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From "S.L" <>
Subject Heavy Multi-threaded indexing and SolrCloud 4.10.1 replicas out of synch.
Date Mon, 27 Oct 2014 01:59:15 GMT

I have posted previously about this , I am using SolrCloud 4.10.1 and have
a sharded collection with  6 nodes , 3 shards and a replication factor of 2.

I am indexing Solr using a Hadoop job , I have 15 Map fetch tasks , that
can each have upto 5 threds each , so the load on the indexing side can get
to as high as 75 concurrent threads.

I am facing an issue where the replicas of a particular shard(s) are
consistently getting out of synch , initially I thought this was beccause I
was using a custom component , but I did a fresh install and removed the
custom component and reindexed using the Hadoop job , I still see the same

I do not see any exceptions in my catalina.out , like OOM , or any other
excepitions, I suspecting thi scould be because of the multi-threaded
indexing nature of the Hadoop job . I use CloudSolrServer from my java code
to index and initialize the CloudSolrServer using a 3 node ZK ensemble.

Does any one know of any known issues with a highly multi-threaded indexing
and SolrCloud ?

Can someone help ? This issue has been slowing things down on my end for a
while now.

Thanks and much appreciated!

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