Ted Yu created HDFS-7495:
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Summary: Lock inversion in DFSInputStream#getBlockAt()
Key: HDFS-7495
URL: https://issues.apache.org/jira/browse/HDFS-7495
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Ted Yu
Priority: Minor
There're two locks: one on DFSInputStream.this , one on DFSInputStream.infoLock
Normally lock is obtained on infoLock, then on DFSInputStream.infoLock
However, such order is not observed in DFSInputStream#getBlockAt() :
{code}
synchronized(infoLock) {
...
if (updatePosition) {
// synchronized not strictly needed, since we only get here
// from synchronized caller methods
synchronized(this) {
{code}
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