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Posted to dev@lucene.apache.org by "Yonik Seeley (Issue Comment Edited) (JIRA)" <ji...@apache.org> on 2011/12/06 21:17:40 UTC
[jira] [Issue Comment Edited] (SOLR-2880) Investigate adding an
overseer that can assign shards, later do re-balancing, etc
[ https://issues.apache.org/jira/browse/SOLR-2880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163792#comment-13163792 ]
Yonik Seeley edited comment on SOLR-2880 at 12/6/11 8:15 PM:
-------------------------------------------------------------
For those following along, here's what the ZK layout looks like after starting 4 nodes (with the default 3 shards).
{code}
...../NODE_ASSIGNMENTS (v=0 children=4)
ROGUE:7574_SOLR (v=4) "[{ "_collection":"collection1", "_core":"Rogue:7574_solr_", "shard_name":"shard2"}]"
ROGUE:2222_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:2222_solr_", "shard_name":"shard1"}]"
ROGUE:1111_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:1111_solr_", "shard_name":"shard3"}]"
ROGUE:8983_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:8983_solr_", "shard_name":"shard1"}]"
/NODE_STATES (v=0 children=4)
ROGUE:7574_SOLR (v=4) "[{ "shard_id":"shard2", "_collection":"collection1", "roles":"", "_core":"Rogue:7574_solr_", "s..."
ROGUE:2222_SOLR (v=2) "[{ "shard_id":"shard1", "_collection":"collection1", "roles":"", "_core":"Rogue:2222_solr_", "s..."
ROGUE:1111_SOLR (v=2) "[{ "shard_id":"shard3", "_collection":"collection1", "roles":"", "_core":"Rogue:1111_solr_", "s..."
ROGUE:8983_SOLR (v=2) "[{ "shard_id":"shard1", "_collection":"collection1", "roles":"", "_core":"Rogue:8983_solr_", "s..."
/ZOOKEEPER (v=0 children=1) ""
QUOTA (v=0) ""
/CLUSTERSTATE.JSON (v=10) "{"collection1":{ "shard1":{ "Rogue:2222_solr_":{ "shard_id":"shard1", "_collection":"collection1..."
/LIVE_NODES (v=4 children=3)
ROGUE:2222_SOLR (ephemeral v=0)
ROGUE:1111_SOLR (ephemeral v=0)
ROGUE:8983_SOLR (ephemeral v=0)
/COLLECTIONS (v=1 children=1)
COLLECTION1 (v=0 children=2) "{ "configName":"myconf", "num_shards":"3"}"
SHARDS_LOCK (v=0)
LEADER_ELECT (v=0 children=3)
SHARD1 (v=0 children=2)
ELECTION (v=0 children=2)
N_0000000001 (ephemeral v=0)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:8983_SOLR_ (ephemeral v=0) "{ "shard_id":"shard1", "roles":"", "state":"recovering", "node_name":"Rogue:8983_solr", "url":"..."
SHARD2 (v=0 children=2)
ELECTION (v=0 children=1)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:7574_SOLR_ (ephemeral v=0) "{ "shard_id":"shard2", "roles":"", "state":"recovering", "node_name":"Rogue:7574_solr", "url":"..."
SHARD3 (v=0 children=2)
ELECTION (v=0 children=1)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:1111_SOLR_ (ephemeral v=0) "{ "shard_id":"shard3", "roles":"", "state":"recovering", "node_name":"Rogue:1111_solr", "url":"..."
/OVERSEER_ELECT (v=0 children=2)
ELECTION (v=0 children=4)
N_0000000004 (ephemeral v=0)
N_0000000003 (ephemeral v=0)
N_0000000001 (ephemeral v=0)
N_0000000000 (ephemeral v=0)
LEADER (v=0)
{code}
Notes: Starting up the first node by bootstrapping fails the first time you try. Run it again and it works.
java -Dbootstrap_confdir=./solr/conf -Dcollection.configName=myconf -DzkRun -jar start.jar
was (Author: yseeley@gmail.com):
For those following along, here's what the ZK layout looks like after starting 4 nodes (with the default 3 shards).
