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https://issues.apache.org/jira/browse/HUDI-8934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Bukhner updated HUDI-8934:
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Description: See https://github.com/apache/hudi/pull/12729 (was: Inspired
by RFC-84 HUDI-8920: there is an opinion Avro is not the best choice for Hudi.
It requires an extra ser/de operations not only between Flink operators (will
be fixed by RFC-84).
I decided to benchmark a POC version with native Flink's RowData writer for
Hudi. It was simple enough, because Hudi already has native RowData to Parquet
writer used by append mode, I reused this writer to create log blocks and two
bottlenecks were found:
1. Hudi performs *a lot of Avro ser/de operations* in writer runtime.
2. Hudi stores Avro recrods as List<HoodieRecord>, it causes a *GC pressure* on
writer runtime, on my benchmarks garbage collection is about 30% of all hudi
writer runtime.
!profiler.png|width=876,height=454!
h3. Results:
As a result I reduced write time from ~4min to ~1min 20sec ({*}x3 write
performance boost{*}):
!results.png|width=869,height=201!
I have a POC version we are already testing in our cloud environment, key
improvements:
# This POC based on RFC-84 and already contains POC from RFC-84
# Write native RowData to parquet log blocks (eliminate unnecessary ser/de)
# Recrods are stored in BinaryInMemorySortBuffer (reduce GC pressure)
# Records are sorted by new QuickSort().sort(sortBuffer) before writing log
block (maybe it's possible to preform data compaction without sorting? this
sort performs fast enough so it doesn't affect write performance.)
# RowDataStreamWriteFunction flushes bucket async (reduces previous operators
backpressure)
h3. My config:
PC: 32CPU 128GiB
Data: 60 million records of TPC-H lineitem table
Java: 17 openjdk
Flink: 1.20, Single JM + Sinlge TM, standalone, taskmanager.process.size: 8G
Write: Hadoop HDFS 3.3.1, 9 node cluster
Read: Kafka 2.8, 3 node cluster, 8 partitions
Hudi table:
'connector' = 'hudi',
'path' = '<hdfs_path>',
'table.type' = 'MERGE_ON_READ',
'metadata.enabled' = 'false',
'index.type'='BUCKET',
'hoodie.bucket.index.hash.field'='l_orderkey,l_linenumber',
'hoodie.bucket.index.num.buckets'='8',
'hoodie.parquet.compression.codec' = 'snappy',
*'hoodie.logfile.data.block.format' = 'parquet',*
*'hoodie.enable.fast.sort.write' = 'true',*
'write.operation' = 'upsert',
'write.batch.size'='256',
'write.tasks'='8',
'compaction.async.enabled' = 'false',
'clean.async.enabled' = 'false',
'hoodie.archive.automatic' = 'false',
'hoodie.clean.automatic' = 'false')
> [RFC-87] Avro elimination for Flink writer
> ------------------------------------------
>
> Key: HUDI-8934
> URL: https://issues.apache.org/jira/browse/HUDI-8934
> Project: Apache Hudi
> Issue Type: New Feature
> Components: flink, performance
> Reporter: Mark Bukhner
> Assignee: Mark Bukhner
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.1.0
>
> Attachments: profiler.png, results.png
>
>
> See https://github.com/apache/hudi/pull/12729
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