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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/11/17 11:40:45 UTC
[GitHub] [iotdb] wshao08 opened a new pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
wshao08 opened a new pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063
A merge lock has already been added locking the whole Last query procedure, however, this procedure may take a long time.
This PR refactor the Last query execution process, separating it into multiple stages:
1. Get Last result by accessing cache.
2. Hold merge lock and obtain query resource.
3. Scan TsFiles to get Last value.
Now only the stage 2 will be locked.
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URL: https://github.com/apache/iotdb/pull/2063#issuecomment-728876334
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[GitHub] [iotdb] JackieTien97 merged pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
JackieTien97 merged pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063
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URL: https://github.com/apache/iotdb/pull/2063#issuecomment-729479199
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[GitHub] [iotdb] qiaojialin commented on a change in pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
qiaojialin commented on a change in pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#discussion_r525154948
##########
File path: server/src/main/java/org/apache/iotdb/db/query/executor/QueryRouter.java
##########
@@ -225,12 +225,8 @@ public QueryDataSet groupByFill(GroupByTimeFillPlan groupByFillPlan, QueryContex
@Override
public QueryDataSet lastQuery(LastQueryPlan lastQueryPlan, QueryContext context)
throws StorageEngineException, QueryProcessException, IOException {
- LastQueryExecutor lastQueryExecutor = getLastQueryExecutor(lastQueryPlan);
+ LastQueryExecutor lastQueryExecutor = new LastQueryExecutor(lastQueryPlan);
return lastQueryExecutor.execute(context, lastQueryPlan);
}
- protected LastQueryExecutor getLastQueryExecutor(LastQueryPlan lastQueryPlan) {
Review comment:
this may be used in cluster @jt2594838
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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2063#issuecomment-729488420
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#discussion_r525622957
##########
File path: server/src/main/java/org/apache/iotdb/db/metadata/MTree.java
##########
@@ -107,8 +109,12 @@ static long getLastTimeStamp(MeasurementMNode node, QueryContext queryContext) {
return node.getCachedLast().getTimestamp();
} else {
try {
- last = calculateLastPairForOneSeriesLocally(node.getPartialPath(),
- node.getSchema().getType(), queryContext, null, Collections.emptySet());
+ QueryDataSource dataSource = QueryResourceManager.getInstance().
+ getQueryDataSource(node.getPartialPath(), queryContext, null);
+ LastPointReader lastReader = new LastPointReader(node.getPartialPath(),
+ node.getSchema().getType(), Collections.emptySet(), queryContext,
Review comment:
it should be a Collections.single() instead of an emptySet()
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#issuecomment-729455835
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[GitHub] [iotdb] jt2594838 commented on a change in pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
jt2594838 commented on a change in pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#discussion_r525158766
##########
File path: server/src/main/java/org/apache/iotdb/db/query/executor/QueryRouter.java
##########
@@ -225,12 +225,8 @@ public QueryDataSet groupByFill(GroupByTimeFillPlan groupByFillPlan, QueryContex
@Override
public QueryDataSet lastQuery(LastQueryPlan lastQueryPlan, QueryContext context)
throws StorageEngineException, QueryProcessException, IOException {
- LastQueryExecutor lastQueryExecutor = getLastQueryExecutor(lastQueryPlan);
+ LastQueryExecutor lastQueryExecutor = new LastQueryExecutor(lastQueryPlan);
return lastQueryExecutor.execute(context, lastQueryPlan);
}
- protected LastQueryExecutor getLastQueryExecutor(LastQueryPlan lastQueryPlan) {
Review comment:
Yes, indeed. I hope you can make some interfaces out of it, which would better not be modified so frequently.
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[GitHub] [iotdb] qiaojialin commented on a change in pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
qiaojialin commented on a change in pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#discussion_r525154948
##########
File path: server/src/main/java/org/apache/iotdb/db/query/executor/QueryRouter.java
##########
@@ -225,12 +225,8 @@ public QueryDataSet groupByFill(GroupByTimeFillPlan groupByFillPlan, QueryContex
@Override
public QueryDataSet lastQuery(LastQueryPlan lastQueryPlan, QueryContext context)
throws StorageEngineException, QueryProcessException, IOException {
- LastQueryExecutor lastQueryExecutor = getLastQueryExecutor(lastQueryPlan);
+ LastQueryExecutor lastQueryExecutor = new LastQueryExecutor(lastQueryPlan);
return lastQueryExecutor.execute(context, lastQueryPlan);
}
- protected LastQueryExecutor getLastQueryExecutor(LastQueryPlan lastQueryPlan) {
Review comment:
this may be used in cluster
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2063#issuecomment-729334009
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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2063#issuecomment-728922706
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2063: Refactor LastQueryExecutor to separate the execution into multiple stages
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] removed a comment on pull request #2063:
URL: https://github.com/apache/iotdb/pull/2063#issuecomment-729455835
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