Comment 1 for bug 1445227

hbase use (meter, timestamp, signature) as the unique key, now we enable set signature to '', meanwhile our test case use same timestamp for some samples, then test fails

I think hbase needs to choose another way to identify different samples, for example, use message id (which definitely exists)

mock the ceilometer.conf can avoid this, but may be prepare a specific env can be OK too
always use default value may lead to some ignored case such as this one