Details
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Improvement
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Status: Closed
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Major - P3
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Resolution: Fixed
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None
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None
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Storage 2017-03-27, Storage 2017-04-17
Description
Especially for workloads with updates that grow records. For example I ran a wtperf workload with the following configuration (requires changes for WT-2366):
conn_config="cache_size=2GB,checkpoint=(wait=60)"
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table_config="type=file,leaf_page_max=32k,leaf_value_max=128k,split_pct=90"
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# The values are starting small, insert a lot so our database grows larger than
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# cache quickly.
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icount=20000000
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report_interval=5
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run_time=3000
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populate_threads=1
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# Continue inserting new records.
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threads=((count=1,inserts=1,throttle=1000),(count=4,update=1,update_delta=100))
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# Start with small values and let them grow slowly to large values.
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value_sz=20
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value_sz_max=65536
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After the test has run for half an hour the database ends up with an unbalanced distribution of record counts per leaf page (picture to follow).