[SPARK-24441][SS] Expose total estimated size of states in HDFSBackedStateStoreProvider#21469

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HeartSaVioR:SPARK-24441

Commits on Jul 2, 2018

[SPARK-24441][SS] Expose total size of states in HDFSBackedStateStoreProvider
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Add two more metrics: state cache hit / miss count in HDFS state provider
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Commits on Jul 11, 2018

Get rid of metricProviderLoaderCountOfVersionsInMap and also StateStoreCustomAverageMetric
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Commits on Jul 18, 2018

Commits on Jul 19, 2018

Refine a little more
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Commits on Aug 1, 2018

Address review comments from @tdas
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Commits on Aug 21, 2018

Use memoryUsedBytes to total memory usage of loaded versions
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