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Hadoop QA commented on HDFS-13616: ---------------------------------- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s{color} | {color:blue} Docker mode activated. {color} | | {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 12s{color} | {color:red} HDFS-13616 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} | \\ \\ || Subsystem || Report/Notes || | JIRA Issue | HDFS-13616 | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/28477/console | | Powered by | Apache Yetus 0.8.0 http://yetus.apache.org | This message was automatically generated. > Batch listing of multiple directories > ------------------------------------- > > Key: HDFS-13616 > URL: https://issues.apache.org/jira/browse/HDFS-13616 > Project: Hadoop HDFS > Issue Type: New Feature > Affects Versions: 3.2.0 > Reporter: Andrew Wang > Assignee: Chao Sun > Priority: Major > Attachments: BenchmarkListFiles.java, HDFS-13616.001.patch, > HDFS-13616.002.patch > > > One of the dominant workloads for external metadata services is listing of > partition directories. This canĀ end up being bottlenecked on RTT time when > partition directories contain a small number of files. This is fairly common, > since fine-grained partitioning is used for partition pruning by the query > engines. > A batched listing API that takes multiple paths amortizes the RTT cost. > Initial benchmarks show a 10-20x improvement in metadata loading performance. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org