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ASF GitHub Bot logged work on HDFS-16521: ----------------------------------------- Author: ASF GitHub Bot Created on: 25/Apr/22 16:44 Start Date: 25/Apr/22 16:44 Worklog Time Spent: 10m Work Description: hadoop-yetus commented on PR #4107: URL: https://github.com/apache/hadoop/pull/4107#issuecomment-1108803632 :broken_heart: **-1 overall** | Vote | Subsystem | Runtime | Logfile | Comment | |:----:|----------:|--------:|:--------:|:-------:| | +0 :ok: | reexec | 0m 57s | | Docker mode activated. | |||| _ Prechecks _ | | +1 :green_heart: | dupname | 0m 1s | | No case conflicting files found. | | +0 :ok: | codespell | 0m 0s | | codespell was not available. | | +0 :ok: | buf | 0m 0s | | buf was not available. | | +1 :green_heart: | @author | 0m 0s | | The patch does not contain any @author tags. | | +1 :green_heart: | test4tests | 0m 0s | | The patch appears to include 3 new or modified test files. | |||| _ trunk Compile Tests _ | | +0 :ok: | mvndep | 15m 51s | | Maven dependency ordering for branch | | +1 :green_heart: | mvninstall | 28m 17s | | trunk passed | | +1 :green_heart: | compile | 7m 16s | | trunk passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 | | +1 :green_heart: | compile | 6m 52s | | trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 | | +1 :green_heart: | checkstyle | 1m 36s | | trunk passed | | +1 :green_heart: | mvnsite | 3m 50s | | trunk passed | | +1 :green_heart: | javadoc | 3m 9s | | trunk passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 | | +1 :green_heart: | javadoc | 3m 39s | | trunk passed with JDK Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 | | +1 :green_heart: | spotbugs | 8m 17s | | trunk passed | | +1 :green_heart: | shadedclient | 24m 14s | | branch has no errors when building and testing our client artifacts. | |||| _ Patch Compile Tests _ | | +0 :ok: | mvndep | 0m 25s | | Maven dependency ordering for patch | | +1 :green_heart: | mvninstall | 2m 58s | | the patch passed | | +1 :green_heart: | compile | 6m 43s | | the patch passed with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 | | +1 :green_heart: | cc | 6m 43s | | the patch passed | | -1 :x: | javac | 6m 43s | [/results-compile-javac-hadoop-hdfs-project-jdkUbuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4107/6/artifact/out/results-compile-javac-hadoop-hdfs-project-jdkUbuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04.txt) | hadoop-hdfs-project-jdkUbuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 with JDK Ubuntu-11.0.14.1+1-Ubuntu-0ubuntu1.20.04 generated 1 new + 651 unchanged - 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Issue Time Tracking ------------------- Worklog Id: (was: 761902) Time Spent: 3h 20m (was: 3h 10m) > DFS API to retrieve slow datanodes > ---------------------------------- > > Key: HDFS-16521 > URL: https://issues.apache.org/jira/browse/HDFS-16521 > Project: Hadoop HDFS > Issue Type: New Feature > Reporter: Viraj Jasani > Assignee: Viraj Jasani > Priority: Major > Labels: pull-request-available > Time Spent: 3h 20m > Remaining Estimate: 0h > > Providing DFS API to retrieve slow nodes would help add an additional option > to "dfsadmin -report" that lists slow datanodes info for operators to take a > look, specifically useful filter for larger clusters. > The other purpose of such API is for HDFS downstreamers without direct access > to namenode http port (only rpc port accessible) to retrieve slownodes. > Moreover, > [FanOutOneBlockAsyncDFSOutput|https://github.com/apache/hbase/blob/master/hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/FanOutOneBlockAsyncDFSOutput.java] > in HBase currently has to rely on it's own way of marking and excluding slow > nodes while 1) creating pipelines and 2) handling ack, based on factors like > the data length of the packet, processing time with last ack timestamp, > whether flush to replicas is finished etc. If it can utilize slownode API > from HDFS to exclude nodes appropriately while writing block, a lot of it's > own post-ack computation of slow nodes can be _saved_ or _improved_ or based > on further experiment, we could find _better solution_ to manage slow node > detection logic both in HDFS and HBase. However, in order to collect more > data points and run more POC around this area, HDFS should provide API for > downstreamers to efficiently utilize slownode info for such critical > low-latency use-case (like writing WALs). -- 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