Jacek Furmankiewicz created CASSANDRA-7361:
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             Summary: Cassandra locks up in full GC, unable to free memory
                 Key: CASSANDRA-7361
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7361
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: Ubuntu, RedHat, JDK 1.7
            Reporter: Jacek Furmankiewicz
            Priority: Blocker


We have a long running batch load process, which runs for many hours.
Massive amount of writes, in large mutation batches (we increase the thrift 
frame size to 45 MB).

Everything goes well, but after about 3 hrs of processing everything locks up. 
We start getting NoHostsAvailable exceptions on the Java application side (with 
Astyanax as our driver), eventually socket timeouts.

Looking at Cassandra, we can see that it is using nearly the full 8GB of heap 
and unable to free it. It spends most of its time in full GC, but the amount of 
memory does not go down.

Here is a long sample from jstat to show this over an extended time period

e.g.

{quote}
-bash-4.1$ $JAVA_HOME/bin/jstat -gc 3728 5s
 S0C    S1C    S0U    S1U      EC       EU        OC         OU       PC     PU 
   YGC     YGCT    FGC    FGCT     GCT   
81920.0 81920.0  0.0   4097.0 655360.0 150419.0 7569408.0  7202990.3  43280.0 
25855.8   5271  268.378 4940  9877.726 10146.104
81920.0 81920.0  0.0   4097.0 655360.0 150657.2 7569408.0  7202990.3  43280.0 
25855.8   5271  268.378 4940  9877.726 10146.104
81920.0 81920.0  0.0   4097.0 655360.0 150708.5 7569408.0  7202990.3  43280.0 
25855.8   5271  268.378 4941  9877.950 10146.328
81920.0 81920.0  0.0   4097.0 655360.0 150920.4 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4942  9878.085 10146.463
81920.0 81920.0  0.0   4097.0 655360.0 150930.7 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4942  9878.085 10146.463
81920.0 81920.0  0.0   4097.0 655360.0 150998.2 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4942  9878.085 10146.463
81920.0 81920.0  0.0   4097.0 655360.0 151335.6 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4943  9878.253 10146.630
81920.0 81920.0  0.0   4097.0 655360.0 151483.3 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4944  9878.389 10146.766
81920.0 81920.0  0.0   4097.0 655360.0 151750.4 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4944  9878.389 10146.766
81920.0 81920.0  0.0   4097.0 655360.0 151752.5 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4944  9878.389 10146.766
81920.0 81920.0  0.0   4097.0 655360.0 151997.4 7569408.0  7202990.2  43280.0 
25855.8   5271  268.378 4945  9878.593 10146.970
81920.0 81920.0  0.0   4097.0 655360.0 152063.0 7569408.0  7202988.6  43280.0 
25855.8   5271  268.378 4946  9878.732 10147.110
81920.0 81920.0  0.0   4097.0 655360.0 152256.2 7569408.0  7202988.6  43280.0 
25855.8   5271  268.378 4946  9878.732 10147.110
81920.0 81920.0  0.0   4097.0 655360.0 152276.2 7569408.0  7202988.6  43280.0 
25855.8   5271  268.378 4946  9878.732 10147.110
81920.0 81920.0  0.0   4097.0 655360.0 152276.2 7569408.0  7202988.6  43280.0 
25855.8   5271  268.378 4947  9878.968 10147.345
81920.0 81920.0  0.0   4097.0 655360.0 152525.3 7569408.0  7202857.5  43280.0 
25855.8   5271  268.378 4948  9879.107 10147.484
81920.0 81920.0  0.0   4097.0 655360.0 152673.0 7569408.0  7202857.5  43280.0 
25855.8   5271  268.378 4948  9879.107 10147.484
81920.0 81920.0  0.0   4097.0 655360.0 152855.5 7569408.0  7202857.5  43280.0 
25855.8   5271  268.378 4948  9879.107 10147.484
81920.0 81920.0  0.0   4097.0 655360.0 152871.3 7569408.0  7202857.5  43280.0 
25855.8   5271  268.378 4949  9879.275 10147.653
81920.0 81920.0  0.0   4097.0 655360.0 153116.2 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4950  9879.415 10147.793
81920.0 81920.0  0.0   4097.0 655360.0 153191.6 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4950  9879.415 10147.793
81920.0 81920.0  0.0   4097.0 655360.0 153454.3 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4950  9879.415 10147.793
81920.0 81920.0  0.0   4097.0 655360.0 153528.0 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4951  9879.583 10147.961
81920.0 81920.0  0.0   4097.0 655360.0 153766.1 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4952  9879.721 10148.099
81920.0 81920.0  0.0   4097.0 655360.0 153791.9 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4952  9879.721 10148.099
