Import wiredtiger: 6a31c2118cce88c68281eda2ca9ab1df915a2773 from branch mongodb-3.4

ref: fc0e7abe82..6a31c2118c
for: 3.4.0

WT-2831       Skip creating a checkpoint if there have been no changes
WT-2858       rename wtperf's CONFIG structure
WT-2895       Reduce the runtime of make check testing with disable long
WT-2907       Bug in Java ConcurrentCloseTest case
WT-2917       split wtperf's configuration into per-database and per-run parts
WT-2920       New eviction statistics
WT-2931       Configure default in-memory dirty cache usage lower
WT-2932       Allow applications to selectively ignore cache limit with in-memory configuration
WT-2933       Fix a race between named snapshots and checkpoints
WT-2937       test_inmem01 aborts due to stuck cache
WT-2938       Assembly files should end in .sx, not .S
WT-2941       Improve test/format to use faster key-generation functions
WT-2942       verbose strings don't need newline
WT-2946       dist/s_docs incompatible with OS X Xcode installation
WT-2948       simplify error handling by making epoch time return never fail
WT-2950       Inserting multi-megabyte values can cause large in-memory pages

1 files changed, 8 insertions, 2 deletions

diff --git a/src/third_party/wiredtiger/dist/api_data.py b/src/third_party/wiredtiger/dist/api_data.py
index 9781e58a807..d02d7e4b985 100644
--- a/src/third_party/wiredtiger/dist/api_data.py
+++ b/src/third_party/wiredtiger/dist/api_data.py
@@ -183,6 +183,12 @@ file_config = format_meta + [
         configure Huffman encoding for values.  Permitted values are
         \c "none", \c "english", \c "utf8<file>" or \c "utf16<file>".
         See @ref huffman for more information'''),
+    Config('ignore_in_memory_cache_size', 'false', r'''
+        allow update and insert operations to proceed even if the cache is
+        already at capacity. Only valid in conjunction with in-memory
+        databases. Should be used with caution - this configuration allows
+        WiredTiger to consume memory over the configured cache limit''',
+        type='boolean'),
     Config('internal_key_truncate', 'true', r'''
         configure internal key truncation, discarding unnecessary
         trailing bytes on internal keys (ignored for custom
@@ -410,13 +416,13 @@ connection_runtime_config = [
     Config('eviction_dirty_target', '5', r'''
         perform eviction in worker threads when the cache contains at least
         this much dirty content, expressed as a percentage of the total cache
-        size.  Ignored if \c in_memory is \c true''',
+        size.''',
         min=1, max=99),
     Config('eviction_dirty_trigger', '20', r'''
         trigger application threads to perform eviction when the cache contains
         at least this much dirty content, expressed as a percentage of the
         total cache size. This setting only alters behavior if it is lower than
-        eviction_trigger. Ignored if \c in_memory is \c true''',
+        eviction_trigger''',
         min=1, max=99),
     Config('eviction_target', '80', r'''
         perform eviction in worker threads when the cache contains at least