[ https://issues.apache.org/jira/browse/ZOOKEEPER-856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris Nauroth updated ZOOKEEPER-856: ------------------------------------ Fix Version/s: (was: 3.5.2) 3.5.3 > Connection imbalance leads to overloaded ZK instances > ----------------------------------------------------- > > Key: ZOOKEEPER-856 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-856 > Project: ZooKeeper > Issue Type: Bug > Reporter: Travis Crawford > Assignee: Mahadev konar > Fix For: 3.6.0, 3.5.3 > > Attachments: zk_open_file_descriptor_count_members.gif, > zk_open_file_descriptor_count_total.gif > > > We've experienced a number of issues lately where "ruok" requests would take > upwards of 10 seconds to return, and ZooKeeper instances were extremely > sluggish. The sluggish instance requires a restart to make it responsive > again. > I believe the issue is connections are very imbalanced, leading to certain > instances having many thousands of connections, while other instances are > largely idle. > A potential solution is periodically disconnecting/reconnecting to balance > connections over time; this seems fine because sessions should not be > affected, and therefore ephemaral nodes and watches should not be affected. -- This message was sent by Atlassian JIRA (v6.3.4#6332)