Re: Is there a clean way to determine whether a core exists?
Wow -- thanks for all the help!! With everyone's help, I did end up
in a *much* better place:
private static boolean solrCoreExists(String coreName, String
solrRootUrl) throws IOException, SolrServerException
{
CommonsHttpSolrServer adminServer = new
CommonsHttpSolrServer(solrRootUrl);
CoreAdminResponse status =
CoreAdminRequest.getStatus(coreName, adminServer);
return status.getCoreStatus(coreName).get(instanceDir) !=
null;
}
On Dec 5, 2008, at 1:09 AM, Ryan McKinley wrote:
yes:
http://localhost:8983/solr/admin/cores?action=STATUS
will give you a list of running cores. However that is not easy to
check with a simple status != 404
see:
http://wiki.apache.org/solr/CoreAdmin
On Dec 4, 2008, at 11:46 PM, Chris Hostetter wrote:
: Subject: Is there a clean way to determine whether a core exists?
doesn't the CoreAdminHandler's STATUS feature make this easy?
-Hoss
Is there a clean way to determine whether a core exists?
The ping command gives me a 500 status if the core exists, or a 404 if
it doesn't. For example, when I hit
http://doom:8983/solr/content_item_representations_20081201/admin/ping
I see
HTTP ERROR: 500
INTERNAL_SERVER_ERROR
RequestURI=/solr/admin/ping
Powered by Jetty://
(Obviously I'm using Jetty. Moving to Tomcat is on our list.)
I could depend on this behavior, but that seems ugly, so I decided to
try a probe query instead.
I am using the Solrj client library. Unfortunately, for core non-
existence or any other problem, Solrj uses an unhelpful catch-all
exception:
/** Exception to catch all types of communication / parsing
issues associated with talking to SOLR
*
* @version $Id: SolrServerException.java 555343 2007-07-11
17:46:25Z hossman $
* @since solr 1.3
*/
public class SolrServerException extends Exception {
...
}
So I have wound up, thus far, with the following code:
private boolean solrCoreExists(String url)
throws SolrException, MalformedURLException,
SolrServerException
{
try {
SolrQuery solrQuery = new SolrQuery();
solrQuery.setQuery(xyzzy=plugh);
new CommonsHttpSolrServer(url).query(solrQuery);
return true;
} catch (SolrServerException e) {
if (e.getCause() != null
e.getCause().getMessage().startsWith(Not Found)) {
return false;
} else {
throw e;
}
}
}
Hopefully there's a better solution?
Dean
Re: Is there a clean way to determine whether a core exists?
what about just calling:
http://doom:8983/solr/content_item_representations_20081201/select
That should give you a 404 if it does not exist.
the admin stuff will behave funny if the core does not exist (perhaps
you can file a JIRA issue for that)
ryan
On Dec 4, 2008, at 3:38 PM, Dean Thompson wrote:
The ping command gives me a 500 status if the core exists, or a 404
if it doesn't. For example, when I hit
http://doom:8983/solr/content_item_representations_20081201/admin/ping
I see
HTTP ERROR: 500
INTERNAL_SERVER_ERROR
RequestURI=/solr/admin/ping
Powered by Jetty://
(Obviously I'm using Jetty. Moving to Tomcat is on our list.)
I could depend on this behavior, but that seems ugly, so I decided
to try a probe query instead.
I am using the Solrj client library. Unfortunately, for core non-
existence or any other problem, Solrj uses an unhelpful catch-all
exception:
/** Exception to catch all types of communication / parsing
issues associated with talking to SOLR
*
* @version $Id: SolrServerException.java 555343 2007-07-11
17:46:25Z hossman $
* @since solr 1.3
*/
public class SolrServerException extends Exception {
...
