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https://issues.apache.org/jira/browse/SOLR-9925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063663#comment-16063663
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Brandon Chapman edited comment on SOLR-9925 at 6/26/17 8:04 PM:
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We have seen this same issue on Solr 6.4.2. If you send deleteByQuery,
{noformat}"_root_ :THE_ROOT"{noformat} with an add for the same document in the
same request, you can trigger this easily.
In our case we had to use a deleteByQuery due to deleteById not working
correctly on sharded collections. Our only solution is to go back to a
non-sharded collection so we can use deleteById.
was (Author: bchapman):
We have seen this same issue on Solr 6.4.2. If you send deleteByQuery
{noformat}"_root_ :THE_ROOT"{noformat}, with an add for the same document in
the same request, you can trigger this easily.
In our case we had to use a deleteByQuery due to deleteById not working
correctly on sharded collections. Our only solution is to go back to a
non-sharded collection so we can use deleteById.
> Child documents missing from replicas during parallel delete+add
> ----------------------------------------------------------------
>
> Key: SOLR-9925
> URL: https://issues.apache.org/jira/browse/SOLR-9925
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.5.2, 6.3
> Environment: Java 1.8 (OpenJDK) on both CentOS 6.7 and Ubuntu 16.04.1
> Reporter: Dan Sirotzke
> Attachments: generate.py, run.sh
>
>
> When pushing documents to Solr in parallel, doing a delete-by-query and then
> add for the same set of IDs within each thread results in some of the
> replicas missing some of the child documents. All the parent documents are
> successfully replicated.
> This appears to trigger some sort of race condition, since:
> * Documents are never missing from the leader.
> * Documents _might_ be missing from the replicas.
> * When they are missing, the number and which documents are different for
> each replica and each run.
> * It happens more easily with large documents; my test script needs a huge
> number of documents to trigger it a small number of times, whereas it happens
> ~5% of the time on our dataset.
> * We're currently on Solr 5.5.2, but I've also managed to trigger it on 6.3.0
> * When not running anything in parallel, this doesn't occur.
> Quick aside, since this is surely the first thing that will jump out: We
> can't just do an update due to to the uniqueKey/\_root\_ issue behind
> SOLR-5211.
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