Kihwal Lee created HDFS-6599:
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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.
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