Kihwal Lee created HDFS-6599: -------------------------------- Summary: 2.4 addBlock is 10 to 20 times slower compared to 0.23 Key: HDFS-6599 URL: https://issues.apache.org/jira/browse/HDFS-6599 Project: Hadoop HDFS Issue Type: Bug Affects Versions: 2.4.0 Reporter: Kihwal Lee Priority: Critical
>From one of our busiest 0.23 clusters: {panel} "AddBlockAvgTime" : 0.9514711501719515 "CreateAvgTime" : 1.7564162389174 "CompleteAvgTime" : 1.3310406035056548 "BlockReceivedAndDeletedAvgTime" : 0.661210005151392 {panel} >From a not-so-busy 2.4 cluster: {panel} "AddBlockAvgTime" : 10.083333333333334 "CreateAvgTime" : 1.0 "CompleteAvgTime" : 1.1111111111111112 "BlockReceivedAndDeletedAvgTime" : 0.07692307692307694 {panel} When the 2.4 cluster gets a moderate amount of write requests, the latency is terrible. E.g. addBlock goes upward of 60ms. -- This message was sent by Atlassian JIRA (v6.2#6252)