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https://issues.apache.org/jira/browse/BEAM-9434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emiliano Capoccia updated BEAM-9434:
------------------------------------
Description:
There is a performance issue when processing a large number of small Avro files
in Spark on K8S (tens of thousands or more).
The recommended way of reading a pattern of Avro files in Beam is by means of:
{code:java}
PCollection<AvroGenClass> records = p.apply(AvroIO.read(AvroGenClass.class)
.from("s3://my-bucket/path-to/*.avro").withHintMatchesManyFiles())
{code}
However, in the case of many small files, the above results in the entire
reading taking place in a single task/node, which is considerably slow and has
scalability issues.
The option of omitting the hint is not viable, as it results in too many tasks
being spawn, and the cluster being busy doing coordination of tiny tasks with
high overhead.
There are a few workarounds on the internet which mainly revolve around
compacting the input files before processing, so that a reduced number of bulky
files is processed in parallel.
was:
There is a performance issue when processing in Spark on K8S a large number of
small Avro files (tens of thousands or more).
The recommended way of reading a pattern of Avro files in Beam is by means of:
{code:java}
PCollection<AvroGenClass> records = p.apply(AvroIO.read(AvroGenClass.class)
.from("s3://my-bucket/path-to/*.avro").withHintMatchesManyFiles())
{code}
However, in the case of many small files the above results in the entire
reading taking place in a single task/node, which is considerably slow and has
scalability issues.
The option of omitting the hint is not viable, as it results in too many tasks
being spawn and the cluster busy doing coordination of tiny tasks with high
overhead.
There are a few workarounds on the internet which mainly revolve around
compacting the input files before processing, so that a reduced number of bulky
files is processed in parallel.
> Performance improvements processing a large number of Avro files in S3+Spark
> ----------------------------------------------------------------------------
>
> Key: BEAM-9434
> URL: https://issues.apache.org/jira/browse/BEAM-9434
> Project: Beam
> Issue Type: Improvement
> Components: io-java-aws, sdk-java-core
> Affects Versions: 2.19.0
> Reporter: Emiliano Capoccia
> Assignee: Emiliano Capoccia
> Priority: Minor
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> There is a performance issue when processing a large number of small Avro
> files in Spark on K8S (tens of thousands or more).
> The recommended way of reading a pattern of Avro files in Beam is by means of:
>
> {code:java}
> PCollection<AvroGenClass> records = p.apply(AvroIO.read(AvroGenClass.class)
> .from("s3://my-bucket/path-to/*.avro").withHintMatchesManyFiles())
> {code}
> However, in the case of many small files, the above results in the entire
> reading taking place in a single task/node, which is considerably slow and
> has scalability issues.
> The option of omitting the hint is not viable, as it results in too many
> tasks being spawn, and the cluster being busy doing coordination of tiny
> tasks with high overhead.
> There are a few workarounds on the internet which mainly revolve around
> compacting the input files before processing, so that a reduced number of
> bulky files is processed in parallel.
>
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