liutang123 edited a comment on issue #3294: Use read lock when iterate tablet_map in TabletManager::start_trash_sweep URL: https://github.com/apache/incubator-doris/pull/3294#issuecomment-612041189 > > By add logs, we found that `TabletManager::start_trash_sweep` will take write lock for a long time. > > How long? And after this PR applied, how long will it be? We set `tablet_map_shard_size` to 16, this function will holds each map lock about more than 1 second. After this PR, this function holds write lock less than 100 ms.
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