SolrCloud on HDFS, Zookeeper does not update clusterstate.json for multiple shards -

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i facing particular issue. when start solrcloud on hdfs solr.xml having single core collection, zookeeper updates clusterstate.json file.

however, if same solr.xml has 2 cores(shards) same collection, zookeeper throws null pointer exception overseer queue. root cause seems clusterstate.json not updated reflect new shard.

why zookeeper throw error when adding new core collection ?


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