Solr报错Index locked for write for core '***'. Solr now longer supports forceful unlocking via

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      unlockOnStartup 告知 Solr 忽略在多线程环境中用来保护索引的锁定机制。在某些情况下,索引可能会由于不正确的关机或其他错误而一直处于锁定,这就妨碍了添加和更新。将其设置为 true 可以禁用启动锁定,进而允许进行添加和更新。

      进入solr-5.3.1/server/solr/被锁住的集合名/conf, 修改solrconfig.xml文件, 在<lockType>${solr.lock.type:native}</lockType>语句上面加一条语句:<unlockOnStartup>true</unlockOnStartup>

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