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From "Christine Poerschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5209) cores/action=UNLOAD of last replica removes shard from clusterstate
Date Mon, 02 Sep 2013 17:43:51 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756189#comment-13756189
] 

Christine Poerschke commented on SOLR-5209:
-------------------------------------------

+original clusterstate (extract)+
{noformat}
shards : {
  "shard1":{ "range":"...", "replicas":{ { "core":"collection1_shard1" } } },
  "shard2":{ "range":"...", "replicas":{ { "core":"collection1_shard2" } } }
}
{noformat}

+actual clusterstate after UNLOAD of collection1_shard1+
{noformat}
shards : {
  "shard2":{ "range":"...", "replicas":{ { "core":"collection1_shard2" } } }
}
{noformat}

+expected clusterstate after UNLOAD of collection1_shard1+
{noformat}
shards : {
  "shard1":{ "range":"...", "replicas":{} },
  "shard2":{ "range":"...", "replicas":{ { "core":"collection1_shard2" } } }
}
{noformat}

                
> cores/action=UNLOAD of last replica removes shard from clusterstate
> -------------------------------------------------------------------
>
>                 Key: SOLR-5209
>                 URL: https://issues.apache.org/jira/browse/SOLR-5209
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.4
>            Reporter: Christine Poerschke
>         Attachments: SOLR-5209.patch
>
>
> The problem we saw was that unloading of an only replica of a shard deleted that shard's
info from the clusterstate. Once it was gone then there was no easy way to re-create the shard
(other than dropping and re-creating the whole collection's state).
> This seems like a bug?
> Overseer.java around line 600 has a comment and commented out code:
> // TODO TODO TODO!!! if there are no replicas left for the slice, and the slice has no
hash range, remove it
> // if (newReplicas.size() == 0 && slice.getRange() == null) {
> // if there are no replicas left for the slice remove it

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