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https://issues.apache.org/jira/browse/HIVE-24663?focusedWorklogId=600161&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-600161
]
ASF GitHub Bot logged work on HIVE-24663:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/May/21 03:39
Start Date: 21/May/21 03:39
Worklog Time Spent: 10m
Work Description: maheshk114 commented on a change in pull request #2266:
URL: https://github.com/apache/hive/pull/2266#discussion_r636613441
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java
##########
@@ -8994,10 +9028,15 @@ public boolean
set_aggr_stats_for(SetPartitionsStatsRequest request) throws TExc
colNames, newStatsMap, request);
} else { // No merge.
Table t = getTable(catName, dbName, tableName);
- for (Map.Entry<String, ColumnStatistics> entry :
newStatsMap.entrySet()) {
- // We don't short-circuit on errors here anymore. That can leave
acid stats invalid.
- ret = updatePartitonColStatsInternal(t, entry.getValue(),
- request.getValidWriteIdList(), request.getWriteId()) && ret;
+ // We don't short-circuit on errors here anymore. That can leave acid
stats invalid.
+ if (newStatsMap.size() > 1) {
+ LOG.info("ETL_PERF started updatePartitionColStatsInBatch");
+ ret = updatePartitionColStatsInBatch(t, newStatsMap,
+ request.getValidWriteIdList(), request.getWriteId());
+ LOG.info("ETL_PERF done updatePartitionColStatsInBatch");
+ } else {
+ ret = updatePartitonColStatsInternal(t,
newStatsMap.values().iterator().next(),
Review comment:
The batching is a specific condition, when the partitions are from same
table. I am not sure if in other flows this holds good. So i have used the
batching only in the flow where this is guaranteed.
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Issue Time Tracking
-------------------
Worklog Id: (was: 600161)
Time Spent: 50m (was: 40m)
> Batch process in ColStatsProcessor for partitions.
> --------------------------------------------------
>
> Key: HIVE-24663
> URL: https://issues.apache.org/jira/browse/HIVE-24663
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: mahesh kumar behera
> Priority: Major
> Labels: performance, pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> When large number of partitions (>20K) are processed, ColStatsProcessor runs
> into DB issues.
> {{ db.setPartitionColumnStatistics(request);}} gets stuck for hours together
> and in some cases postgres stops processing.
> It would be good to introduce small batches for stats gathering in
> ColStatsProcessor instead of bulk update.
> Ref:
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/stats/ColStatsProcessor.java#L181
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/stats/ColStatsProcessor.java#L199
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