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https://issues.apache.org/jira/browse/SOLR-11107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kensho Hirasawa updated SOLR-11107:
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Attachment: SOLR-11107.patch
> make the threshold for zombie servers of LBHttpSolrClient configurable
> ----------------------------------------------------------------------
>
> Key: SOLR-11107
> URL: https://issues.apache.org/jira/browse/SOLR-11107
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: clients - java
> Reporter: Kensho Hirasawa
> Attachments: SOLR-11107.patch
>
>
> LBHttpSolrClient treats a server as a zombie if it receives abnormal response
> from the server. Servers in bad status are detected by this scheme.
> However, healthy servers can be treated as a zombie because even healthy
> servers sometimes returns server error. For example, if we submit a range
> query with bad syntax (like [a TO 1]), servers return 500 server error and
> the servers are treated as zombies. To make matters worse, in SolrCloud mode,
> all the servers in a cluster become zombies by retry if we do not set
> numServersToTry. Even if we set some small number to numServersToTry, several
> evil requests can rob the client of load balancing function.
> Servers should return 400 when they receive bad request but it may be
> difficult to fix all. Therefore, it is useful to enable relaxing the
> threshold for treating a server as a zombie. The implemented solution judges
> zombies by how many times in a row a server returns bad response not by
> whether a server returns bad response even once.
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