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https://issues.apache.org/jira/browse/SOLR-1395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924911#action_12924911
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tom liu commented on SOLR-1395:
-------------------------------
Concurrency request would be thrown NPE.
Such as:
{noformat}
ab -n 10000 -c 5 http://solr01:8080/solr/select?q=solr&;...
{noformat}
it would be thrown NPE:
{noformat}
10/10/26 17:36:03 TRACE client.WorkQueue:261 - Done waiting, results =
ClientResult: 0 results, 0 errors, 0/2 shards (id=2359:0)
10/10/26 17:36:03 TRACE client.WorkQueue:270 - Shutting down work queue,
results = ClientResult: 0 results, 0 errors, 0/2 shards (id=2359:0)
10/10/26 17:36:03 TRACE client.ClientResult:286 - close() called.
10/10/26 17:36:03 TRACE client.ClientResult:290 - Notifying closed listener.
10/10/26 17:36:03 TRACE client.WorkQueue:136 - Shut down via
ClientRequest.close()
10/10/26 17:36:03 TRACE client.WorkQueue:188 - Shutdown() called (id=2359)
10/10/26 17:36:03 TRACE client.WorkQueue:277 - Returning results =
ClientResult: 0 results, 0 errors, 0/2 shards (closed), took 10003 ms
(id=2359:0)
10/10/26 17:36:03 DEBUG client.Client:427 -
broadcast(request([Ljava.lang.Object;@7cf02bee),
{solr03:20000=[solrhome01#solrhome01, solrhome02#solrhome02]}) took 10004 msec
for ClientResult: 0 results, 0 errors, 0/2 shards (closed)
10/10/26 17:36:03 INFO component.SearchHandler:89 - KattaCommComponent
results.size: 0
10/10/26 17:36:03 WARN component.SearchHandler:93 - Received 0 responses for
query [], not 1
10/10/26 17:36:03 ERROR core.SolrCore:151 - java.lang.NullPointerException
at
org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:553)
at
org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:435)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:304)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
{noformat}
But use
{noformat}
ab -n 10000 -c 1 http://solr01:8080/solr/select?q=solr&;...
{noformat}
do not thrown
BTW::
NPE would stop RPC communication in request method of SolrKattaServer.java
> Integrate Katta
> ---------------
>
> Key: SOLR-1395
> URL: https://issues.apache.org/jira/browse/SOLR-1395
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 1.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: Next
>
> Attachments: back-end.log, front-end.log, hadoop-core-0.19.0.jar,
> katta-core-0.6-dev.jar, katta.node.properties, katta.zk.properties,
> log4j-1.2.13.jar, solr-1395-1431-3.patch, solr-1395-1431-4.patch,
> solr-1395-1431-katta0.6.patch, solr-1395-1431-katta0.6.patch,
> solr-1395-1431.patch, solr-1395-katta-0.6.2-1.patch,
> solr-1395-katta-0.6.2.patch, SOLR-1395.patch, SOLR-1395.patch,
> SOLR-1395.patch, test-katta-core-0.6-dev.jar, zkclient-0.1-dev.jar,
> zookeeper-3.2.1.jar
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> We'll integrate Katta into Solr so that:
> * Distributed search uses Hadoop RPC
> * Shard/SolrCore distribution and management
> * Zookeeper based failover
> * Indexes may be built using Hadoop
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