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The server sends sync requests to clients when it sees that they have open log trees that need to be committed for log merging to proceed. These are currently sent in the context of each client's get_log_trees request, resulting in sync requests queued for one client from all clients. Depending on message delivery and commit latencies, this can create a sync storm. The server's sends are reliable and the open commits are marked with the seq when they opened. It's easy for us to record having sent syncs to all open commits so that future attempts can be avoided. Later open commits will have higher seqs and will get a new round of syncs sent. Signed-off-by: Zach Brown <zab@versity.com>