[SPARK-4386] Improve performance when writing Parquet files #3843
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Convert type of RowWriteSupport.attributes to Array. Analysis of performance for writing very wide tables shows that time is spent predominantly in apply method on attributes var. Type of attributes previously was LinearSeqOptimized and apply is O(N) which made write O(N squared). Measurements on 575 column table showed this change showed a 6x improvement in write times.
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Can one of the admins verify this patch? |
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ok to test |
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Test build #24902 has started for PR 3843 at commit
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Test build #24902 has finished for PR 3843 at commit
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Test PASSed. |
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Thanks! I'm merging this to master and branch-1.2. |
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Convert type of RowWriteSupport.attributes to Array. Analysis of performance for writing very wide tables shows that time is spent predominantly in apply method on attributes var. Type of attributes previously was LinearSeqOptimized and apply is O(N) which made write O(N squared). Measurements on 575 column table showed this change made a 6x improvement in write times. Author: Michael Davies <Michael.BellDavies@gmail.com> Closes #3843 from MickDavies/SPARK-4386 and squashes the following commits: 892519d [Michael Davies] [SPARK-4386] Improve performance when writing Parquet files (cherry picked from commit 7425bec) Signed-off-by: Michael Armbrust <michael@databricks.com>
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Convert type of RowWriteSupport.attributes to Array.
Analysis of performance for writing very wide tables shows that time is spent predominantly in apply method on attributes var. Type of attributes previously was LinearSeqOptimized and apply is O(N) which made write O(N squared).
Measurements on 575 column table showed this change made a 6x improvement in write times.