[
https://issues.apache.org/jira/browse/KNOX-1041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173813#comment-16173813
]
Phil Zampino commented on KNOX-1041:
------------------------------------
There is still some concern around thread-safety. In fact, I've filed KNOX-1054
to address the similar issue in DefaultURLManager.
Basically, even though the underlying data structure is a
ConcurrentLinkedQueue, the use of that queue is not thread-safe. At a minimum,
the "read" methods must be synchronized, such that they're subject to the same
lock as the "write" methods.
> High Availability Support For Apache SOLR, HBase & Kafka
> --------------------------------------------------------
>
> Key: KNOX-1041
> URL: https://issues.apache.org/jira/browse/KNOX-1041
> Project: Apache Knox
> Issue Type: New Feature
> Components: Server
> Affects Versions: 0.12.0, 0.13.0
> Reporter: Rick Kellogg
> Assignee: Rick Kellogg
> Fix For: 0.14.0
>
> Attachments: KNOX-1041.patch
>
>
> Provide high-availability/fail-over between Knox and SOLR/HBase/Kafka using
> the existing DefaultHaDispatch mechanism and a customized URLManager
> implementation with knowledge of active hosts in Zookeeper.
> When SOLR Cloud is used the active hosts are stored in Zookeeper under the
> /live_nodes path. The attached custom URLManager implementation queries
> Zookeeper for the active hosts upon startup. In the event of fail-over, it
> updates the internal list of hosts.
> The HS2ZookeeperURLManager implementation used to provide similar
> functionality for Hive was used as a starting point.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
