imay commented on a change in pull request #1154: Add logic of cancel job
URL: https://github.com/apache/incubator-doris/pull/1154#discussion_r283659159
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File path: fe/src/main/java/org/apache/doris/load/loadv2/LoadManager.java
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@@ -113,10 +114,11 @@ public void cancelLoadJob(CancelLoadStmt stmt) throws
DdlException {
if (!dbIdToLabelToLoadJobs.containsKey(db.getId())) {
throw new DdlException("Load job does not exist");
}
- if
(!dbIdToLabelToLoadJobs.get(db.getId()).containsKey(stmt.getLabel())) {
+ Map<String, List<LoadJob>> labelToLoadJobs =
dbIdToLabelToLoadJobs.get(db.getId());
+ if (!labelToLoadJobs.containsKey(stmt.getLabel())) {
throw new DdlException("Load job does not exist");
}
- List<LoadJob> loadJobList =
dbIdToLabelToLoadJobs.get(db.getId()).get(stmt.getLabel());
+ List<LoadJob> loadJobList = labelToLoadJobs.get(stmt.getLabel());
Review comment:
Hash the key is the first operation, `containsKey` will also check if two
keys are equal, because hash of two keys may equal. And these operation's cost
is less than a `get` operation.
Yes, in this case you add a readLock. But what I want to say is that it is
good habit to check get's value
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