Solr 4.2 - what is _version_field?

solr solr4
meghana picture meghana · Mar 20, 2013 · Viewed 13.2k times · Source

I am getting below error in my solr configuration.

Caused by: org.apache.solr.common.SolrException: Unable to use updateLog: _version_field must exist in schema, using indexed="true" stored="true" and multiValued="false" (_version_ does not exist)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:806)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:619)
        at org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:1021)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:1051)
        ... 10 more
Caused by: org.apache.solr.common.SolrException: Unable to use updateLog: _version_field must exist in schema, using indexed="true" stored="true" and multiValued="false" (_version_ does not exist)
        at org.apache.solr.update.UpdateLog.init(UpdateLog.java:245)
        at org.apache.solr.update.UpdateHandler.initLog(UpdateHandler.java:84)
        at org.apache.solr.update.UpdateHandler.<init>(UpdateHandler.java:134)
        at org.apache.solr.update.DirectUpdateHandler2.<init>(DirectUpdateHandler2.java:95)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:526)
        at org.apache.solr.core.SolrCore.createUpdateHandler(SolrCore.java:597)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:790)
        ... 13 more
Caused by: org.apache.solr.common.SolrException: _version_field must exist in schema, using indexed="true" stored="true" and multiValued="false" (_version_ does not exist)
        at org.apache.solr.update.VersionInfo.getAndCheckVersionField(VersionInfo.java:57)
        at org.apache.solr.update.VersionInfo.<init>(VersionInfo.java:83)
        at org.apache.solr.update.UpdateLog.init(UpdateLog.java:242)
        ... 23 more

I wanted to know that what is _version_field, and why its must required ?

Can anybody suggest me on this??

Answer

ashish picture ashish · Jul 18, 2013

add the below field definition inside "field" tag in schema.xml

<field name="_version_" type="long" indexed="true" stored="true" multiValued="false"/>

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