Toshihiro Suzuki created HDFS-15217:
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Summary: Add more information to longest write/read lock held log
Key: HDFS-15217
URL: https://issues.apache.org/jira/browse/HDFS-15217
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Toshihiro Suzuki
Assignee: Toshihiro Suzuki
Currently, we can see the stack trace in the longest write/read lock held log,
but sometimes we need more information, for example, a target path of deletion:
{code:java}
2020-03-10 21:51:21,116 [main] INFO namenode.FSNamesystem
(FSNamesystemLock.java:writeUnlock(276)) - Number of suppressed write-lock
reports: 0
Longest write-lock held at 2020-03-10 21:51:21,107+0900 for 6ms via
java.lang.Thread.getStackTrace(Thread.java:1559)
org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1058)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.writeUnlock(FSNamesystemLock.java:257)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.writeUnlock(FSNamesystemLock.java:233)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.writeUnlock(FSNamesystem.java:1706)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.delete(FSNamesystem.java:3188)
...
{code}
Adding more information (opName, path, etc.) to the log is useful to
troubleshoot.
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