a data node has much higher data usage
Hi, all,
After a restart of the cluster, one of the data nodes has much higher data usage than others. Others is 78%, and this one is 92%. And the other one from the same Nodegroup of the problem one also has 78% data usage as others.
Have any idea why this happens?
Let me explain more about what happened:
Today, when I was doing some queries on the cluster database, I suddenly got a error:
ERROR 1296 (HY000): Got error 157 'Unknown error code' from NDBCLUSTER
And before that, all things were good. Then we checked ndb manager to see what happened, and surprisingly, we found the ndb manage stopped working 10 days ago, as the database update was always correct, we did not notice that on time. But after check the ndb manager log file, nothing unusual is logged. Therefore, we have no idea why the ndb manager stopped working, neither why the data nodes stopped working. Then, we restart the ndb manager, and the data nodes, then the data usage of one data node is much higher than others.