Nick Dimiduk created HBASE-14522: ------------------------------------ Summary: Document or disable hsperfdata Key: HBASE-14522 URL: https://issues.apache.org/jira/browse/HBASE-14522 Project: HBase Issue Type: Task Components: documentation, Performance Reporter: Nick Dimiduk
{quote} The JVM by default exports statistics by mmap-ing a file in /tmp (hsperfdata). On Linux, modifying a memory mapped file can block until disk I/O completes, which can be hundreds of milliseconds. Since the JVM modifies these statistics during garbage collection and safepoints, this causes pauses that are hundreds of milliseconds long. {quote} Via [JVM mmap pause|http://www.evanjones.ca/jvm-mmap-pause.html]. We should add {{-XX:+PerfDisableSharedMem}} to our default options as was apparently done in CASSANDRA-9242 and/or document the presence of this bug so operators know to use tmpfs. Hat-tip [~vrodionov] -- This message was sent by Atlassian JIRA (v6.3.4#6332)