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ASF GitHub Bot logged work on HDFS-15987: ----------------------------------------- Author: ASF GitHub Bot Created on: 18/Mar/22 15:02 Start Date: 18/Mar/22 15:02 Worklog Time Spent: 10m Work Description: Hexiaoqiao commented on pull request #2918: URL: https://github.com/apache/hadoop/pull/2918#issuecomment-1070851373 Thanks @whbing for your updates. It almost look good to me. Please fix checkstyle issue also. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 744062) Time Spent: 6h 10m (was: 6h) > Improve oiv tool to parse fsimage file in parallel with delimited format > ------------------------------------------------------------------------ > > Key: HDFS-15987 > URL: https://issues.apache.org/jira/browse/HDFS-15987 > Project: Hadoop HDFS > Issue Type: Sub-task > Reporter: Hongbing Wang > Assignee: Hongbing Wang > Priority: Major > Labels: pull-request-available > Attachments: Improve_oiv_tool_001.pdf > > Time Spent: 6h 10m > Remaining Estimate: 0h > > The purpose of this Jira is to improve oiv tool to parse fsimage file with > sub-sections (see -HDFS-14617-) in parallel with delmited format. > 1.Serial parsing is time-consuming > The time to serially parse a large fsimage with delimited format (e.g. `hdfs > oiv -p Delimited -t <tmp> ...`) is as follows: > {code:java} > 1) Loading string table: -> Not time consuming. > 2) Loading inode references: -> Not time consuming > 3) Loading directories in INode section: -> Slightly time consuming (3%) > 4) Loading INode directory section: -> A bit time consuming (11%) > 5) Output: -> Very time consuming (86%){code} > Therefore, output is the most parallelized stage. > 2.How to output in parallel > The sub-sections are grouped in order, and each thread processes a group and > outputs it to the file corresponding to each thread, and finally merges the > output files. > 3. The result of a test > {code:java} > input fsimage file info: > 3.4G, 12 sub-sections, 55976500 INodes > ----------------------------------------- > Threads TotalTime OutputTime MergeTime > 1 18m37s 16m18s – > 4 8m7s 4m49s 41s{code} > > > -- This message was sent by Atlassian Jira (v8.20.1#820001) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org