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ASF GitHub Bot logged work on HDFS-16520: ----------------------------------------- Author: ASF GitHub Bot Created on: 22/Apr/22 07:30 Start Date: 22/Apr/22 07:30 Worklog Time Spent: 10m Work Description: cndaimin commented on PR #4104: URL: https://github.com/apache/hadoop/pull/4104#issuecomment-1106106812 @tasanuma Thanks for your review. Issue Time Tracking ------------------- Worklog Id: (was: 760665) Time Spent: 2h 10m (was: 2h) > Improve EC pread: avoid potential reading whole block > ----------------------------------------------------- > > Key: HDFS-16520 > URL: https://issues.apache.org/jira/browse/HDFS-16520 > Project: Hadoop HDFS > Issue Type: Improvement > Components: dfsclient, ec > Affects Versions: 3.3.1, 3.3.2 > Reporter: daimin > Assignee: daimin > Priority: Major > Labels: pull-request-available > Time Spent: 2h 10m > Remaining Estimate: 0h > > HDFS client 'pread' represents 'position read', this kind of read just need a > range of data instead of reading the whole file/block. By using > BlockReaderFactory#setLength, client tells datanode the block length to be > read from disk and sent to client. > To EC file, the block length to read is not well set, by default using > 'block.getBlockSize() - offsetInBlock' to both pread and sread. Thus datanode > read much more data and send to client, and abort when client closes > connection. There is a lot waste of resource to this situation. -- This message was sent by Atlassian Jira (v8.20.7#820007) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org