Oh, I recall that we once tried to debug the same issue with
JanusGraph-Hbase, had clear supernodes in the graph. No attempts
on repartitioning, including analyzing code of SparkGraphComputer
and tinkering around thought to make it work for partitioned
vertices etc. were successful - apparently using Cassandra (latest
3.x version at the time) didn't lead to OOM, but was noticeably
slower than HBase when we used it with smaller graphs.
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