[
https://issues.apache.org/jira/browse/SOLR-9835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Cao Manh Dat updated SOLR-9835:
-------------------------------
Attachment: SOLR-9835.patch
Updated patch for this issue :
- Remove {{UpdateCommand.NOTICE_INDEXWRITER}} flag by not replaying buffer log
if the updates is not made to IW. This changes help the patch more compact
- When replica recover,
- replica won't apply buffer updates
- fix bug: RTG support for buffering updates ( along with test )
- {{ZkController.replicateFromLeaders}} is thread-safe now
- When cluster restart, only leaders should call {{ulog.recoverFromLog()}},
tested by TestCloudRecovery
- {{OnlyLeaderIndexesTest}}
- test for RTG
- test for replicas are consistent
- more test for replica recovery
- More tests and fixed bugs
I will try to write more tests for all possible cases during Replica Recovery
and Leader Election. Hoping that I can find more bugs by doing this.
> Create another replication mode for SolrCloud
> ---------------------------------------------
>
> Key: SOLR-9835
> URL: https://issues.apache.org/jira/browse/SOLR-9835
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Cao Manh Dat
> Assignee: Shalin Shekhar Mangar
> Attachments: SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch,
> SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch, SOLR-9835.patch
>
>
> The current replication mechanism of SolrCloud is called state machine, which
> replicas start in same initial state and for each input, the input is
> distributed across replicas so all replicas will end up with same next state.
> But this type of replication have some drawbacks
> - The commit (which costly) have to run on all replicas
> - Slow recovery, because if replica miss more than N updates on its down
> time, the replica have to download entire index from its leader.
> So we create create another replication mode for SolrCloud called state
> transfer, which acts like master/slave replication. In basically
> - Leader distribute the update to other replicas, but the leader only apply
> the update to IW, other replicas just store the update to UpdateLog (act like
> replication).
> - Replicas frequently polling the latest segments from leader.
> Pros:
> - Lightweight for indexing, because only leader are running the commit,
> updates.
> - Very fast recovery, replicas just have to download the missing segments.
> To use this new replication mode, a new collection must be created with an
> additional parameter {{liveReplicas=1}}
> {code}
> http://localhost:8983/solr/admin/collections?action=CREATE&name=newCollection&numShards=2&replicationFactor=1&liveReplicas=1
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
