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wujinhu commented on HADOOP-15262: ---------------------------------- Attach HADOOP-15262.005.patch! Set a upper limit to waiting list size. With this patch resolved, users can improve copy performance by increase *fs.oss.max.copy.threads* and *fs.oss.max.copy.tasks.per.dir*(Old version copies directory in series). Generally*,* the greater of the *fs.oss.max.copy.threads* and ** *fs.oss.max.copy.tasks.per.dir***, the better(if we have enough resources) Here is one use case that drives us to have this improvement. Users use spark/tensorFlow/..... to train models and save models file to OSS. However, the number of the model files is large, so it will be slow when committing jobs because frameworks will call rename(). > AliyunOSS: rename() to move files in a directory in parallel > ------------------------------------------------------------ > > Key: HADOOP-15262 > URL: https://issues.apache.org/jira/browse/HADOOP-15262 > Project: Hadoop Common > Issue Type: Sub-task > Components: fs/oss > Affects Versions: 3.0.0 > Reporter: wujinhu > Assignee: wujinhu > Priority: Major > Fix For: 3.1.0, 2.9.1, 3.0.1 > > Attachments: HADOOP-15262.001.patch, HADOOP-15262.002.patch, > HADOOP-15262.003.patch, HADOOP-15262.004.patch, HADOOP-15262.005.patch > > > Currently, rename() operation renames files in series. This will be slow if a > directory contains many files. So we can improve this by rename files in > parallel. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org