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https://issues.apache.org/jira/browse/SOLR-12382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16483184#comment-16483184
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Shawn Heisey commented on SOLR-12382:
-------------------------------------
We do have documentation that says NRT replica types are the only kind that
support soft commits.
https://lucene.apache.org/solr/guide/7_3/shards-and-indexing-data-in-solrcloud.html#all-nrt-replicas
If your code is doing a soft commit, then this is what's happening:
* Changes are indexed.
* A soft commit is called.
* The leader does the commit, but only into memory. That change is NOT
replicated to the other replicas.
* Your first query is made. It gets load balanced by the cluster to a replica
other than the leader.
* Within 15 seconds (your autoCommit interval), a hard commit is fired,
flushing all segments to disk. At this point, the changes to the index will be
on disk, so they are replicated.
* A query here will see the change, no matter which replica it is sent to.
The solution to that is to use hard commits or NRT replicas.
> new data not seen immediately after commit() on SolrCloud collection with
> only TLOG and PULL replicas
> -----------------------------------------------------------------------------------------------------
>
> Key: SOLR-12382
> URL: https://issues.apache.org/jira/browse/SOLR-12382
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.3
> Environment: SolrCloud on Amazon Linux AMI 2018.03
>
> Reporter: Nguyen Nguyen
> Priority: Major
>
> On collection with TLOG/PULL replicas, queries that follow right after
> commit(waitSearch:true) would NOT return newly added data until several
> seconds later.
> Tested same scenario on another collection with only NRT replicas and found
> that it behaved as expected (query returned newly added data right after
> commit(waitSearch:true) was called.
> 7.3 SolrCloud with 3 shards, each shard has 2 TLOG replicas + 1 PULL replica
> Commit settings
> <autoCommit>
> <maxTime>15000</maxTime>
> <openSearcher>false</openSearcher>
> </autoCommit>
> <autoSoftCommit>
> <maxTime>-1</maxTime>
> </autoSoftCommit>
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