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From "William Slacum (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4083) TabletServerResourceManager doesn't sanity check memory settings if native maps are being used
Date Thu, 17 Dec 2015 23:32:46 GMT
William Slacum created ACCUMULO-4083:
----------------------------------------

             Summary: TabletServerResourceManager doesn't sanity check memory settings if
native maps are being used
                 Key: ACCUMULO-4083
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4083
             Project: Accumulo
          Issue Type: Bug
          Components: tserver
    Affects Versions: 1.6.4
            Reporter: William Slacum
            Priority: Minor


Noticed that the TServer tries to fail fast if caches and memory maps are configured to use
more memory than the JVM has given to it via -Xmx. However, if native maps are being used,
this check fails. I recently had OOMEs kill TServers because their data block cache was 16gb
and the max heap was 16gb. 

Here's the check:

{code:title=TabletServer.java}
    Runtime runtime = Runtime.getRuntime();
    if (!usingNativeMap && maxMemory + dCacheSize + iCacheSize > runtime.maxMemory())
{
      throw new IllegalArgumentException(String.format(
          "Maximum tablet server map memory %,d and block cache sizes %,d is too large for
this JVM configuration %,d", maxMemory, dCacheSize + iCacheSize,
          runtime.maxMemory()));
    }
{code}

I think the check should still happen for index and data caches if native maps are being used.




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