81920.0 81920.0  0.0   4097.0 655360.0 153855.1 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4952  9879.721 10148.099
81920.0 81920.0  0.0   4097.0 655360.0 154114.8 7569408.0  7202857.0  43280.0 
25855.8   5271  268.378 4953  9879.953 10148.331
81920.0 81920.0  0.0   4097.0 655360.0 154118.8 7569408.0  7202856.8  43280.0 
25855.8   5271  268.378 4954  9880.097 10148.474
81920.0 81920.0  0.0   4097.0 655360.0 154382.7 7569408.0  7202856.8  43280.0 
25855.8   5271  268.378 4954  9880.097 10148.474
81920.0 81920.0  0.0   4097.0 655360.0 154511.8 7569408.0  7202856.8  43280.0 
25855.8   5271  268.378 4954  9880.097 10148.474
81920.0 81920.0  0.0   4097.0 655360.0 154699.2 7569408.0  7202856.8  43280.0 
25855.8   5271  268.378 4955  9880.273 10148.650
81920.0 81920.0  0.0   4097.0 655360.0 154707.4 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4956  9880.273 10148.650
81920.0 81920.0  0.0   4097.0 655360.0 154985.2 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4956  9880.414 10148.792
81920.0 81920.0  0.0   4097.0 655360.0 155006.1 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4956  9880.414 10148.792
81920.0 81920.0  0.0   4097.0 655360.0 155050.8 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4957  9880.585 10148.963
81920.0 81920.0  0.0   4097.0 655360.0 155233.1 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4957  9880.585 10148.963
81920.0 81920.0  0.0   4097.0 655360.0 155536.7 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4958  9880.730 10149.108
81920.0 81920.0  0.0   4097.0 655360.0 156764.1 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4958  9880.730 10149.108
81920.0 81920.0  0.0   4097.0 655360.0 156829.3 7569408.0  7202856.7  43280.0 
25855.8   5271  268.378 4959  9880.963 10149.341
81920.0 81920.0  0.0   4097.0 655360.0 157015.2 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4959  9880.963 10149.341
81920.0 81920.0  0.0   4097.0 655360.0 157089.1 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4960  9881.104 10149.481
81920.0 81920.0  0.0   4097.0 655360.0 157353.1 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4960  9881.104 10149.481
81920.0 81920.0  0.0   4097.0 655360.0 157368.8 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4961  9881.279 10149.656
81920.0 81920.0  0.0   4097.0 655360.0 157608.5 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4961  9881.279 10149.656
81920.0 81920.0  0.0   4097.0 655360.0 157684.2 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4962  9881.422 10149.800
81920.0 81920.0  0.0   4097.0 655360.0 157922.4 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4962  9881.422 10149.800
81920.0 81920.0  0.0   4097.0 655360.0 157959.9 7569408.0  7202856.6  43280.0 
25855.8   5271  268.378 4963  9881.600 10149.977
81920.0 81920.0  0.0   4097.0 655360.0 158004.8 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4963  9881.600 10149.977
81920.0 81920.0  0.0   4097.0 655360.0 158197.6 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4964  9881.742 10150.120
81920.0 81920.0  0.0   4097.0 655360.0 158209.8 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4964  9881.742 10150.120
81920.0 81920.0  0.0   4097.0 655360.0 158473.8 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4965  9881.920 10150.297
81920.0 81920.0  0.0   4097.0 655360.0 158473.8 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4965  9881.920 10150.297
81920.0 81920.0  0.0   4097.0 655360.0 158769.7 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4966  9882.063 10150.441
81920.0 81920.0  0.0   4097.0 655360.0 158796.6 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4966  9882.063 10150.441
81920.0 81920.0  0.0   4097.0 655360.0 159076.4 7569408.0  7202856.5  43280.0 
25855.8   5271  268.378 4966  9882.063 10150.441
81920.0 81920.0  0.0   4097.0 655360.0 159080.7 7569408.0  7202856.4  43280.0 
25855.8   5271  268.378 4967  9882.250 10150.628
81920.0 81920.0  0.0   4097.0 655360.0 159190.8 7569408.0  7202856.4  43280.0 
25855.8   5271  268.378 4968  9882.394 10150.772
81920.0 81920.0  0.0   4097.0 655360.0 159391.8 7569408.0  7202856.4  43280.0 
25855.8   5271  268.378 4968  9882.394 10150.772
81920.0 81920.0  0.0   4097.0 655360.0 159697.5 7569408.0  7202856.4  43280.0 
25855.8   5271  268.378 4968  9882.394 10150.772
