[jira] [Updated] (HDFS-6764) DN heartbeats may become clumped together
[ https://issues.apache.org/jira/browse/HDFS-6764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Junping Du updated HDFS-6764: - Target Version/s: (was: 2.8.0) > DN heartbeats may become clumped together > - > > Key: HDFS-6764 > URL: https://issues.apache.org/jira/browse/HDFS-6764 > Project: Hadoop HDFS > Issue Type: Bug > Components: datanode >Reporter: Daryn Sharp > Attachments: Screen Shot 2014-07-28 at 11.12.06 AM.png > > > DNs send heartbeats on a fixed schedule based on the last time a heartbeat > was sent. If the NN takes longer to respond than the heartbeat interval then > DNs do not sleep until the next interval. Instead, another heartbeat is > immediately sent and all DNs begin heartbeating on the same schedule. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Updated] (HDFS-6764) DN heartbeats may become clumped together
[ https://issues.apache.org/jira/browse/HDFS-6764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Daryn Sharp updated HDFS-6764: -- Attachment: Screen Shot 2014-07-28 at 11.12.06 AM.png Darker colors are the raw data of heartbeats per 0.5s. The lighter lines are a rolling 1s average which makes the rhythmic behavior of the active (light blue) easier to see. DN heartbeats may become clumped together - Key: HDFS-6764 URL: https://issues.apache.org/jira/browse/HDFS-6764 Project: Hadoop HDFS Issue Type: Bug Components: datanode Reporter: Daryn Sharp Attachments: Screen Shot 2014-07-28 at 11.12.06 AM.png DNs send heartbeats on a fixed schedule based on the last time a heartbeat was sent. If the NN takes longer to respond than the heartbeat interval then DNs do not sleep until the next interval. Instead, another heartbeat is immediately sent and all DNs begin heartbeating on the same schedule. -- This message was sent by Atlassian JIRA (v6.2#6252)
