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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17531) Memory tuning should account for undefined max heap
Date Wed, 25 Jan 2017 17:11:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838152#comment-15838152

Sean Busbey commented on HBASE-17531:

{{HeapMemoryManager}} blindly sends negative values into the block cache and memstore flusher
 if it gets an undefined for max heap.

> Memory tuning should account for undefined max heap
> ---------------------------------------------------
>                 Key: HBASE-17531
>                 URL: https://issues.apache.org/jira/browse/HBASE-17531
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Sean Busbey
> While going through HBASE-17522, I noticed that our calculations for heap usage don't
account for the JVM returning a -1 to mean "undefined" for the max heap. for example, {{getOnheapGlobalMemstoreSize}}
just does the calculation as it would if a normal number is returned, which means we end up
with -1 or 0 and then the logic in {{RegionServerAccounting.isAboveHighWaterMark()}} is always
going to say "we need to flush".

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