81920.0 81920.0  0.0   4097.0 655360.0 159737.1 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4969  9882.636 10151.014
81920.0 81920.0  0.0   4097.0 655360.0 159737.1 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4970  9882.782 10151.159
81920.0 81920.0  0.0   4097.0 655360.0 159958.2 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4970  9882.782 10151.159
81920.0 81920.0  0.0   4097.0 655360.0 159985.0 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4970  9882.782 10151.159
81920.0 81920.0  0.0   4097.0 655360.0 160249.0 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4971  9882.974 10151.352
81920.0 81920.0  0.0   4097.0 655360.0 160249.0 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4972  9883.121 10151.499
81920.0 81920.0  0.0   4097.0 655360.0 160361.3 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4972  9883.121 10151.499
81920.0 81920.0  0.0   4097.0 655360.0 160638.2 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4972  9883.121 10151.499
81920.0 81920.0  0.0   4097.0 655360.0 160894.9 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4973  9883.368 10151.746
81920.0 81920.0  0.0   4097.0 655360.0 160920.7 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4974  9883.519 10151.897
81920.0 81920.0  0.0   4097.0 655360.0 160920.7 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4974  9883.519 10151.897
81920.0 81920.0  0.0   4097.0 655360.0 161139.5 7569408.0  7202856.3  43280.0 
25855.8   5271  268.378 4975  9883.519 10151.897
81920.0 81920.0  0.0   4097.0 655360.0 161168.4 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4975  9883.735 10152.113
81920.0 81920.0  0.0   4097.0 655360.0 161427.2 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4976  9883.884 10152.262
81920.0 81920.0  0.0   4097.0 655360.0 161446.2 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4976  9883.884 10152.262
81920.0 81920.0  0.0   4097.0 655360.0 161490.9 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4976  9883.884 10152.262
81920.0 81920.0  0.0   4097.0 655360.0 161673.2 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4977  9884.066 10152.444
81920.0 81920.0  0.0   4097.0 655360.0 162002.3 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4978  9884.217 10152.595
81920.0 81920.0  0.0   4097.0 655360.0 162023.6 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4978  9884.217 10152.595
81920.0 81920.0  0.0   4097.0 655360.0 162086.0 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4978  9884.217 10152.595
81920.0 81920.0  0.0   4097.0 655360.0 162271.9 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4979  9884.405 10152.782
81920.0 81920.0  0.0   4097.0 655360.0 162537.0 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4980  9884.557 10152.935
81920.0 81920.0  0.0   4097.0 655360.0 162696.2 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4980  9884.557 10152.935
81920.0 81920.0  0.0   4097.0 655360.0 162696.2 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4980  9884.557 10152.935
81920.0 81920.0  0.0   4097.0 655360.0 162740.8 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4981  9884.748 10153.125
81920.0 81920.0  0.0   4097.0 655360.0 163009.5 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4982  9884.901 10153.279
81920.0 81920.0  0.0   4097.0 655360.0 163285.1 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4982  9884.901 10153.279
81920.0 81920.0  0.0   4097.0 655360.0 163285.1 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4982  9884.901 10153.279
81920.0 81920.0  0.0   4097.0 655360.0 163397.4 7569408.0  7202856.1  43280.0 
25855.8   5271  268.378 4983  9885.093 10153.471
81920.0 81920.0  0.0   4097.0 655360.0 163590.2 7569408.0  7202855.9  43280.0 
25855.8   5271  268.378 4984  9885.251 10153.628
81920.0 81920.0  0.0   4097.0 655360.0 165038.0 7569408.0  7202855.9  43280.0 
25855.8   5271  268.378 4984  9885.251 10153.628
81920.0 81920.0  0.0   4097.0 655360.0 165142.5 7569408.0  7202855.9  43280.0 
25855.8   5271  268.378 4984  9885.251 10153.628
81920.0 81920.0  0.0   4097.0 655360.0 165142.5 7569408.0  7202855.9  43280.0 
25855.8   5271  268.378 4985  9885.435 10153.813
81920.0 81920.0  0.0   4097.0 655360.0 165391.7 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4986  9885.588 10153.966
81920.0 81920.0  0.0   4097.0 655360.0 165401.9 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4986  9885.588 10153.966
