I was trying to create ~150-million metrics (pushing host to metric, lots
of hosts and metrics).

I started getting heap exceptions in OpenTSDB.  I'm only using it to create
metrics via the API currently, I'm not throwing any data at it.

I started getting OOM / Out Of Memory errors in OpenTSDB.  Does the
OpenTSDB implementation require keeping all UIDs in memory at the same time
which would cause me to run out of heap? I would have assumed it was an LRU
cache or something like that.
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