Github user nickwallen commented on the issue:
https://github.com/apache/incubator-metron/pull/397
I was thinking how I could use your HLLP functionality with the Profiler.
I think I could use this functionality to track the in-degree and out-degree of
a host over time. This might be an interesting motivating example.
For example, calculating the in-degree would look like the following.
```
{
"profile": "in-degree",
"onlyif": "source.type == 'yaf'"
"foreach": "ip_dst_addr",
"init": {
"in": "HLLP_INIT(5, 6)"
}
"update": {
"in": "HLLP_ADD(in, ip_src_addr)"
}
"result": {
"HLLP_CARDINALITY(in)"
}
}
```
Calculating the out-degree would look like this.
```
{
"profile": "out-degree",
"onlyif": "source.type == 'yaf'"
"foreach": "ip_src_addr",
"init": {
"out": "HLLP_INIT(5, 6)"
}
"update": {
"out": "HLLP_ADD(out, ip_dst_addr)"
}
"result": {
"HLLP_CARDINALITY(out)"
}
}
```
Of course, with your `HLLP_MERGE` it might be more interesting to store the
HLLP object itself and call `HLLP_CARDINALITY` after-the-fact, but I just want
to make sure I'm using the API correctly.
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