Yuanbo Liu created HDFS-16433:
---------------------------------
Summary: The synchronized lock of IncrementalBlockReportManager
will slow down the speed of creating/deleting/finalizing block
Key: HDFS-16433
URL: https://issues.apache.org/jira/browse/HDFS-16433
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Yuanbo Liu
Attachments: image-2022-01-21-22-52-52-912.png
The code in IncrementalBlockReportManager.java
{code:java}
synchronized void waitTillNextIBR(long waitTime) {
if (waitTime > 0 && !sendImmediately()) {
try {
wait(ibrInterval > 0 && ibrInterval < waitTime? ibrInterval: waitTime);
} catch (InterruptedException ie) {
LOG.warn(getClass().getSimpleName() + " interrupted");
}
}
} {code}
We can see that wait(waitime) will hold synchronized, if ibr interval is
enabled or heartbeat time is not reached. Then the lock will block
notifyNamenodeBlock function which is widely used in
deleting/creating/finalizing/opening blocks, then the speed of DataNode IO will
slow down. Here is the graph of blocking relationship
!image-2022-01-21-22-52-52-912.png!
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