[SPARK-9709] [SQL] Avoid starving unsafe operators that use sort #8011
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August 6, 2015 12:05
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High level approach looks good. Would be great to simplify the test case to not rely on memory management. Just use an atomicinteger somewhere. |
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Test build #40091 has finished for PR 8011 at commit
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LGTM |
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retest this please |
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Test build #40093 timed out for PR 8011 at commit |
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Test build #40103 has finished for PR 8011 at commit
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The issue is that a task may run multiple sorts, and the sorts run by the child operator (i.e. parent RDD) may acquire all available memory such that other sorts in the same task do not have enough to proceed. This manifests itself in an `IOException("Unable to acquire X bytes of memory")` thrown by `UnsafeExternalSorter`.
The solution is to reserve a page in each sorter in the chain before computing the child operator's (parent RDD's) partitions. This requires us to use a new special RDD that does some preparation before computing the parent's partitions.
Author: Andrew Or <[email protected]>
Closes #8011 from andrewor14/unsafe-starve-memory and squashes the following commits:
35b69a4 [Andrew Or] Simplify test
0b07782 [Andrew Or] Minor: update comments
5d5afdf [Andrew Or] Merge branch 'master' of github.com:apache/spark into unsafe-starve-memory
254032e [Andrew Or] Add tests
234acbd [Andrew Or] Reserve a page in sorter when preparing each partition
b889e08 [Andrew Or] MapPartitionsWithPreparationRDD
(cherry picked from commit 014a9f9)
Signed-off-by: Reynold Xin <[email protected]>
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Test build #40107 has finished for PR 8011 at commit
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This is the sister patch to #8011, but for aggregation. In a nutshell: create the `TungstenAggregationIterator` before computing the parent partition. Internally this creates a `BytesToBytesMap` which acquires a page in the constructor as of this patch. This ensures that the aggregation operator is not starved since we reserve at least 1 page in advance. rxin yhuai Author: Andrew Or <[email protected]> Closes #8038 from andrewor14/unsafe-starve-memory-agg. (cherry picked from commit e011079) Signed-off-by: Reynold Xin <[email protected]>
asfgit
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This is the sister patch to #8011, but for aggregation. In a nutshell: create the `TungstenAggregationIterator` before computing the parent partition. Internally this creates a `BytesToBytesMap` which acquires a page in the constructor as of this patch. This ensures that the aggregation operator is not starved since we reserve at least 1 page in advance. rxin yhuai Author: Andrew Or <[email protected]> Closes #8038 from andrewor14/unsafe-starve-memory-agg.
CodingCat
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This is the sister patch to apache#8011, but for aggregation. In a nutshell: create the `TungstenAggregationIterator` before computing the parent partition. Internally this creates a `BytesToBytesMap` which acquires a page in the constructor as of this patch. This ensures that the aggregation operator is not starved since we reserve at least 1 page in advance. rxin yhuai Author: Andrew Or <[email protected]> Closes apache#8038 from andrewor14/unsafe-starve-memory-agg.
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The issue is that a task may run multiple sorts, and the sorts run by the child operator (i.e. parent RDD) may acquire all available memory such that other sorts in the same task do not have enough to proceed. This manifests itself in an
IOException("Unable to acquire X bytes of memory")thrown byUnsafeExternalSorter.The solution is to reserve a page in each sorter in the chain before computing the child operator's (parent RDD's) partitions. This requires us to use a new special RDD that does some preparation before computing the parent's partitions.