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Understand Impalad memz Breakdown

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Contributor

Hi,

 

Could you help me understand the meaning of Total, Peak and Exprs in Breakdown section of the impalad memz page? In my understanding, Peak mem is the Peak memory we've seen so far for that component (Query, Frag or Node etc); Total is the current timepoint's total memory consumption of that component on the machine; and what does (total and Peak of) Exprs mean?

 

Here's a snippet:

 

Process: Limit=256.00 MB Total=142.79 MB Peak=264.24 MB
  Free Disk IO Buffers: Total=4.50 MB Peak=102.56 MB
  RequestPool=root.centos: Total=11.60 MB Peak=187.26 MB
    Query(e040ae477e9d2aec:87d527e600000000): Total=11.60 MB Peak=13.45 MB
      Fragment e040ae477e9d2aec:87d527e600000005: Total=10.30 MB Peak=10.98 MB
        AGGREGATION_NODE (id=3): Total=10.29 MB Peak=10.29 MB
          Exprs: Total=4.00 KB Peak=4.00 KB
        EXCHANGE_NODE (id=2): Total=0 Peak=0
        DataStreamRecvr: Total=0 Peak=0
        HdfsTableSink: Total=0 Peak=0
        CodeGen: Total=3.32 KB Peak=696.50 KB
      Block Manager: Limit=156.00 MB Total=8.50 MB Peak=8.50 MB
      Fragment e040ae477e9d2aec:87d527e600000002: Total=1.30 MB Peak=2.47 MB
        AGGREGATION_NODE (id=1): Total=1.29 MB Peak=1.29 MB
          Exprs: Total=4.00 KB Peak=4.00 KB
        HDFS_SCAN_NODE (id=0): Total=0 Peak=0
        DataStreamSender (dst_id=2): Total=3.14 KB Peak=3.14 KB
        CodeGen: Total=0 Peak=1.16 MB

 

Thanks

 

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Got it, thanks Tim.