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https://issues.apache.org/jira/browse/HBASE-8927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706031#comment-13706031
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stack commented on HBASE-8927:
------------------------------
Yeah on what javadoc says but src is quoted in this thread:
http://stackoverflow.com/questions/510462/is-system-nanotime-completely-useless
{code}
jlong os::javaTimeMillis() {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
}
jlong os::javaTimeNanos() {
if (Linux::supports_monotonic_clock()) {
struct timespec tp;
int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp);
assert(status == 0, "gettime error");
jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
return result;
} else {
timeval time;
int status = gettimeofday(&time, NULL);
assert(status != -1, "linux error");
jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
return 1000 * usecs;
}
}
{code}
The above looks pretty good to me.
> Use nano time instead of mili time everywhere
> ---------------------------------------------
>
> Key: HBASE-8927
> URL: https://issues.apache.org/jira/browse/HBASE-8927
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Attachments: 8927.txt
>
>
> Less collisions and we are paying the price of a long anyways so might as
> well fill it.
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