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https://issues.apache.org/jira/browse/HDFS-16967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17708122#comment-17708122
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ASF GitHub Bot commented on HDFS-16967:
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simbadzina commented on code in PR #5523:
URL: https://github.com/apache/hadoop/pull/5523#discussion_r1156454774
##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/driver/impl/StateStoreFileBaseImpl.java:
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@@ -227,7 +270,23 @@ public <T extends BaseRecord> QueryResult<T> get(Class<T>
clazz)
if (metrics != null) {
metrics.addRead(monotonicNow() - start);
}
- return new QueryResult<T>(ret, getTime());
+ return new QueryResult<>(result, getTime());
+ }
+
+ private <T extends BaseRecord> Void
getRecordsFromFileAndRemoveOldTmpRecords(Class<T> clazz,
Review Comment:
Looks good.
> RBF: File based state stores should allow concurrent access to the records
> --------------------------------------------------------------------------
>
> Key: HDFS-16967
> URL: https://issues.apache.org/jira/browse/HDFS-16967
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
>
> File based state store implementations (StateStoreFileImpl and
> StateStoreFileSystemImpl) should allow updating as well as reading of the
> state store records concurrently rather than serially. Concurrent access to
> the record files on the hdfs based store seems to be improving the state
> store cache loading performance by more than 10x.
> For instance, in order to maintain data integrity, when any mount table
> record(s) is updated, the cache is reloaded. This reload operation seems to
> be able to gain significant performance improvement by the concurrent access
> of the mount table records.
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