81920.0 81920.0  0.0   4097.0 655360.0 165665.9 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4986  9885.588 10153.966
81920.0 81920.0  0.0   4097.0 655360.0 165667.9 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4987  9885.848 10154.226
81920.0 81920.0  0.0   4097.0 655360.0 165712.6 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4988  9886.002 10154.379
81920.0 81920.0  0.0   4097.0 655360.0 165971.0 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4988  9886.002 10154.379
81920.0 81920.0  0.0   4097.0 655360.0 166254.9 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4988  9886.002 10154.379
81920.0 81920.0  0.0   4097.0 655360.0 166257.1 7569408.0  7202855.8  43280.0 
25855.8   5271  268.378 4989  9886.256 10154.633
81920.0 81920.0  0.0   4097.0 655360.0 166257.1 7569408.0  7202855.7  43280.0 
25855.8   5271  268.378 4989  9886.256 10154.633
81920.0 81920.0  0.0   4097.0 655360.0 166496.5 7569408.0  7202855.7  43280.0 
25855.8   5271  268.378 4990  9886.412 10154.789
81920.0 81920.0  0.0   4097.0 655360.0 166843.1 7569408.0  7202855.7  43280.0 
25855.8   5271  268.378 4990  9886.412 10154.789
81920.0 81920.0  0.0   4097.0 655360.0 166852.0 7569408.0  7202855.7  43280.0 
25855.8   5271  268.378 4991  9886.605 10154.983
81920.0 81920.0  0.0   4097.0 655360.0 166852.0 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4991  9886.605 10154.983
81920.0 81920.0  0.0   4097.0 655360.0 166908.3 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4992  9886.762 10155.140
81920.0 81920.0  0.0   4097.0 655360.0 167122.1 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4992  9886.762 10155.140
81920.0 81920.0  0.0   4097.0 655360.0 167375.4 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4993  9887.023 10155.401
81920.0 81920.0  0.0   4097.0 655360.0 167375.4 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4993  9887.023 10155.401
81920.0 81920.0  0.0   4097.0 655360.0 167377.6 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4994  9887.179 10155.557
81920.0 81920.0  0.0   4097.0 655360.0 167683.0 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4994  9887.179 10155.557
81920.0 81920.0  0.0   4097.0 655360.0 167948.1 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4994  9887.179 10155.557
81920.0 81920.0  0.0   4097.0 655360.0 167968.7 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4995  9887.376 10155.754
81920.0 81920.0  0.0   4097.0 655360.0 168034.2 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4996  9887.534 10155.911
81920.0 81920.0  0.0   4097.0 655360.0 168094.6 7569408.0  7202855.6  43280.0 
25855.8   5271  268.378 4996  9887.534 10155.911
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25855.8   5271  268.378 5044  9897.033 10165.411
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25855.8   5271  268.378 5046  9897.492 10165.869
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25855.8   5271  268.378 5048  9897.886 10166.264
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25855.8   5271  268.378 5048  9897.886 10166.264
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25855.8   5271  268.378 5049  9898.095 10166.472
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25855.8   5271  268.378 5050  9898.276 10166.654
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25855.8   5271  268.378 5052  9898.752 10167.130
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25855.8   5271  268.378 5052  9898.752 10167.130
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25855.8   5271  268.378 5052  9898.752 10167.130
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25855.8   5271  268.378 5053  9899.045 10167.423
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25855.8   5271  268.378 5053  9899.045 10167.423
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25855.8   5271  268.378 5054  9899.230 10167.608
81920.0 81920.0  0.0   4097.0 655360.0 197037.8 7569408.0  7202848.8  43280.0 
25855.8   5271  268.378 5055  9899.451 10167.829
81920.0 81920.0  0.0   4097.0 655360.0 197541.2 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5055  9899.451 10167.829
81920.0 81920.0  0.0   4097.0 655360.0 197541.2 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5056  9899.638 10168.015
81920.0 81920.0  0.0   4097.0 655360.0 197614.9 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5056  9899.638 10168.015
