Shalin Shekhar Mangar created SOLR-7129:
-------------------------------------------
Summary: CloudSolrClient can put excessive load on ZooKeeper for
collections with stateFormat=2
Key: SOLR-7129
URL: https://issues.apache.org/jira/browse/SOLR-7129
Project: Solr
Issue Type: Bug
Components: SolrCloud, SolrJ
Affects Versions: 5.0
Reporter: Shalin Shekhar Mangar
Fix For: Trunk, 5.1
Each stale state response from the server causes CloudSolrClient to evict the
requested collection from the local cache. At this point, the request is
retried and the latest collection state is fetched live from ZooKeeper. There
is nothing preventing multiple request threads to simultaneously hit ZooKeeper
and cause a thundering herd effect.
We must not only synchronise such refreshes but also use the past and current
znode version of the cluster state to make sure that redundant fetches from
ZooKeeper are never possible.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
