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https://issues.apache.org/jira/browse/HBASE-5349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760641#comment-13760641
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Ted Yu commented on HBASE-5349:
-------------------------------
There're ^M's at the end of each line. Please generate patch on Linux.
For HeapMemoryAutoTuner:
It would be nice to put the patch on review board.
{code}
+ AutoTunerContext context = createTunerContext();^M
{code}
Do we need to create new context for each iteration of the chore ? Can one
instance be reused ?
{code}
+ LOG.debug("From HeapMemoryBalancer new memstoreSize: " + memstoreSize
+ "%. new blockCacheSize: " + blockCacheSize + "%");^M
{code}
I think the percent sign is not needed.
{code}
+ if (1 - (memstoreSize + blockCacheSize) <
HConstants.HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD) {^M
+ LOG.warn("Current heap configuration from HeapMemoryBalancer exceeds
"^M
+ + "the threshold required for successful cluster operation. "^M
{code}
Should some action be taken for the above case ? Otherwise tuning is
effectively disabled.
Since memstoreSize and blockCacheSize are local variables, I would expect some
action when result.needsTuning() returns true.
For DefaultHeapMemoryBalancerImpl, please add javadoc and audience annotation.
{code}
+ result.setMemstoreSize(context.getCurMemStoreSize() - step);^M
{code}
Should we check that the decrement would not produce negative result ?
Please add unit tests for the new classes.
> Automagically tweak global memstore and block cache sizes based on workload
> ---------------------------------------------------------------------------
>
> Key: HBASE-5349
> URL: https://issues.apache.org/jira/browse/HBASE-5349
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.92.0
> Reporter: Jean-Daniel Cryans
> Assignee: Anoop Sam John
> Attachments: WIP_HBASE-5349.patch
>
>
> Hypertable does a neat thing where it changes the size given to the CellCache
> (our MemStores) and Block Cache based on the workload. If you need an image,
> scroll down at the bottom of this link:
> http://www.hypertable.com/documentation/architecture/
> That'd be one less thing to configure.
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