What can cause error "The application failed to retrieve data from the server. Retry the operation."

Troubleshooting

Problem

In i2 Analyst's Notebook Premium after a successful login to the Information Store server, running any type of search causes an error:

"The application failed to retrieve data from the server. Retry the operation."

Diagnosing The Problem

A possible cause for this error is that the Solr Server has stopped. There are several ways to check the status of Solr.

1. You can check your Solr status from the following browser URL on your Solr Server system:

http://localhost:8983/solr/#/~cloud

If you cannot load the site, Solr is down. If you are prompted to login, use the Solr credentials in the ...\toolkit\configuration\environment\credentials.properties file.

2. On the i2 Analyze server, check the application messages.log located in the deployment path of your installation:

...\deploy\wlp\usr\servers\opal-server\logs\messages\messages.log

You will find errors like the following:

[5/17/21 14:22:46:350 EDT] 0001f0ff SystemOut                                                    O 2021-05-17 14:22:46,345 - [com.i2group.apollo.common.toolkit.internal.ConsoleLogger] - (opal-services-is) - Errors occurred accessing system resources from TextSearchResourceDelegate. The likely cause is logged at FATAL. (The full exception is logged at WARNING if enabled):
[5/17/21 14:22:46:351 EDT] 0001f0ff SystemOut                                                    O 2021-05-17 14:22:46,351 - [com.i2group.apollo.common.toolkit.internal.ConsoleLogger] - (opal-services-is) - org.apache.solr.common.SolrException: Could not find a healthy node to handle the request.
[5/17/21 14:23:03:433 EDT] 0001f0f5 SystemOut                                                    O 2021-05-17 14:23:03,433 - [com.i2group.apollo.common.toolkit.internal.ConsoleLogger] - (opal-services-is) - ResultSetCleaner encountered a problem while communicating with Solr: org.apache.solr.common.SolrException: Could not find a healthy node to handle the request.

or entries like this:

[4/8/21 13:46:33:507 CDT] 000003ff com.ibm.ws.logging.internal.impl.IncidentImpl I FFDC1015I: An FFDC Incident has been created: "com.i2group.disco.search.solr.internal.SolrRuntimeException: org.apache.solr.client.solrj.SolrServerException: No live SolrServers available to handle this request:[http://<hostname>:8983/solr/main_index] org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor 267" at ffdc_21.04.08_13.46.33.0.log

The errors indicate that Solr is not responding.

3. Check the solr logs to see if the server is running, but stuck:

...\deploy\solr\server\logs\8983\solr.log

4. In the solr logs directory (...\deploy\solr\server\logs\8983), check if you see files with names like this:

solr_oom_killer-8983-2021-04-08_13_46_09.log

These files indicate Solr was terminated due to an Out Of Memory condition.

Resolving The Problem

If Solr does not respond from the url (http://localhost:8983/solr/#/~cloud), then restart both Solr and Zookeeper with the following command from the ...\toolkit\scripts directory:

./setup -t restartSolrAndZk

However, if in the Solr log directory you see files like solr_oom_killer*.log, then you are getting an Out of Memory condition and you need to increase the amount of memory for the Solr server. The default Max Memory size for Solr is 2 GB. Check your system resources to make sure you can increase the Memory for Solr on the system.

Edit the ...\toolkit\configuration\environment\topology.xml file to increase the Solr memory value in the solr-node configuration. For example:

      <solr-nodes>
         <solr-node memory="16g" id="node1" host-name="SolrServer.ibm.com" data-dir="C:/IBM/i2EIA/data/solr" port-number="8983"/>
      </solr-nodes>

After changing the value, you need to redeploy the change:

./setup -t stop -s opal-server

./setup -t deploy -s opal-server

./setup -t start -s opal-server

Document Location

Worldwide

[{"Type":"SW","Line of Business":{"code":"LOB24","label":"Security Software"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSXVXZ","label":"IBM i2 Enterprise Insight Analysis"},"ARM Category":[{"code":"a8m0z000000cwjXAAQ","label":"i2 Enterprise Insight Analysis->Info Store"}],"ARM Case Number":"TS005387300","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Version(s)"}]

Product Synonym

EIA; ANBP; ANB: Investigate

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Document Information

Modified date:
17 May 2021

UID

ibm16453763

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