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From Joe Obernberger <>
Subject Solr on HDFS
Date Thu, 01 Aug 2019 21:40:42 GMT
Been using Solr on HDFS for a while now, and I'm seeing an issue with 
redundancy/reliability.  If a server goes down, when it comes back up, 
it will never recover because of the lock files in HDFS. That solr node 
needs to be brought down manually, the lock files deleted, and then 
brought back up.  At that point, it appears to copy all the data for its 
replicas.  If the index is large, and new data is being indexed, in some 
cases it will never recover. The replication retries over and over.

How can we make a reliable Solr Cloud cluster when using HDFS that can 
handle servers coming and going?

Thank you!


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