Uploaded image for project: 'HBase'
  1. HBase
  2. HBASE-11267

Dynamic metrics2 metrics may consume large amount of heap memory

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.99.0, 0.98.3
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      User sunweiei provided the following jmap output in 0.96 deployment:

       num     #instances         #bytes  class name
      ----------------------------------------------
         1:      14917882     3396492464  [C
         2:       1996994     2118021808  [B
         3:      43341650     1733666000  java.util.LinkedHashMap$Entry
         4:      14453983     1156550896  [Ljava.util.HashMap$Entry;
         5:      14446577      924580928  org.apache.hadoop.metrics2.lib.Interns$CacheWith2Keys$2
      

      Heap consumption by Interns$CacheWith2Keys$2 could be due to calls to Interns.info() in DynamicMetricsRegistry.
      This scenario would arise when large number of regions are tracked through metrics2.
      Interns class doesn't provide API to remove entries in its internal Map.
      Meaning, DynamicMetricsRegistry#clearMetrics() is unable to reclaim that part of heap.

        Attachments

        1. 11267-v1.txt
          3 kB
          Ted Yu

          Issue Links

            Activity

              People

              • Assignee:
                yuzhihong@gmail.com Ted Yu
                Reporter:
                yuzhihong@gmail.com Ted Yu
              • Votes:
                0 Vote for this issue
                Watchers:
                10 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: