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https://issues.apache.org/jira/browse/IMPALA-13783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-13783.
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Fix Version/s: Impala 4.6.0
Resolution: Fixed
Resolving this. Thank [~csringhofer] and [~MikaelSmith] for the review!
> Catalog update thread might hold a large memory in
> addHdfsPartitionsToCatalogDelta
> ----------------------------------------------------------------------------------
>
> Key: IMPALA-13783
> URL: https://issues.apache.org/jira/browse/IMPALA-13783
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Affects Versions: Impala 4.0.0, Impala 4.1.0, Impala 4.2.0, Impala 4.1.1,
> Impala 4.1.2, Impala 4.3.0, Impala 4.4.0, Impala 4.4.1
> Reporter: Quanlong Huang
> Assignee: Quanlong Huang
> Priority: Critical
> Fix For: Impala 4.6.0
>
> Attachments: HdfsTable.png, THdfsPartition.png,
> catalog-update-thread.png, stacktrace.png
>
>
> In addHdfsPartitionsToCatalogDelta(), there is a loop of collecting updates
> on new partitions:
> {code:java}
> long maxSentId = hdfsTable.getMaxSentPartitionId();
> for (TCatalogObject catalogPart :
> hdfsTable.getNewPartitionsSinceLastUpdate()) {
> maxSentId = Math.max(maxSentId,
> catalogPart.getHdfs_partition().getId());
> ctx.addCatalogObject(catalogPart, false, updateSummary);
> }
> hdfsTable.setMaxSentPartitionId(maxSentId);
> {code}
> [https://github.com/apache/impala/blob/83452d640fd27410befaf31346eda15febf624f0/fe/src/main/java/org/apache/impala/catalog/CatalogServiceCatalog.java#L1794]
> hdfsTable.getNewPartitionsSinceLastUpdate() returns a temp list of the
> THdfsPartition objects which contain the file descriptors (THdfsFileDesc) and
> hms parameters. These won't be used in local catalog mode. However, they
> could hold a large memory footprint for a table with lots of partitions.
> I test a table with 6M partitions and 6M files (one file per partition), the
> HdfsTable object itself takes 7.3GB in memory. However, this temp list takes
> 8.9GB when catalogd collects updates of the table after it's just loaded (so
> all partitions are new).
> !catalog-update-thread.png|width=419,height=244!!HdfsTable.png|height=244!
> Array of the TCatalogObject that contains the THdfsPartitions (address is
> 0x60ebb1b70):
> !THdfsPartition.png|width=654,height=261!
> Stacktrace of the catalog-update thread:
> !stacktrace.png|width=1052,height=424!
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