On 10/11/2017 8:22 PM, Gunalan V wrote:
Could someone please let me know what this user-level keeper exception in zookeeper mean? and How to fix the same.
Those are not errors. They are INFO logs. They are not an indication of a problem. If they were a problem, they would most likely be at the WARN or ERROR level instead of INFO.
The message indicates that 16 requests came in to create "/overseer" in the zookeeper database. These requests all failed because that entry in the database was already there. The failure is just information, not an error.
All of the requests indicate that they came from session ID 0x35f0e3edd390001. An earlier entry in the log indicates that this session is a connection from 10.138.66.12.
The code in Solr that creates that ZK node looks like it is called in MANY places. Once of those places is the code for leader elections. This probably means that it gets called at least once for every shard in the entire cloud on each Solr node startup, and could be called quite frequently for other reasons.
It could be argued that this code in Solr should check for the existence of the node before it tries to create it, but as I already said, this isn't a problem.
Thanks, Shawn
