Jacek Furmankiewicz created CASSANDRA-7361: ----------------------------------------------
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 81920.0 81920.0 0.0 4097.0 655360.0 168270.8 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 168561.5 7569408.0 7202855.6 43280.0 25855.8 5271 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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. -- This message was sent by Atlassian JIRA (v6.2#6252)