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From Gus Heck <>
Subject Re: SolrCloud indexing triggers merges and timeouts
Date Wed, 05 Jun 2019 20:05:25 GMT
Probably not a solution, but so.ething I notice off the bat... generally
you want Xmx and Xms set to the same value so the jvm doesn't have to spend
time asking for more and more memory, and also reduce the chance that the
memory is not available by the time solr needs it.

On Wed, Jun 5, 2019, 11:39 AM Rahul Goswami <> wrote:

> Hello,
> I have a solrcloud setup on Windows server with below config:
> 3 nodes,
> 24 shards with replication factor 2
> Each node hosts 16 cores.
> Index size is 1.4 TB per node
> Xms 8 GB , Xmx 24 GB
> Directory factory used is SimpleFSDirectoryFactory
> The cloud is all nice and green for the most part. Only when we start
> indexing, within a few seconds, I start seeing Read timeouts and socket
> write errors and replica recoveries thereafter. We are indexing in 2
> parallel threads in batches of 50 docs per update request. After examining
> the thread dump, I see segment merges happening. My understanding is that
> this is the cause, and the timeouts and recoveries are the symptoms. Is my
> understanding correct? If yes, what steps could I take to help the
> situation. I do see that the difference between "Num Docs" and "Max Docs"
> is about 20%.
> Would appreciate your help.
> Thanks,
> Rahul

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