Wei-Chiu Chuang created HDFS-14578:
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Summary: AvailableSpaceBlockPlacementPolicy always prefers local
node
Key: HDFS-14578
URL: https://issues.apache.org/jira/browse/HDFS-14578
Project: Hadoop HDFS
Issue Type: Bug
Components: block placement
Affects Versions: 3.0.0-alpha1, 2.7.4, 2.8.0
Reporter: Wei-Chiu Chuang
It looks like AvailableSpaceBlockPlacementPolicy prefers local disk just like
in the BlockPlacementPolicyDefault
As Yongjun mentioned in
[HDFS-8131|https://issues.apache.org/jira/browse/HDFS-8131?focusedCommentId=16558739&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16558739],
{quote}Class AvailableSpaceBlockPlacementPolicy extends
BlockPlacementPolicyDefault. But it doesn't change the behavior of choosing the
first node in BlockPlacementPolicyDefault, so even with this new feature, the
local DN is always chosen as the first DN (of course when it is not excluded),
and the new feature only changes the selection of the rest of the two DNs.
{quote}
I'm file this Jira as I groom Cloudera's internal Jira and found this
unreported issue. We do have a customer hitting this problem. I don't have a
fix, but thought it would be beneficial to report it to Apache Jira.
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