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https://issues.apache.org/jira/browse/SOLR-9236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366381#comment-15366381
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ASF subversion and git services commented on SOLR-9236:
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Commit c58841558354c9b27fe502cad60907a62645bf3b in lucene-solr's branch
refs/heads/master from markrmiller
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=c588415 ]
SOLR-9236: Fix import.
> AutoAddReplicas feature with one replica loses some documents not committed
> during failover
> -------------------------------------------------------------------------------------------
>
> Key: SOLR-9236
> URL: https://issues.apache.org/jira/browse/SOLR-9236
> Project: Solr
> Issue Type: Bug
> Components: hdfs, SolrCloud
> Reporter: Eungsop Yoo
> Assignee: Mark Miller
> Priority: Minor
> Attachments: SOLR-9236.patch, SOLR-9236.patch
>
>
> I need to index huge amount of logs, so I decide to use AutoAddReplica
> feature with only one replica.
> When using AutoAddReplicas with one replica, some benefits are expected.
> - no redundant data files for replicas
> -- saving disk usage
> - best indexing performance
> I expected that Solr fails over just like HBase.
> The feature worked almost as it was expected, except for some missing
> documents during failover.
> I found two regions for the missing.
> 1. The leader replica does not replay any transaction logs. But when there is
> only one replica, it should be the leader.
> So I made the leader replica replay the transaction logs when using
> AutoAddReplicas with on replica.
> But the above fix did not resolve the problem.
> 2. As failover occurred, the transaction log directory had a deeper directory
> depth. Just like this, tlog/tlog/tlog/...
> The transaction log could not be replayed, because the transaction log
> directory was changed during failover.
> So I made the transaction log directory not changed during failover.
> After these fixes, AutoAddReplicas with one replica fails over well without
> losing any documents.
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