81920.0 81920.0  0.0   4097.0 655360.0 197617.0 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5057  9899.858 10168.235
81920.0 81920.0  0.0   4097.0 655360.0 198123.4 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5057  9899.858 10168.235
81920.0 81920.0  0.0   4097.0 655360.0 198130.2 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5058  9900.043 10168.420
81920.0 81920.0  0.0   4097.0 655360.0 198140.7 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5058  9900.043 10168.420
81920.0 81920.0  0.0   4097.0 655360.0 199340.2 7569408.0  7202848.7  43280.0 
25855.8   5271  268.378 5059  9900.340 10168.718
81920.0 81920.0  0.0   4097.0 655360.0 199580.3 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5059  9900.340 10168.718
81920.0 81920.0  0.0   4097.0 655360.0 199843.5 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5060  9900.528 10168.905
81920.0 81920.0  0.0   4097.0 655360.0 199917.3 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5060  9900.528 10168.905
81920.0 81920.0  0.0   4097.0 655360.0 200007.7 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5061  9900.528 10168.905
81920.0 81920.0  0.0   4097.0 655360.0 200009.8 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5061  9900.818 10169.196
81920.0 81920.0  0.0   4097.0 655360.0 200466.7 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5062  9901.005 10169.383
81920.0 81920.0  0.0   4097.0 655360.0 200513.2 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5062  9901.005 10169.383
81920.0 81920.0  0.0   4097.0 655360.0 200521.4 7569408.0  7202848.6  43280.0 
25855.8   5271  268.378 5062  9901.005 10169.383
81920.0 81920.0  0.0   4097.0 655360.0 200521.4 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5063  9901.302 10169.680
81920.0 81920.0  0.0   4097.0 655360.0 200759.4 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5064  9901.490 10169.868
81920.0 81920.0  0.0   4097.0 655360.0 201018.1 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5064  9901.490 10169.868
81920.0 81920.0  0.0   4097.0 655360.0 201045.0 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5064  9901.490 10169.868
81920.0 81920.0  0.0   4097.0 655360.0 201112.5 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5065  9901.710 10170.087
81920.0 81920.0  0.0   4097.0 655360.0 201112.5 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5066  9901.900 10170.277
81920.0 81920.0  0.0   4097.0 655360.0 201590.6 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5066  9901.900 10170.277
81920.0 81920.0  0.0   4097.0 655360.0 201613.2 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5066  9901.900 10170.277
81920.0 81920.0  0.0   4097.0 655360.0 201640.1 7569408.0  7202848.5  43280.0 
25855.8   5271  268.378 5067  9902.200 10170.578
81920.0 81920.0  0.0   4097.0 655360.0 201717.4 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5068  9902.390 10170.768
81920.0 81920.0  0.0   4097.0 655360.0 202023.1 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5068  9902.390 10170.768
81920.0 81920.0  0.0   4097.0 655360.0 202267.7 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5068  9902.390 10170.768
81920.0 81920.0  0.0   4097.0 655360.0 202278.1 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5069  9902.693 10171.071
81920.0 81920.0  0.0   4097.0 655360.0 202362.5 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5070  9902.883 10171.261
81920.0 81920.0  0.0   4097.0 655360.0 202600.7 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5070  9902.883 10171.261
81920.0 81920.0  0.0   4097.0 655360.0 202854.2 7569408.0  7202848.4  43280.0 
25855.8   5271  268.378 5070  9902.883 10171.261
81920.0 81920.0  0.0   4097.0 655360.0 202926.5 7569408.0  7202848.3  43280.0 
25855.8   5271  268.378 5071  9903.113 10171.491
81920.0 81920.0  0.0   4097.0 655360.0 202934.8 7569408.0  7202848.2  43280.0 
25855.8   5271  268.378 5072  9903.303 10171.681
81920.0 81920.0  0.0   4097.0 655360.0 202955.5 7569408.0  7202848.2  43280.0 
25855.8   5271  268.378 5072  9903.303 10171.681
81920.0 81920.0  0.0   4097.0 655360.0 203291.3 7569408.0  7202848.2  43280.0 
25855.8   5271  268.378 5072  9903.303 10171.681
81920.0 81920.0  0.0   4097.0 655360.0 203517.0 7569408.0  7202848.2  43280.0 
25855.8   5271  268.378 5073  9903.607 10171.985
