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https://issues.apache.org/jira/browse/TEZ-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Panagiotis Garefalakis updated TEZ-4183:
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Description:
Time based batching can put lot of pressure in AM's memory as the failedEvents
hashmap can grow fast
https://github.com/apache/tez/blob/354c2a4177fe8c3cf6b8a4c6009d4068a19d81f1/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/shuffle/impl/ShuffleManager.java#L951
To reduce AM pressure we can: 1) Batch fetch failure events to be sent
periodically (every BATCH_WAIT) and 2) if we see disk errors more than a
Threshold send the message immediately to AM (instead of waiting)
was:
Fetcher currently sends failure events to AM as soon as they are discovered:
https://github.com/apache/tez/blob/354c2a4177fe8c3cf6b8a4c6009d4068a19d81f1/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/shuffle/impl/ShuffleManager.java#L930
To reduce AM pressure we can: 1) Batch fetch failure events to be sent
periodically (every BATCH_WAIT) and 2) if we see disk errors more than a
Threshold send the message immediately to AM (instead of waiting)
> Time- and threshold-batched FetchFailure event propagation to AM
> ----------------------------------------------------------------
>
> Key: TEZ-4183
> URL: https://issues.apache.org/jira/browse/TEZ-4183
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Panagiotis Garefalakis
> Assignee: Panagiotis Garefalakis
> Priority: Major
> Attachments: TEZ-4183.01.patch, TEZ-4183.02.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Time based batching can put lot of pressure in AM's memory as the
> failedEvents hashmap can grow fast
> https://github.com/apache/tez/blob/354c2a4177fe8c3cf6b8a4c6009d4068a19d81f1/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/shuffle/impl/ShuffleManager.java#L951
> To reduce AM pressure we can: 1) Batch fetch failure events to be sent
> periodically (every BATCH_WAIT) and 2) if we see disk errors more than a
> Threshold send the message immediately to AM (instead of waiting)
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