There are a large set of changes in this ticket including:
- Release checkpoint transaction before syncing.
- Replace write leaves phase of checkpoints with a mode that steps down the dirty content in cache using eviction.
- Change the default eviction dirty trigger (20) and target (5)
While measuring the workload in WT-2747, I noticed that transaction IDs stayed pinned while a checkpoint was waiting for updates to sync.
This dates back to WT-1982 and SERVER-18316: the checkpoint's transaction snapshot is released before the sync, but that no longer clears the global "checkpoint pinned" transaction ID.
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WT-2666 Enhance eviction_dirty_trigger to help bound checkpoint duration
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SERVER-22906 MongoD uses excessive memory over and above the WiredTiger cache size
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