getContentSummary should hold the FSNamesystem readlock
-------------------------------------------------------
Key: HDFS-1775
URL: https://issues.apache.org/jira/browse/HDFS-1775
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Dmytro Molkov
Assignee: Dmytro Molkov
Priority: Minor
Right now the getContentSummary call on the namenode only holds the FSDirectory
lock, but not the FSNamesystem lock. What we are seeing because of that is:
1) getContentSummary takes the read lock on FSDirectory
2) the write operation comes and takes a write lock on FSNamesystem and waits
for getContentSummary to finish to get a write lock on FSDirectory
As a result other read operations can't be executed. Since getContentSummary
can take a while to execute on large directories, the performance would be
improved if we hold a readlock while doing that.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
