Re: Low cache hit ratio when running Spark on Alluxio

Depending on the Alluxio version you are running, e..g, for 2.0, the metrics of the local short-circuit read is not turned on by default. So I would suggest you to first turn on the metrics collecting local short-circuit reads by setting alluxio.user.metrics.collection.enabled=true Regarding the

Low cache hit ratio when running Spark on Alluxio

Hi, We are running Spark jobs on an Alluxio Cluster which is serving 13 gigabytes of data with 99% of the data is in memory. I was hoping to speed up the Spark jobs by reading the in-memory data in Alluxio, but found Alluxio local hit rate is only 1.68%, while Alluxio remote hit rate is 98.32%.