/*
     * Acquire a snapshot if coming through the eviction thread route. Also, if we have entered
     * eviction through application threads and we have a transaction snapshot, we will use our
     * existing snapshot to evict pages that are not globally visible based on the last_running
     * transaction. Avoid using snapshots when application transactions are in the final stages of
     * commit or rollback as they have already released the snapshot. Otherwise, it becomes harder
     * in the later part of the code to detect updates that belonged to the last running application
     * transaction.
     */
    use_snapshot_for_app_thread = !F_ISSET(session, WT_SESSION_INTERNAL) &&
      !WT_IS_METADATA(session->dhandle) && WT_SESSION_TXN_SHARED(session)->id != WT_TXN_NONE &&
      F_ISSET(session->txn, WT_TXN_HAS_SNAPSHOT);