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https://issues.apache.org/jira/browse/SOLR-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466680#comment-16466680
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Jan Høydahl commented on SOLR-7767:
-----------------------------------
Here is screenshot from a new "Zookeeper" tab in the cloud section:
!zk-status-tab.png|width=700!
It takes zkHost string and talks directly to each configured zookeeper using
the low-level socket API
"[four-letter-word|https://zookeeper.apache.org/doc/r3.4.11/zookeeperAdmin.html#sc_zkCommands]";
and returns monitoring status (MNTR) as well as configuration details (CONF)
for each ZK. It will also print warnings if there is an odd number of nodes, if
there is a mix of standalone and ensemble nodes and other warning states.
The API is added to {{ZookeeperInfoHandler}}, with parameter {{mntr=true}}.
Example:
[http://localhost:8983/solr/admin/zookeeper?mntr=true]
{code}
{
"responseHeader": {
"QTime": 24,
"status": 0
},
"zkStatus": {
"details": [{
"clientPort": "9983",
"dataDir":
"/Users/janhoy/git/lucene-solr/solr/server/solr/zoo_data/version-2",
"dataLogDir":
"/Users/janhoy/git/lucene-solr/solr/server/solr/zoo_data/version-2",
"host": "localhost:9983",
"maxClientCnxns": "60",
"maxSessionTimeout": "40000",
"minSessionTimeout": "4000",
"ok": true,
"serverId": "0",
"tickTime": "2000",
"zk_approximate_data_size": "210920",
"zk_avg_latency": "0",
"zk_ephemerals_count": "3",
"zk_max_file_descriptor_count": "10240",
"zk_max_latency": "4",
"zk_min_latency": "0",
"zk_num_alive_connections": "3",
"zk_open_file_descriptor_count": "158",
"zk_outstanding_requests": "0",
"zk_packets_received": "165",
"zk_packets_sent": "167",
"zk_server_state": "standalone",
"zk_version": "3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on
11/01/2017 18:06 GMT",
"zk_watch_count": "18",
"zk_znode_count": "79"
}],
"ensembleSize": 1,
"mode": "standalone",
"status": "green"
}
}
{code}
Here's an example of an error (one zk cannot be reached):
!zk-status-error.png|width=700!
> Zookeeper Ensemble Admin UI
> ---------------------------
>
> Key: SOLR-7767
> URL: https://issues.apache.org/jira/browse/SOLR-7767
> Project: Solr
> Issue Type: New Feature
> Components: Admin UI, SolrCloud
> Reporter: Aniket Khare
> Assignee: Jan Høydahl
> Priority: Major
> Attachments: image-2018-05-08-02-26-29-989.png, zk-status-error.png,
> zk-status-tab.png
>
>
> For SolrCloud mode can we have the functionality to display the live nodes
> from the zookeeper ensemble. So that user can easily get to know if any of
> zookeeper instance is down or having any other issue.
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