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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13874) Fix 0.8 being hardcoded sum of blockcache + memstore; doesn't make sense when big heap
Date Tue, 09 Jun 2015 17:52:00 GMT
stack created HBASE-13874:
-----------------------------

             Summary: Fix 0.8 being hardcoded sum of blockcache + memstore; doesn't make sense
when big heap
                 Key: HBASE-13874
                 URL: https://issues.apache.org/jira/browse/HBASE-13874
             Project: HBase
          Issue Type: Task
            Reporter: stack


Fix this in HBaseConfiguration:

{code}
 79   private static void checkForClusterFreeMemoryLimit(Configuration conf) {
 80       float globalMemstoreLimit = conf.getFloat("hbase.regionserver.global.memstore.upperLimit",
0.4f);
 81       int gml = (int)(globalMemstoreLimit * CONVERT_TO_PERCENTAGE);
 82       float blockCacheUpperLimit =
 83         conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
 84           HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
 85       int bcul = (int)(blockCacheUpperLimit * CONVERT_TO_PERCENTAGE);
 86       if (CONVERT_TO_PERCENTAGE - (gml + bcul)
 87               < (int)(CONVERT_TO_PERCENTAGE *
 88                       HConstants.HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD)) {
 89           throw new RuntimeException(
 90             "Current heap configuration for MemStore and BlockCache exceeds " +
 91             "the threshold required for successful cluster operation. " +
 92             "The combined value cannot exceed 0.8. Please check " +
 93             "the settings for hbase.regionserver.global.memstore.upperLimit and " +
 94             "hfile.block.cache.size in your configuration. " +
 95             "hbase.regionserver.global.memstore.upperLimit is " +
 96             globalMemstoreLimit +
 97             " hfile.block.cache.size is " + blockCacheUpperLimit);
 98       }
 99   }
{code}

Hardcoding 0.8 doesn't make much sense in a heap of 100G+ (that is 20G over for hbase itself
-- more than enough).



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