Benedict created CASSANDRA-7705: ----------------------------------- Summary: Safer Resource Management Key: CASSANDRA-7705 URL: https://issues.apache.org/jira/browse/CASSANDRA-7705 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Benedict Fix For: 3.0
We've had a spate of bugs recently with bad reference counting. these can have potentially dire consequences, generally either randomly deleting data or giving us infinite loops. Since in 2.1 we only reference count resources that are relatively expensive and infrequently managed, we could without any negative consequences (and only slight code complexity) introduce a safer resource management scheme. Basically, I propose when we want to acquire a resource we allocate an object that manages the reference. This can only be released once; if it is released twice, we fail immediately at the second release, reporting where the bug is (rather than letting it continue fine until the next correct release corrupts the count). The reference counter remains the same, but we obtain guarantees that the reference count itself is never badly maintained, although code using it could mistakenly release its own handle early (typically this is only an issue when cleaning up after a failure, in which case under the new scheme this would be an innocuous error) -- This message was sent by Atlassian JIRA (v6.2#6252)