duplicate series with the same tag set

[zarnovican]

Bug report

System info: InfluxDB 0.13.0, Ubuntu Trusty 64-bit

Steps to reproduce:

# create db
curl -POST http://localhost:8086/query --data-urlencode "q=CREATE DATABASE mydb"
# insert two datapoints for the same series, but different tag order
curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,a=1,b=2,c=3 value=42'
curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,b=2,a=1,c=3 value=42'

Expected behavior: I would expect only one series to be created.

> show series
key
m,a=1,b=2,c=3

Actual behavior: There are two series, with the same tag set.

> show series
key
m,a=1,b=2,c=3
m,b=2,a=1,c=3

Additional info:

If you would test it with two tags..

curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,a=1,b=2 value=42'
curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,b=2,a=1 value=42'

..it would work as expected.

What's worse, if you write datapoint for the same time, it will create "duplicate" datapoint.

curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,a=1,b=2,c=3 value=10 1434055566000000000'
curl -XPOST 'http://localhost:8086/write?db=mydb' --data-binary 'm,b=2,a=1,c=3 value=20 1434055566000000000'

> select * from m
name: m
-------
time            a   b   c   value
1434055566000000000 1   2   3   10
1434055566000000000 1   2   3   20

[nordewal]

I can confirm this bug on InfluxDB 0.13.0, RHEL 7.2 64-bit