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From Jeff Kubina <>
Subject Re: New Accumulo Blog Post
Date Thu, 03 Nov 2016 01:01:57 GMT
Thanks for the blog post, very interesting read. Some questions ...

1. Are the operations "Writes mutation to tablet servers’ WAL/Sync or flush
tablet servers’ WAL" and "Adds mutations to sorted in memory map of each
tablet." performed by threads in parallel?

2. Could the latency of hsync-ing the WALs be overcome by modifying
Accumulo to write them to a separate SSD-only HDFS? To maintain data
locality it would require two datanode processes (one for the HDDs and one
for the SSD), running on the same node, which is not hard to do.

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