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https://issues.apache.org/jira/browse/TEZ-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated TEZ-3680:
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Attachment: TEZ-3680.1.patch
Changes are for counter updating and for increasing number of threads in
threadpool.
Merging all partitions at the time of close() is very expensive currently
depending on the number of partitions and spills (e.g for 20 spills with 1009
partitions, it ends up reopening the file lots of times). Haven't considered
optimizing this.
> Optimizations to UnorderedPartitionedKVWriter
> ---------------------------------------------
>
> Key: TEZ-3680
> URL: https://issues.apache.org/jira/browse/TEZ-3680
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Attachments: profiler.png, TEZ-3680.1.patch
>
>
> 1. Consider increasing the number of threads in spill executor.
> {{TEZ_RUNTIME_UNORDERED_OUTPUT_MAX_PER_BUFFER_SIZE_BYTES}} can be used to
> configure the buffer size. If smaller buffer sizes are provided, there is a
> chance of getting frequent spills; currently the spill executor operates in
> single threaded mode.
> 2. During profiling, things like incrementing the counters, notifying
> progress came up. This may not be common in regular tez jobs. But in
> processes like LLAP (hive based), it is possible to get into such situations.
> I will attach the profiler snapshot showing this. It would be good to
> update/notify less frequently.
> 3. Optimize mergeAll().
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