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Posted to dev@lucene.apache.org by "Cao Manh Dat (JIRA)" <ji...@apache.org> on 2018/11/12 09:55:04 UTC
[jira] [Updated] (SOLR-12969) Inconsistency with leader when
PeerSync return ALREADY_IN_SYNC
[ https://issues.apache.org/jira/browse/SOLR-12969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cao Manh Dat updated SOLR-12969:
--------------------------------
Summary: Inconsistency with leader when PeerSync return ALREADY_IN_SYNC (was: Solr replication failure)
> Inconsistency with leader when PeerSync return ALREADY_IN_SYNC
> --------------------------------------------------------------
>
> Key: SOLR-12969
> URL: https://issues.apache.org/jira/browse/SOLR-12969
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: replication (java)
> Reporter: Jeremy Smith
> Assignee: Cao Manh Dat
> Priority: Major
> Attachments: SOLR-12969.patch, SOLR-12969.patch, SOLR-12969.patch
>
>
> Under certain circumstances, replication fails between a leader and follower. The follower will not receive updates from the leader, even though the leader has a newer version. If the leader is restarted, it will get the older version from the follower.
>
> This was discussed on the [mailing list|https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201810.mbox/%3CBYAPR04MB4406710795EA07E93BF80913ADCD0%40BYAPR04MB4406.namprd04.prod.outlook.com%3E] and [~risdenk] [wrote a script|https://github.com/risdenk/test-solr-start-stop-replica-consistency] that demonstrates this error. He also verified that the error occurs when the script is run outside of docker.
>
> Here is the scenario of the failure:
> * A collection with 1 shards and 2 replicas
> * Stop non-leader replica (B)
> * Index more than 100 documents to the collection
> * Start replica B, it failed to do PeerSync and starts segments replication
> * Index document 101th to the collection
> ** Leader's tlog: [1, 2, 3, ..., 100, 101]
> ** Replica's tlog: [101]
> * Stop replica B
> * Index document 102th to the collection
> * Start replica B, on doing PeerSync
> ** Leader's tlog: [1, 2, 3, ..., 100, 101, 102]
> ** Replica's tlog: [101]
> ** Leader's high (80th): 80
> ** Replica's low: 101
> ** By comparison: replica's low > leader's high => ALREADY_IN_SYNC
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