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Hadoop QA commented on HDFS-14084: ---------------------------------- | (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 9s{color} | {color:red} HDFS-14084 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-14084 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12956501/HDFS-14084.015.patch | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/26065/console | | Powered by | Apache Yetus 0.8.0 http://yetus.apache.org | This message was automatically generated. > Need for more stats in DFSClient > -------------------------------- > > Key: HDFS-14084 > URL: https://issues.apache.org/jira/browse/HDFS-14084 > Project: Hadoop HDFS > Issue Type: Improvement > Affects Versions: 3.0.0 > Reporter: Pranay Singh > Assignee: Pranay Singh > Priority: Minor > Fix For: 3.3.0 > > Attachments: HDFS-14084.001.patch, HDFS-14084.002.patch, > HDFS-14084.003.patch, HDFS-14084.004.patch, HDFS-14084.005.patch, > HDFS-14084.006.patch, HDFS-14084.007.patch, HDFS-14084.008.patch, > HDFS-14084.009.patch, HDFS-14084.010.patch, HDFS-14084.011.patch, > HDFS-14084.012.patch, HDFS-14084.013.patch, HDFS-14084.014.patch, > HDFS-14084.015.patch > > > The usage of HDFS has changed from being used as a map-reduce filesystem, now > it's becoming more of like a general purpose filesystem. In most of the cases > there are issues with the Namenode so we have metrics to know the workload or > stress on Namenode. > However, there is a need to have more statistics collected for different > operations/RPCs in DFSClient to know which RPC operations are taking longer > time or to know what is the frequency of the operation.These statistics can > be exposed to the users of DFS Client and they can periodically log or do > some sort of flow control if the response is slow. This will also help to > isolate HDFS issue in a mixed environment where on a node say we have Spark, > HBase and Impala running together. We can check the throughput of different > operation across client and isolate the problem caused because of noisy > neighbor or network congestion or shared JVM. > We have dealt with several problems from the field for which there is no > conclusive evidence as to what caused the problem. If we had metrics or stats > in DFSClient we would be better equipped to solve such complex problems. > List of jiras for reference: > ------------------------- > HADOOP-15538 HADOOP-15530 ( client side deadlock) -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org