Prasanth Jayachandran created HADOOP-15598: ----------------------------------------------
Summary: DataChecksum calculate checksum is contented on hashtable lock Key: HADOOP-15598 URL: https://issues.apache.org/jira/browse/HADOOP-15598 Project: Hadoop Common Issue Type: Bug Components: common Affects Versions: 3.2.0 Reporter: Prasanth Jayachandran Attachments: Screen Shot 2018-07-11 at 1.45.06 AM.png When profiling a multi-threaded hive streaming ingest, observed lock contention on java.util.Properties getProperty() to check if os is "sparc". java.util.Properties internally uses HashTable. HashTable.get() is synchronized method. In the test application, on a 30s profile with 64 threads ~40% CPU time is spent on getProperty() contention. See attached snapshot. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org