMOVE_TLD(domain)"
},
"value_filter" : "LENGTH(domain) > 0",
"state_init" : "SAMPLE_INIT(20)",
"state_update" : {
"state" : "SAMPLE_ADD(state, domain)"
},
"state_merge" : "GET_FIRST(SAMPLE_GET(SAMPLE_MERGE(states,
SAMPLE_INIT(1))))",
"separator" : ","
},
"extractor" : "CSV"
}
```
* Summarize via `$METRON_HOME//bin/flatfile_summarizer.sh -i ~/top-10k.csv
-o ~/sample.ser -e ./extractor_sample.json -p 5 -b 128`
* Execute `hexdump -C ./sample.ser` and ensure that there is a string in
there. It may end or start with some non-ascii bytes at the beginning and end.
e.g.
```
[root@node1 ~]# hexdump -C ./sample.ser
00000000 03 01 37 63 66 6d 6e e6 |..7cfmn.|
00000008
[root@node1 ~]# cat top-10k.csv | grep 7cfmn
4696,7cfmnf.top
```
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cestella/incubator-metron flatfile_object_gen
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/metron/pull/879.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #879
----
commit 9c492c4540534fa72550aff330ce6c588f640965
Author: cstella <cestella@...>
Date: 2017-12-21T15:17:18Z
flatfile summarizer initial commit.
commit 15681143e86913a692777770d0a89e1c877e3d99
Author: cstella <cestella@...>
Date: 2017-12-21T18:50:58Z
typo
commit 935d4d2933e7156219722e54cec5dfce228fdbcc
Author: cstella <cestella@...>
Date: 2017-12-21T21:17:23Z
Updating tests and docs.
commit afe91c341608468e2637db4a02f9428ebe19353a
Author: cstella <cestella@...>
Date: 2017-12-21T21:18:20Z
more docs.
----
---