81920.0 81920.0  0.0   4097.0 655360.0 203539.0 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5074  9903.799 10172.177
81920.0 81920.0  0.0   4097.0 655360.0 203557.6 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5074  9903.799 10172.177
81920.0 81920.0  0.0   4097.0 655360.0 203795.7 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5074  9903.799 10172.177
81920.0 81920.0  0.0   4097.0 655360.0 204042.6 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5075  9904.025 10172.403
81920.0 81920.0  0.0   4097.0 655360.0 204042.6 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5076  9904.220 10172.598
81920.0 81920.0  0.0   4097.0 655360.0 204135.0 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5076  9904.220 10172.598
81920.0 81920.0  0.0   4097.0 655360.0 204137.0 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5076  9904.220 10172.598
81920.0 81920.0  0.0   4097.0 655360.0 204582.2 7569408.0  7202848.0  43280.0 
25855.8   5271  268.378 5077  9904.451 10172.829
81920.0 81920.0  0.0   4097.0 655360.0 204633.6 7569408.0  7202847.9  43280.0 
25855.8   5271  268.378 5078  9904.644 10173.022
81920.0 81920.0  0.0   4097.0 655360.0 204660.4 7569408.0  7202847.9  43280.0 
25855.8   5271  268.378 5078  9904.644 10173.022
81920.0 81920.0  0.0   4097.0 655360.0 204741.6 7569408.0  7202847.9  43280.0 
25855.8   5271  268.378 5078  9904.644 10173.022
81920.0 81920.0  0.0   4097.0 655360.0 205000.7 7569408.0  7202847.9  43280.0 
25855.8   5271  268.378 5079  9904.952 10173.329
81920.0 81920.0  0.0   4097.0 655360.0 205226.3 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5080  9904.952 10173.329
81920.0 81920.0  0.0   4097.0 655360.0 205228.5 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5080  9905.144 10173.521
81920.0 81920.0  0.0   4097.0 655360.0 205267.2 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5080  9905.144 10173.521
81920.0 81920.0  0.0   4097.0 655360.0 205267.2 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5081  9905.369 10173.746
81920.0 81920.0  0.0   4097.0 655360.0 205698.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5081  9905.369 10173.746
81920.0 81920.0  0.0   4097.0 655360.0 205752.3 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5082  9905.563 10173.940
81920.0 81920.0  0.0   4097.0 655360.0 205844.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5082  9905.563 10173.940
81920.0 81920.0  0.0   4097.0 655360.0 205846.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5083  9905.797 10174.174
81920.0 81920.0  0.0   4097.0 655360.0 206115.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5083  9905.797 10174.174
81920.0 81920.0  0.0   4097.0 655360.0 206406.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5084  9905.992 10174.369
81920.0 81920.0  0.0   4097.0 655360.0 207640.6 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5084  9905.992 10174.369
81920.0 81920.0  0.0   4097.0 655360.0 207650.8 7569408.0  7202847.8  43280.0 
25855.8   5271  268.378 5085  9906.220 10174.598
81920.0 81920.0  0.0   4097.0 655360.0 207908.0 7569408.0  7202847.7  43280.0 
25855.8   5271  268.378 5085  9906.220 10174.598
81920.0 81920.0  0.0   4097.0 655360.0 208149.9 7569408.0  7202847.7  43280.0 
25855.8   5271  268.378 5086  9906.417 10174.794
81920.0 81920.0  0.0   4097.0 655360.0 208201.3 7569408.0  7202847.7  43280.0 
25855.8   5271  268.378 5086  9906.417 10174.794
81920.0 81920.0  0.0   4097.0 655360.0 208240.0 7569408.0  7202847.7  43280.0 
25855.8   5271  268.378 5087  9906.417 10174.794
81920.0 81920.0  0.0   4097.0 655360.0 208240.0 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5087  9906.654 10175.031
81920.0 81920.0  0.0   4097.0 655360.0 208501.2 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5088  9906.853 10175.230
81920.0 81920.0  0.0   4097.0 655360.0 208726.8 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5088  9906.853 10175.230
81920.0 81920.0  0.0   4097.0 655360.0 208726.8 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5088  9906.853 10175.230
81920.0 81920.0  0.0   4097.0 655360.0 208821.1 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5089  9907.164 10175.542
81920.0 81920.0  0.0   4097.0 655360.0 209059.2 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5090  9907.365 10175.743
81920.0 81920.0  0.0   4097.0 655360.0 209398.1 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5090  9907.365 10175.743
