Github user parthchandra commented on the pull request:
https://github.com/apache/drill/pull/254#issuecomment-156589078
The last perf run was on 400K parquet files in a 2-layer directory
hierarchy:
root_dir/
2015-10-01/
d_01/
.
.
.
2015-10-31/
d_25/
That gave us 31x25 directories with 511 parquet files in each dir.
The numbers are with a warm file system cache.
Build Explain Plan Refresh metadata
Metadata size
MASTER (e275dc5) 145.854 s 225.083 s
2.9GB
with DRILL-4053 35.430 s 202.133 s
1.3GB
The Explain Plan query - "explain plan for select * from root_dir"
Refresh metadata query - "refresh table metadata dfs.root_dir "
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