[
https://issues.apache.org/jira/browse/HDFS-8864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee reassigned HDFS-8864:
--------------------------------
Assignee: Kihwal Lee
> Padding is needed in remaining space check
> ------------------------------------------
>
> Key: HDFS-8864
> URL: https://issues.apache.org/jira/browse/HDFS-8864
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Critical
>
> The RBW reservation feature removed the padding of 5 block worth of space in
> the remaining space check. But when disks are close to being full, a small
> accounting errors can make block creations to fail on the datanode. One
> obvious source of such error is the slow control loop formed by heartbeats.
> We have been testing a patch which adjusts the padding based on the heartbeat
> interval and it seems to be working fine. At the default 3 second heartbeat
> interval, the padding becomes 6 blocks, which is close to the previous value
> of 5. If a longer heartbeat interval is used, this will increase.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