}
So I have wound up, thus far, with the following code:
private boolean solrCoreExists(String url)
throws SolrException, MalformedURLException,
SolrServerException
{
try {
SolrQuery solrQuery = new SolrQuery();
solrQuery.setQuery(xyzzy=plugh);
new CommonsHttpSolrServer(url).query(solrQuery);
return true;
} catch (SolrServerException e) {
if (e.getCause() != null
e.getCause().getMessage().startsWith(Not Found)) {
return false;
} else {
throw e;
}
}
}
Hopefully there's a better solution?
Dean
Re: Is there a clean way to determine whether a core exists?
Thanks for the quick response, Ryan! Actually, my admin/ping call gives me a 404 if the core doesn't exist, which seemed reasonable. I get the 500 if the core *did* exist. Thanks for the suggestion of using the select URL, but that gives me: HTTP ERROR: 500 null java.lang.NullPointerException at org.apache.solr.common.util.StrUtils.splitSmart(StrUtils.java:37) at org.apache.solr.search.OldLuceneQParser.parse(LuceneQParserPlugin.java: 104) at org.apache.solr.search.QParser.getQuery(QParser.java:88) at org .apache .solr.handler.component.QueryComponent.prepare(QueryComponent.java:82) at org .apache .solr .handler.component.SearchHandler.handleRequestBody(SearchHandler.java: 148) at org .apache .solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java: 131) at org.apache.solr.core.SolrCore.execute(SolrCore.java:1204) at org .apache .solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:303) at org .apache .solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:232) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1089) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: 216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: 405) at org .mortbay .jetty .handler.ContextHandlerCollection.handle(ContextHandlerCollection.java: 211) at org .mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java: 114) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139) at org.mortbay.jetty.Server.handle(Server.java:285) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: 502) at org.mortbay.jetty.HttpConnection $RequestHandler.headerComplete(HttpConnection.java:821) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:208) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:378) at org.mortbay.jetty.bio.SocketConnector $Connection.run(SocketConnector.java:226) at org.mortbay.thread.BoundedThreadPool $PoolThread.run(BoundedThreadPool.java:442) RequestURI=/solr/content_item_representations_20081201/select On Dec 4, 2008, at 3:48 PM, Ryan McKinley wrote: http://doom:8983/solr/content_item_representations_20081201/select
Re: Is there a clean way to determine whether a core exists?
: Subject: Is there a clean way to determine whether a core exists? doesn't the CoreAdminHandler's STATUS feature make this easy? -Hoss
Re: Is there a clean way to determine whether a core exists?
SOLR-880 is an issue raised for the same On Fri, Dec 5, 2008 at 10:16 AM, Chris Hostetter [EMAIL PROTECTED] wrote: : Subject: Is there a clean way to determine whether a core exists? doesn't the CoreAdminHandler's STATUS feature make this easy? -Hoss -- --Noble Paul
Re: Is there a clean way to determine whether a core exists?
On Dec 4, 2008, at 3:57 PM, Dean Thompson wrote: Thanks for the quick response, Ryan! Actually, my admin/ping call gives me a 404 if the core doesn't exist, which seemed reasonable. I get the 500 if the core *did* exist. aaah -- check what ping query you have configured and make sure that is a valid query. If you use the example one and then change your schema it may be referencing fields that don't exist and give you the 500 Thanks for the suggestion of using the select URL, but that gives me: java.lang.NullPointerException at org.apache.solr.common.util.StrUtils.splitSmart(StrUtils.java:37) This is a really stupid error we need to fix -- it should actually say: missing required parameter q https://issues.apache.org/jira/browse/SOLR-435 ryan
Re: Is there a clean way to determine whether a core exists?
yes: http://localhost:8983/solr/admin/cores?action=STATUS will give you a list of running cores. However that is not easy to check with a simple status != 404 see: http://wiki.apache.org/solr/CoreAdmin On Dec 4, 2008, at 11:46 PM, Chris Hostetter wrote: : Subject: Is there a clean way to determine whether a core exists? doesn't the CoreAdminHandler's STATUS feature make this easy? -Hoss
