Yiqun Lin created HDFS-13359:
--------------------------------
Summary: DataXceiver hungs due to the lock in
FsDatasetImpl#getBlockInputStream
Key: HDFS-13359
URL: https://issues.apache.org/jira/browse/HDFS-13359
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode
Affects Versions: 3.0.0
Reporter: Yiqun Lin
Assignee: Yiqun Lin
DataXceiver hungs due to the lock that locked by
{{FsDatasetImpl#getBlockInputStream}}.
{code}
@Override // FsDatasetSpi
public InputStream getBlockInputStream(ExtendedBlock b,
long seekOffset) throws IOException {
ReplicaInfo info;
synchronized(this) {
info = volumeMap.get(b.getBlockPoolId(), b.getLocalBlock());
}
...
}
{code}
The lock {{synchronized(this)}} used here is expensive, there is already one
{{AutoCloseableLock}} type lock defined for {{ReplicaMap}}. We can use it
instead.
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