Issues with procedure to close ledger
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Key: ZOOKEEPER-400
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-400
Project: Zookeeper
Issue Type: Bug
Components: contrib-bookkeeper
Reporter: Flavio Paiva Junqueira
Priority: Critical
When running a few experiments with BookKeeper, I found a couple of issues with
closing a ledger:
* On ClientCBWorker::run(), we should call setAddConfirmed before invoking the
callback method. Otherwise, it is possible that an application closes a ledger
before ClientCBWorker modifies the last confirmed operation, and the value
written to ZooKeeper won't be the last one written;
* LedgerHandle should write the last add confirmed instead of the last counter.
The last attribute counts the operations issued, and we use it to determine the
id of the next entry. If an application calls close upon receiving all
callbacks, then with the previous modification, the last confirmed add must be
equal to (last-1). However, if an application invokes close before receiving
all callbacks, the ledger may be left in an inconsistent state because the last
entry written to ZooKeeper may be an operation that hasn't completed yet.
Although the modifications required are simple, they are important.
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