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From "Per Steffensen (Created) (JIRA)" <>
Subject [jira] [Created] (SOLR-3273) 404 Not Found on action=PREPRECOVERY
Date Mon, 26 Mar 2012 11:02:27 GMT
404 Not Found on action=PREPRECOVERY

                 Key: SOLR-3273
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
    Affects Versions: 4.0
         Environment: Any
            Reporter: Per Steffensen

We have an application based on a recent copy of 4.0-SNAPSHOT. We have a preformance test
setup where we performance test our application (and therefore indirectly Solr(Cloud)). When
we run the performance test against a setup using SolrCloud without replication, everything
seems to run very nicely for days. When we add replication to the setup the same performance
test shows some problems - which we will report (and maybe help fix) in distinct issues here
in jira.

About the setup - the setup is a little more complex than described below, but I believe the
description will tell "enough":
We have two solr servers which we start from <solr-install>/example using this command
(ZooKeepers have been started before) - we first start solr on server1, and then starts solr
on server2 after solr on server1 finished starting up: 
nohup java -Xmx4096m -DzkHost=server1:2181,server2:2181,server3:2181
-Dbootstrap_confdir=./myapp/conf -Dcollection.configName=myapp_conf -Dsolr.solr.home=./myapp -jar start.jar >./myapp/logs/stdout.log
2>./myapp/logs/stderr.log &
The ./myapp/solr.xml looks like this on server1:
<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="false">
  <cores adminPath="/admin/myapp" host="server1" hostPort="8983" hostContext="solr">
    <core name="collA_slice1_shard1" instanceDir="." dataDir="collA_slice1_data" collection="collA"
shard="slice1" />
The ./myapp/solr.xml looks like this on server2:
<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="false">
  <cores adminPath="/admin/myapp" host="server2" hostPort="8983" hostContext="solr">
    <core name="collA_slice1_shard2" instanceDir="." dataDir="collA_slice1_data" collection="collA"
shard="slice1" />

The first thing we observe is that Solr server1 (running collA_slice1_shard1) seems to start
up nicely, but when Solr server2 (running collA_slice1_shard2) is started up later it quickly
reports the following in its solr.log an keeps doing that for a long time:
SEVERE: Error while trying to recover:org.apache.solr.common.SolrException: Not Found

request: http://server1:8983/solr/admin/cores?action=PREPRECOVERY&core=collA_slice1_shard1&nodeName=server2%3A8983_solr&coreNodeName=server2%3A8983_solr_collA_slice1_shard2&state=recovering&checkLive=true&pauseFor=6000&wt=javabin&version=2
        at org.apache.solr.common.SolrExceptionPropagationHelper.decodeFromMsg(
        at org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(
        at org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(

Please note that we have changed a little bit in the way errors are logged, but basically
this means that Solr server2 gets an "404 Not Found" on its request "http://server1:8983/solr/admin/cores?action=PREPRECOVERY&core=collA_slice1_shard1&nodeName=server2%3A8983_solr&coreNodeName=server2%3A8983_solr_collA_slice1_shard2&state=recovering&checkLive=true&pauseFor=6000&wt=javabin&version=2"
to Solr server1.

Seems like there is not a common agreement among the Solr servers on how/where to send those
requests and how/where to listen for them.

Regards, Per Steffensen

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