Solr 6.6.2 exceptions while rebuilding large indexes

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sitecore Caused by: org.apache.lucene.store.AlreadyClosedException: this IndexWriter is closed

sitecore o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: Exception writing document id

 

For last few weeks I was getting this exception while I was working on my local machine using a copy of production master and web databases. It never happened before, never with our dev databases synchronized by Unicorn.   Rebuild started normally, and then half an hour later I was getting an exception pointing into a random item saying that Sitecore is not able to write document ID.  Data corruption? But why is working on staging? No, the Java heap is running out of space.

By default heap size is  512 MBSolrDashboard

 

You can change it by uncommenting set  SOLR_JAVA_MEM  in solr.in.cmd file

SolrConfig

SolrDashboardAfter

 

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