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[DLOG] Sync zk before opening ledger
DLog uses a separate zookeeper session for dlog metadata and bookkeeper metadata. This can introduce a race condition when a dlog client creates a new segment and adds it to a log. If the dlog metadata session has a newer view of the data than the bookkeeper metadata session, then the dlog session will see there's a new segment to be opened, but the zk session will throw a NoSuchLedger exception when it actually tries to open it. To solve this, we need to tell the bookkeeper zk session to ensure it has the latest view of the data at the moment it tries to open a ledger.
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