[jira] [Updated] (SOLR-11656) TLOG replication doesn't work properly after rebalancing leaders.

["Yuki Yano (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuki Yano updated SOLR-11656:
-----------------------------
    Attachment: SOLR-11656.patch

Add code for restarting replication threads while rebalancing leaders.

> TLOG replication doesn't work properly after rebalancing leaders.
> -----------------------------------------------------------------
>
>                 Key: SOLR-11656
>                 URL: https://issues.apache.org/jira/browse/SOLR-11656
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: replication (java)
>    Affects Versions: 7.1
>            Reporter: Yuki Yano
>         Attachments: SOLR-11656.patch
>
>
> With TLOG replica type, the replication may stop after invoking rebalance leaders API.
> This can be reproduced by following steps:
> # Create SolrCloud with TLOG replica type.
> # Set perferredleader flag to some of no-leader nodes.
> # Invoke rebalance leaders API.
> # The replication stops in nodes which were "leader" before rebalancing. 
> Because the leader node doesn't have the replication thread, we need to create it when the status is changed from "leader" to "replica".
> On the other hand, rebalance leaders API doesn't consider this matter, and the replication may stop if the status is changed from "leader" to "replica" by rebalance leaders.



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