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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7569) Create an API to force a leader election between nodes
Date Sat, 19 Sep 2015 12:43:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14877089#comment-14877089
] 

Mark Miller commented on SOLR-7569:
-----------------------------------

I wonder if Recover is the right terminology. It seems so broad and "fix anything" like. Perhaps
it should be something close to 'forceleader' - something that is specific about what is happening
and gives an idea that you are overriding the system as you are.

> Create an API to force a leader election between nodes
> ------------------------------------------------------
>
>                 Key: SOLR-7569
>                 URL: https://issues.apache.org/jira/browse/SOLR-7569
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>              Labels: difficulty-medium, impact-high
>         Attachments: SOLR-7569.patch, SOLR-7569.patch, SOLR-7569.patch, SOLR-7569.patch,
SOLR-7569.patch, SOLR-7569.patch, SOLR-7569.patch, SOLR-7569.patch, SOLR-7569.patch, SOLR-7569_lir_down_state_test.patch
>
>
> There are many reasons why Solr will not elect a leader for a shard e.g. all replicas'
last published state was recovery or due to bugs which cause a leader to be marked as 'down'.
While the best solution is that they never get into this state, we need a manual way to fix
this when it does get into this  state. Right now we can do a series of dance involving bouncing
the node (since recovery paths between bouncing and REQUESTRECOVERY are different), but that
is difficult when running a large cluster. Although it is possible that such a manual API
may lead to some data loss but in some cases, it is the only possible option to restore availability.
> This issue proposes to build a new collection API which can be used to force replicas
into recovering a leader while avoiding data loss on a best effort basis.



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