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From Walter Underwood <>
Subject Re: Scaling issue with Solr
Date Wed, 27 Dec 2017 22:10:19 GMT
Why are you using Solr for log search? Elasticsearch is widely used for log search and has
the best infrastructure for that.

For the past few years, it looks like a natural market segmentation is happening, with Solr
used for product search and ES for log search. By now, I would not expect Solr to keep up
with ES in log search features. Likewise, I would not expect ES to keep up with Solr for product
and text search features.

Walter Underwood  (my blog)

> On Dec 27, 2017, at 1:33 PM, Erick Erickson <> wrote:
> You are probably hitting more and more background merging which will
> slow things down. Your system looks to be severely undersized for this
> scale.
> One thing you can try (and I emphasize I haven't prototyped this) is
> to increase your RamBufferSizeMB solrcofnig.xml setting significantly.
> By default, Solr won't merge segments to greater than 5G, so
> theoretically you could just set your ramBufferSizeMB to that figure
> and avoid merging all together. Or you could try configuring the
> NoMergePolicy in solrconfig.xml (but beware that you're going to
> create a lot of segments unless you set the rambuffersize higher).
> How this will affect your indexing throughput I frankly have no data.
> You can see that with numbers like this, though, a 4G heap is much too
> small.
> Best,
> Erick
> On Wed, Dec 27, 2017 at 2:18 AM, Prasad Tendulkar
> <> wrote:
>> Hello All,
>> We have been building a Solr based solution to hold a large amount of data (approx
4 TB/day or > 24 Billion documents per day). We are developing a prototype on a small scale
just to evaluate Solr performance gradually. Here is our setup configuration.
>> Solr cloud:
>> node1: 16 GB RAM, 8 Core CPU, 1TB disk
>> node2: 16 GB RAM, 8 Core CPU, 1TB disk
>> Zookeeper is also installed on above 2 machines in cluster mode.
>> Solr commit intervals: Soft commit 3 minutes, Hard commit 15 seconds
>> Schema: Basic configuration. 5 fields indexed (out of one is text_general), 6 fields
>> Collection: 12 shards (6 per node)
>> Heap memory: 4 GB per node
>> Disk cache: 12 GB per node
>> Document is a syslog message.
>> Documents are being ingested into Solr from different nodes. 12 SolrJ clients ingest
data into the Solr cloud.
>> We are experiencing issues when we keep the setup running for long time and after
processing around 100 GB of index size (I.e. Around 600 Million documents). Note that we are
only indexing the data and not querying it. So there should not be any query overhead. From
the VM analysis we figured out that over time the disk operations starts declining and so
does the CPU, RAM and Network usage of the Solr nodes. We concluded that Solr is unable to
handle one big collection due to index read/write overhead and most of the time it ends up
doing only the commit (evident in Solr logs). And because of that indexing is getting hampered
>> So we thought of creating small sized collections instead of one big collection anticipating
the commit performance might improve. But eventually the performance degrades even with that
and we observe more or less similar charts for CPU, memory, disk and network.
>> To put forth some stats here are the number of documents processed every hour
>> 1St hour: 250 million
>> 2nd hour: 250 million
>> 3rd hour: 240 million
>> 4th hour: 200 million
>> .
>> .
>> 11th hour: 80 million
>> Could you please help us identifying the root cause of degradation in the performance?
Are we doing something wrong with the Solr configuration or the collections/sharding etc?
Due to this performance degradation we are currently stuck with Solr.
>> Thank you very much in advance.
>> Prasad Tendulkar

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