Nick Dimiduk created HBASE-14522:
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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]
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