81920.0 81920.0  0.0   4097.0 655360.0 209400.4 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5090  9907.365 10175.743
81920.0 81920.0  0.0   4097.0 655360.0 209408.6 7569408.0  7202847.6  43280.0 
25855.8   5271  268.378 5091  9907.596 10175.973
81920.0 81920.0  0.0   4097.0 655360.0 209427.3 7569408.0  7202847.5  43280.0 
25855.8   5271  268.378 5092  9907.793 10176.171
81920.0 81920.0  0.0   4097.0 655360.0 209684.5 7569408.0  7202847.5  43280.0 
25855.8   5271  268.378 5092  9907.793 10176.171
81920.0 81920.0  0.0   4097.0 655360.0 209910.1 7569408.0  7202847.5  43280.0 
25855.8   5271  268.378 5092  9907.793 10176.171
81920.0 81920.0  0.0   4097.0 655360.0 209932.1 7569408.0  7202847.5  43280.0 
25855.8   5271  268.378 5093  9908.028 10176.405
81920.0 81920.0  0.0   4097.0 655360.0 209952.8 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5094  9908.225 10176.603
81920.0 81920.0  0.0   4097.0 655360.0 210190.9 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5094  9908.225 10176.603
81920.0 81920.0  0.0   4097.0 655360.0 210500.9 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5094  9908.225 10176.603
81920.0 81920.0  0.0   4097.0 655360.0 210500.9 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5095  9908.470 10176.848
81920.0 81920.0  0.0   4097.0 655360.0 210509.1 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5096  9908.668 10177.046
81920.0 81920.0  0.0   4097.0 655360.0 210785.8 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5096  9908.668 10177.046
81920.0 81920.0  0.0   4097.0 655360.0 210818.8 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5096  9908.668 10177.046
81920.0 81920.0  0.0   4097.0 655360.0 211109.8 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5097  9908.902 10177.279
81920.0 81920.0  0.0   4097.0 655360.0 211175.3 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5098  9909.103 10177.481
81920.0 81920.0  0.0   4097.0 655360.0 211267.7 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5098  9909.103 10177.481
81920.0 81920.0  0.0   4097.0 655360.0 211527.0 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5098  9909.103 10177.481
81920.0 81920.0  0.0   4097.0 655360.0 211754.7 7569408.0  7202847.4  43280.0 
25855.8   5271  268.378 5099  9909.341 10177.718
81920.0 81920.0  0.0   4097.0 655360.0 211766.4 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5100  9909.542 10177.920
81920.0 81920.0  0.0   4097.0 655360.0 211840.2 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5100  9909.542 10177.920
81920.0 81920.0  0.0   4097.0 655360.0 212116.0 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5100  9909.542 10177.920
81920.0 81920.0  0.0   4097.0 655360.0 212122.8 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5101  9909.783 10178.161
81920.0 81920.0  0.0   4097.0 655360.0 212411.4 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5102  9909.783 10178.161
81920.0 81920.0  0.0   4097.0 655360.0 212424.6 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5102  9909.987 10178.365
81920.0 81920.0  0.0   4097.0 655360.0 212432.8 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5102  9909.987 10178.365
81920.0 81920.0  0.0   4097.0 655360.0 212720.2 7569408.0  7202847.2  43280.0 
25855.8   5271  268.378 5103  9910.313 10178.690
81920.0 81920.0  0.0   4097.0 655360.0 212945.8 7569408.0  7202847.1  43280.0 
25855.8   5271  268.378 5103  9910.313 10178.690
81920.0 81920.0  0.0   4097.0 655360.0 212945.8 7569408.0  7202847.1  43280.0 
25855.8   5271  268.378 5104  9910.516 10178.893
81920.0 81920.0  0.0   4097.0 655360.0 212958.1 7569408.0  7202847.1  43280.0 
25855.8   5271  268.378 5104  9910.516 10178.893
81920.0 81920.0  0.0   4097.0 655360.0 213301.3 7569408.0  7202847.1  43280.0 
25855.8   5271  268.378 5105  9910.851 10179.229
81920.0 81920.0  0.0   4097.0 655360.0 213482.3 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5105  9910.851 10179.229
81920.0 81920.0  0.0   4097.0 655360.0 213527.0 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5106  9911.056 10179.433
81920.0 81920.0  0.0   4097.0 655360.0 213547.0 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5106  9911.056 10179.433
81920.0 81920.0  0.0   4097.0 655360.0 213612.5 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5107  9911.307 10179.684