{code}
/NODE_ASSIGNMENTS (v=0 children=4)
ROGUE:7574_SOLR (v=4) "[{ "_collection":"collection1", "_core":"Rogue:7574_solr_", "shard_name":"shard2"}]"
ROGUE:2222_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:2222_solr_", "shard_name":"shard1"}]"
ROGUE:1111_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:1111_solr_", "shard_name":"shard3"}]"
ROGUE:8983_SOLR (v=2) "[{ "_collection":"collection1", "_core":"Rogue:8983_solr_", "shard_name":"shard1"}]"
/NODE_STATES (v=0 children=4)
ROGUE:7574_SOLR (v=4) "[{ "shard_id":"shard2", "_collection":"collection1", "roles":"", "_core":"Rogue:7574_solr_", "s..."
ROGUE:2222_SOLR (v=2) "[{ "shard_id":"shard1", "_collection":"collection1", "roles":"", "_core":"Rogue:2222_solr_", "s..."
ROGUE:1111_SOLR (v=2) "[{ "shard_id":"shard3", "_collection":"collection1", "roles":"", "_core":"Rogue:1111_solr_", "s..."
ROGUE:8983_SOLR (v=2) "[{ "shard_id":"shard1", "_collection":"collection1", "roles":"", "_core":"Rogue:8983_solr_", "s..."
/ZOOKEEPER (v=0 children=1) ""
QUOTA (v=0) ""
/CLUSTERSTATE.JSON (v=10) "{"collection1":{ "shard1":{ "Rogue:2222_solr_":{ "shard_id":"shard1", "_collection":"collection1..."
/LIVE_NODES (v=4 children=3)
ROGUE:2222_SOLR (ephemeral v=0)
ROGUE:1111_SOLR (ephemeral v=0)
ROGUE:8983_SOLR (ephemeral v=0)
/COLLECTIONS (v=1 children=1)
COLLECTION1 (v=0 children=2) "{ "configName":"myconf", "num_shards":"3"}"
SHARDS_LOCK (v=0)
LEADER_ELECT (v=0 children=3)
SHARD1 (v=0 children=2)
ELECTION (v=0 children=2)
N_0000000001 (ephemeral v=0)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:8983_SOLR_ (ephemeral v=0) "{ "shard_id":"shard1", "roles":"", "state":"recovering", "node_name":"Rogue:8983_solr", "url":"..."
SHARD2 (v=0 children=2)
ELECTION (v=0 children=1)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:7574_SOLR_ (ephemeral v=0) "{ "shard_id":"shard2", "roles":"", "state":"recovering", "node_name":"Rogue:7574_solr", "url":"..."
SHARD3 (v=0 children=2)
ELECTION (v=0 children=1)
N_0000000000 (ephemeral v=0)
LEADER (v=0 children=1)
ROGUE:1111_SOLR_ (ephemeral v=0) "{ "shard_id":"shard3", "roles":"", "state":"recovering", "node_name":"Rogue:1111_solr", "url":"..."
/OVERSEER_ELECT (v=0 children=2)
ELECTION (v=0 children=4)
N_0000000004 (ephemeral v=0)
N_0000000003 (ephemeral v=0)
N_0000000001 (ephemeral v=0)
N_0000000000 (ephemeral v=0)
LEADER (v=0)
{code}
Notes: Starting up the first node by bootstrapping fails the first time you try. Run it again and it works.
java -Dbootstrap_confdir=./solr/conf -Dcollection.configName=myconf -DzkRun -jar start.jar
> Investigate adding an overseer that can assign shards, later do re-balancing, etc
> ---------------------------------------------------------------------------------
>
> Key: SOLR-2880
> URL: https://issues.apache.org/jira/browse/SOLR-2880
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.0
>
> Attachments: SOLR-2880-merge-elections.patch, SOLR-2880.patch
>
>
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