Most Hadoop and HBase roles at least have a configuration servlet that you can visit over at their Web Port's /conf page, for ex. http://NNHOST:50070/conf, which would show you their loaded configuration.
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NameNode by default would wait upto 10.5 minutes before declaring a non-heartbeating DataNode as dead and processing its block list as under-replicated. P.s. Its better to open a new topic per question, it helps others searching for specific Q&A.
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