Description
When the cache is small we can allow internal pages to grow large enough that the cache becomes stuck.
The test/format configuration at the bottom of this report ended up with a cache containing 4 pages. Two pages for the metadata (that can't be evicted). Two internal pages in a tree:
0x98f790: row-store internal
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disk 0x98f710, entries 7, dirty, disk-alloc, write generation=2
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0x7fa9880b5e70: row-store internal
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disk 0x7fa98806b000, entries 4981, dirty, disk-alloc, write generation=6
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The configured cache size is 2MB and these 4 pages take up 2.5 MB. The second page with nearly 5000 entries is so large we can no longer make progress.
############################################
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# RUN PARAMETERS
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############################################
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abort=0
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auto_throttle=1
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firstfit=0
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bitcnt=8
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bloom=1
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bloom_bit_count=7
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bloom_hash_count=14
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bloom_oldest=0
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cache=2
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checkpoints=1
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checksum=uncompressed
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chunk_size=3
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compaction=0
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compression=bzip-raw
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data_extend=0
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data_source=table
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delete_pct=28
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dictionary=0
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evict_max=2
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file_type=row-store
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backups=0
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huffman_key=0
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huffman_value=0
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insert_pct=3
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internal_key_truncation=1
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internal_page_max=16
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isolation=snapshot
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key_gap=3
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key_max=72
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key_min=28
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leak_memory=0
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leaf_page_max=13
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logging=0
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logging_archive=0
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logging_prealloc=0
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lsm_worker_threads=4
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merge_max=20
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mmap=1
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ops=100000
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prefix_compression=1
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prefix_compression_min=6
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repeat_data_pct=3
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reverse=0
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rows=100000
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runs=100
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split_pct=67
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statistics=1
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statistics_server=0
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threads=16
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timer=20
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value_max=3805
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value_min=16
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wiredtiger_config=
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write_pct=59
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############################################
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