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https://issues.apache.org/jira/browse/HIVE-25192?focusedWorklogId=628173&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-628173
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ASF GitHub Bot logged work on HIVE-25192:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Jul/21 06:04
Start Date: 27/Jul/21 06:04
Worklog Time Spent: 10m
Work Description: dengzhhu653 commented on a change in pull request #2473:
URL: https://github.com/apache/hive/pull/2473#discussion_r677143487
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java
##########
@@ -2572,18 +2569,24 @@ public static ContentSummary getInputSummary(final
Context ctx, MapWork work, Pa
int numExecutors = getMaxExecutorsForInputListing(ctx.getConf(),
pathNeedProcess.size());
if (numExecutors > 1) {
Review comment:
The problem is that the static global block `INPUT_SUMMARY_LOCK` will
block other threads that calling this method. The `INPUT_SUMMARY_LOCK` is
used for avoiding number of threads out of control, but this method does not
use thread pool to get the summaries by default, so the lock can be converted
to a finer-grained lock, which only takes care of the creation and execution of
the thread pool.
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java
##########
@@ -2680,9 +2683,9 @@ public void run() {
total += estimator.estimate(jobConf, scanOp,
-1).getTotalLength();
}
recordSummary(path, new ContentSummary(total, -1, -1));
- } else {
- // todo: should nullify summary for non-native tables,
- // not to be selected as a mapjoin target
+ } else if (handler == null) {
Review comment:
Thank you @pvary. The pr originally is trying to solve the non-native
table that participates in `join`, such table will be created with a path, but
have no data under it, so the non-native table may be selected as a mapjoin
target, which should cause oom problem when building the hashtable. The changes
take place in one file, so I put them together.
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Issue Time Tracking
-------------------
Worklog Id: (was: 628173)
Time Spent: 1h 50m (was: 1h 40m)
> Nullify summary for non-native tables
> -------------------------------------
>
> Key: HIVE-25192
> URL: https://issues.apache.org/jira/browse/HIVE-25192
> Project: Hive
> Issue Type: Bug
> Reporter: Zhihua Deng
> Assignee: Zhihua Deng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> When creating non-native tables like kudu, hbase and so on, we create a
> warehouse location for these tables, though these tables may not use the
> location to store data or for job plan, we should skip getting the input
> summary of non-native tables when optimising joins, as which may cause oom
> problem when the non-native table is on the build side.
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