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From Daegyu Han <hdg9...@gmail.com>
Subject Does Hedged-read usually happen in real workloads?
Date Mon, 19 Aug 2019 12:29:56 GMT
Hi all,

To my understand, Hedged-Read is a technique for copying IO to a replica
when pread () is delayed to mitigate IO latency such as speculative
execution in MapReduce.

- Does Hedged-read really happen where it uses hbase databases?
- Does hedged-read often occur because of a bottleneck in HDFS or a
bottleneck in the storage itself?
- What is the best number to set the timeout and thread for Hedged-Read?

Thank you

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