Never mind. I figured it out. It was due to a NPE on the missing updateLog in solrconfig.xml. My solrconfig.xml is from an older Solr release, which doesn't have certain required sections, etc. After adding them to solrconfig.xml per this official doc, everything started to work.
http://wiki.apache.org/solr/SolrCloud#Required_Config Regards, HaiXin On 09/16/2013 04:55 PM, HaiXin Tie wrote: Sorry but I've fixed some typos, updated text: Hello Solr experts, For some strange reason, collection alias does not work in my Solr instance when more than one collection is used. I would appreciate your help. # Here is my setup, which is quite simple: Zookeeper: 3.4.5 (used to upconfig/linkconfig collections and configs for c1 and c2) Solr: version 4.4.0, with two collections c1 and c2 (solr.xml included) created using remote core API calls # Symptoms: 1. Solr queries to each individual collection works fine: http://localhost:8983/solr/c1/select?q=*:* http://localhost:8983/solr/c2/select?q=*:* 2. CREATEALIAS name=cx for c1 or c2 alone (e.g. 1-1 mapping) works fine: http://localhost:8983/solr/cx/select?q=*:* 3. CREATEALIAS name=cx for c1 and c2 does not work: # Solr request/response to the collection alias (success): curl -s "http://localhost:8983/solr/admin/collections?action=CREATEALIAS&name=cx&collections=c1,c2";<http://localhost:8983/solr/admin/collections?action=CREATEALIAS&name=cx&collections=c1,c2> <?xml version="1.0" encoding="UTF-8"?> <response> <lst name="responseHeader"><int name="status">0</int><int name="QTime">134</int></lst> </response> # Solr query using the alias fails with Error 503: "no servers hosting shard" http://localhost:8983/solr/cx/select?q=*:* <response><lst name="responseHeader"><int name="status">503</int><int name="QTime">2</int><lst name="params"><str name="q">*:*</str></lst></lst><lst name="error"><str name="msg">no servers hosting shard: </str><int name="code">503</int></lst></response> # Solr logs: 3503223 [qtp724646150-11] ERROR org.apache.solr.core.SolrCore ? org.apache.solr.common.SolrException: no servers hosting shard: at org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:149) at org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:119) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) 3503224 [qtp724646150-11] INFO org.apache.solr.core.SolrCore ? [c1] webapp=/solr path=/select params={q=*:*} status=503 QTime=2 # solr.xml <?xml version="1.0" encoding="UTF-8" ?> <solr persistent="true" sharedLib="lib"> <cores host="${host:}" adminPath="/admin/cores" hostPort="${jetty.port:}" hostContext="${hostContext:solr}"> <core shard="shard1" instanceDir="c1/" name="c1" collection="c1"/> <core shard="shard1" instanceDir="c2/" name="c2" collection="c2"/> </cores> </solr> # zookeeper alias (same from solr/cloud UI): [zk: localhost:2181(CONNECTED) 10] get /myroot/aliases.json {"collection":{ "cx":"c1,c2"}} cZxid = 0x110d ctime = Fri Sep 13 17:25:18 PDT 2013 mZxid = 0x18d1 mtime = Mon Sep 16 16:31:21 PDT 2013 pZxid = 0x110d cversion = 0 dataVersion = 19 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 119 numChildren = 0 BTW, I've spent a lot of time figuring out how to make zookeeper and solr work together. The commands are not complex, but making them work sometimes requires a lot of digging online, to figure out missing jars for zkCli.sh, etc. I know a lot of things are changing since Solr 4.0, but I really hope the Solr documentation can be better maintained, so that people won't have to spend tons of hours figuring out simple steps (albeit complex under the hood) like this. Thanks! ________________________________ This email and any attachments may contain confidential and privileged material for the sole use of the intended recipient. Any review, copying, or distribution of this email (or any attachments) by others is prohibited. If you are not the intended recipient, please contact the sender immediately and permanently delete this email and any attachments. No employee or agent of TiVo Inc. is authorized to conclude any binding agreement on behalf of TiVo Inc. by email. Binding agreements with TiVo Inc. may only be made by a signed written agreement.
