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a9b95f5f01
The operation after gate.enter() in tracker::start() can fail and throw,
we should call gate.leave() in such case to avoid unbalanced enter and
leave calls. tracker::done() has similar issue too.
Fix it by removing the gate enter and leave logic in tracker start and
done. A helper tracker::run() is introduced to take care of the gate and
repair status.
In addition, the error log is improved. It now logs exceptions on all
shards in the summary. e.g.,
[shard 0] repair - repair id 1 failed: std::runtime_error
({shard 0: std::runtime_error (error0), shard 1: std::runtime_error (error1)})
Fixes #5074