He Xiaoqiao created HDFS-8993:
---------------------------------
Summary: Balancer throws NPE
Key: HDFS-8993
URL: https://issues.apache.org/jira/browse/HDFS-8993
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer & mover
Affects Versions: 2.4.1
Reporter: He Xiaoqiao
Balancer may throw NPE because the following {{if Statements}}
{code:java|firstline=705}
synchronized (block) {
// update locations
for (String datanodeUuid : blk.getDatanodeUuids()) {
final BalancerDatanode d = datanodeMap.get(datanodeUuid);
if (datanode != null) { // not an unknown datanode
block.addLocation(d);
}
}
}
{code}
Before moving block, Balancer divides into two step to get all DNs info & some blocks
of DN from NN. Regarding one DN commission after {{getDatanodeReport}} then {{getBlockList}}
and one block's target is above DN just right, It will throw NPE when dispatcher.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
|