81920.0 81920.0  0.0   4097.0 655360.0 213892.6 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5107  9911.307 10179.684
81920.0 81920.0  0.0   4097.0 655360.0 214133.8 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5108  9911.513 10179.891
81920.0 81920.0  0.0   4097.0 655360.0 214133.8 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5108  9911.513 10179.891
81920.0 81920.0  0.0   4097.0 655360.0 215407.3 7569408.0  7202847.0  43280.0 
25855.8   5271  268.378 5108  9911.513 10179.891
81920.0 81920.0  0.0   4097.0 655360.0 215677.9 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5109  9911.822 10180.199
81920.0 81920.0  0.0   4097.0 655360.0 215879.9 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5110  9912.026 10180.404
81920.0 81920.0  0.0   4097.0 655360.0 215924.5 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5110  9912.026 10180.404
81920.0 81920.0  0.0   4097.0 655360.0 215932.7 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5110  9912.026 10180.404
81920.0 81920.0  0.0   4097.0 655360.0 216189.6 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5111  9912.347 10180.725
81920.0 81920.0  0.0   4097.0 655360.0 216208.6 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5112  9912.556 10180.934
81920.0 81920.0  0.0   4097.0 655360.0 216504.1 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5112  9912.556 10180.934
81920.0 81920.0  0.0   4097.0 655360.0 216517.9 7569408.0  7202846.9  43280.0 
25855.8   5271  268.378 5112  9912.556 10180.934
{quote}

This continues even after we shut down our app. Nothing is connected to 
Cassandra any more, yet it is still stuck in full GC and cannot free up memory.

Running nodetool tpstats shows that nothing is pending, all seems OK:

{quote}
Pool Name                    Active   Pending      Completed   Blocked  All 
time blocked
ReadStage                         0         0       69555935         0          
       0
RequestResponseStage              0         0              0         0          
       0
MutationStage                     0         0       73123690         0          
       0
ReadRepairStage                   0         0              0         0          
       0
ReplicateOnWriteStage             0         0              0         0          
       0
GossipStage                       0         0              0         0          
       0
CacheCleanupExecutor              0         0              0         0          
       0
MigrationStage                    0         0             46         0          
       0
MemoryMeter                       0         0           1125         0          
       0
FlushWriter                       0         0            824         0          
      30
ValidationExecutor                0         0              0         0          
       0
InternalResponseStage             0         0             23         0          
       0
AntiEntropyStage                  0         0              0         0          
       0
MemtablePostFlusher               0         0           1783         0          
       0
MiscStage                         0         0              0         0          
       0
PendingRangeCalculator            0         0              1         0          
       0
CompactionExecutor                0         0          74330         0          
       0
commitlog_archiver                0         0              0         0          
       0
HintedHandoff                     0         0              0         0          
       0

Message type           Dropped
RANGE_SLICE                  0
READ_REPAIR                  0
PAGED_RANGE                  0
BINARY                       0
READ                       585
MUTATION                 75775
_TRACE                       0
REQUEST_RESPONSE             0
COUNTER_MUTATION             0
{quote}

We had this happen on 2 separate boxes, one with 2.0.6, the other with 2.0.8.
Right now this is a total blocker for us. We are unable to process the customer 
data and have to abort in the middle of large processing.

This is a new customer, so we did not have a chance to see if this occurred 
with 1.1 or 1.2 in the past (we moved to 2.0 recently).

We have the Cassandra process still running, pls let us know if there is 
anything else we could run to give you more insight.



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