Import wiredtiger: 18dfb9e58e39927696affcd8e362364e23e1aa59 from branch mongodb-4.4r4.4.0-rc4

ref: a707df12a2..18dfb9e58e
for: 4.4.0-rc4

WT-5242       Minimize checkpoints pinned during backup
WT-5470       Reduce copies and allocations in read path
WT-5673       Prepare support with durable history: modify verify and salvage as needed
WT-5677       Prepare support with durable history: add test/format stress tests
WT-5710       Review WT_PANIC usage
WT-5716       Create the history store file at the same time as creating the metadata file in wiredtiger open
WT-5839       Ignore non-globally visible tombstones for both data store and hs store in hs verification
WT-5841       Return WT_TRY_SALVAGE when the history file is removed or truncated
WT-5928       Cleanup stale FIXMEs from durable history
WT-5977       WT_SESSION_NO_RECONCILE flag set by history cursor prevents eviction
WT-5984       Allow prepared updates to be evicted in durable history
WT-6009       Prepare support with durable history: add statistic for prepared updates evicted
WT-6032       Turn on mongodb-4.4 branch upgrade/downgrade testing
WT-6051       Fix reconstructing full value from modifies for string format
WT-6068       Re-enable tests temporarily disabled during durable history development
WT-6069       Remove WT_UPDATE_RESTORED_FROM_DISK flag
WT-6070       Coverity : Copy paste error
WT-6071       Coverity : Change format specifier
WT-6086       Move time windows and aggregated time windows into structures
WT-6087       Add a C2S(cursor) macro to simplify translation from a cursor to a session
WT-6095       Verify on-disk page only for row store as part of rollback to stable
WT-6109       Cleanup usage of cursor->session
WT-6110       Cleanup cast from cbt to cursor
WT-6120       Remove use-after-free in __verify_history_store_id
WT-6130       Disable test_random_abort

1 files changed, 6 insertions, 5 deletions

diff --git a/src/third_party/wiredtiger/src/include/connection.h b/src/third_party/wiredtiger/src/include/connection.h
index f6bd37c5124..547feaa54a3 100644
--- a/src/third_party/wiredtiger/src/include/connection.h
+++ b/src/third_party/wiredtiger/src/include/connection.h
@@ -150,10 +150,10 @@ struct __wt_named_extractor {
  * WT_CONN_HOTBACKUP_START --
  *	Macro to set connection data appropriately for when we commence hot backup.
  */
-#define WT_CONN_HOTBACKUP_START(conn)   \
-    do {                                \
-        (conn)->hot_backup = true;      \
-        (conn)->hot_backup_list = NULL; \
+#define WT_CONN_HOTBACKUP_START(conn)                        \
+    do {                                                     \
+        (conn)->hot_backup_start = (conn)->ckpt_finish_secs; \
+        (conn)->hot_backup_list = NULL;                      \
     } while (0)
 
 /*
@@ -269,13 +269,14 @@ struct __wt_connection_impl {
     WT_TXN_GLOBAL txn_global; /* Global transaction state */
 
     WT_RWLOCK hot_backup_lock; /* Hot backup serialization */
-    bool hot_backup;           /* Hot backup in progress */
+    uint64_t hot_backup_start; /* Clock value of most recent checkpoint needed by hot backup */
     char **hot_backup_list;    /* Hot backup file list */
 
     WT_SESSION_IMPL *ckpt_session; /* Checkpoint thread session */
     wt_thread_t ckpt_tid;          /* Checkpoint thread */
     bool ckpt_tid_set;             /* Checkpoint thread set */
     WT_CONDVAR *ckpt_cond;         /* Checkpoint wait mutex */
+    uint64_t ckpt_finish_secs;     /* Clock value of last completed checkpoint */
 #define WT_CKPT_LOGSIZE(conn) ((conn)->ckpt_logsize != 0)
     wt_off_t ckpt_logsize; /* Checkpoint log size period */
     bool ckpt_signalled;   /* Checkpoint signalled */