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https://issues.apache.org/jira/browse/CASSANDRA-12700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568006#comment-15568006
 ] 

Rajesh Radhakrishnan commented on CASSANDRA-12700:
--------------------------------------------------

Thank you [~jjirsa] and [~beobal] for the help. I will be getting the patched 
release soon when ever it is ready.

> During writing data into Cassandra 3.7.0 using Python driver 3.7 sometimes 
> Connection get lost, because of Server NullPointerException
> --------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-12700
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12700
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Cassandra cluster with two nodes running C* version 
> 3.7.0 and Python Driver 3.7 using Python 2.7.11. 
> OS: Red Hat Enterprise Linux 6.x x64, 
> RAM :8GB
> DISK :210GB
> Cores: 2
> Java 1.8.0_73 JRE
>            Reporter: Rajesh Radhakrishnan
>            Assignee: Jeff Jirsa
>             Fix For: 2.2.x, 3.0.x, 3.x, 4.x
>
>
> In our C* cluster we are using the latest Cassandra 3.7.0 (datastax-ddc.3.70) 
> with Python driver 3.7. Trying to insert 2 million row or more data into the 
> database, but sometimes we are getting "Null pointer Exception". 
> We are using Python 2.7.11 and Java 1.8.0_73 in the Cassandra nodes and in 
> the client its Python 2.7.12.
> {code:title=cassandra server log}
> ERROR [SharedPool-Worker-6] 2016-09-23 09:42:55,002 Message.java:611 - 
> Unexpected exception during request; channel = [id: 0xc208da86, 
> L:/IP1.IP2.IP3.IP4:9042 - R:/IP5.IP6.IP7.IP8:58418]
> java.lang.NullPointerException: null
>     at 
> org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:33)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:24)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:113) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.cql3.UntypedResultSet$Row.getBoolean(UntypedResultSet.java:273)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:85)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:81)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.getRoleFromTable(CassandraRoleManager.java:503)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.getRole(CassandraRoleManager.java:485)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.canLogin(CassandraRoleManager.java:298)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at org.apache.cassandra.service.ClientState.login(ClientState.java:227) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:79)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> [na:1.8.0_73]
>     at 
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) 
> [apache-cassandra-3.7.0.jar:3.7.0]
>     at java.lang.Thread.run(Thread.java:745) [na:1.8.0_73]
> ERROR [SharedPool-Worker-1] 2016-09-23 09:42:56,238 Message.java:611 - 
> Unexpected exception during request; channel = [id: 0x8e2eae00, 
> L:/IP1.IP2.IP3.IP4:9042 - R:/IP5.IP6.IP7.IP8:58421]
> java.lang.NullPointerException: null
>     at 
> org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:33)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.serializers.BooleanSerializer.deserialize(BooleanSerializer.java:24)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.db.marshal.AbstractType.compose(AbstractType.java:113) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.cql3.UntypedResultSet$Row.getBoolean(UntypedResultSet.java:273)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:85)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager$1.apply(CassandraRoleManager.java:81)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.getRoleFromTable(CassandraRoleManager.java:503)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.getRole(CassandraRoleManager.java:485)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.auth.CassandraRoleManager.canLogin(CassandraRoleManager.java:298)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at org.apache.cassandra.service.ClientState.login(ClientState.java:227) 
> ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.messages.AuthResponse.execute(AuthResponse.java:79)
>  ~[apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:507)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:401)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at 
> io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283)
>  [netty-all-4.0.36.Final.jar:4.0.36.Final]
>     at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> [na:1.8.0_73]
>     at 
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
>  [apache-cassandra-3.7.0.jar:3.7.0]
>     at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) 
> [apache-cassandra-3.7.0.jar:3.7.0]
>     at java.lang.Thread.run(Thread.java:745) [na:1.8.0_73]
> {code}
> {code:title=python client error}
> Traceback (most recent call last):
>  File "vssandra_v5.py", line 132, in <module>
>    db.insert_batch()
>  File "vssandra_v5.py", line 60, in insert_batch
>    self.session.execute(self.batch, timeout=None)
>  File "cassandra/cluster.py", line 1998, in cassandra.cluster.Session.execute 
> (cassandra/cluster.c:34869)
>  File "cassandra/cluster.py", line 3781, in 
> cassandra.cluster.ResponseFuture.result (cassandra/cluster.c:73073)
> cassandra.protocol.ServerError: <Error from server: code=0000 [Server error] 
> message="com.google.common.util.concurrent.UncheckedExecutionException: 
> com.google.common.util.concurrent.UncheckedExecutionException: 
> java.lang.NullPointerException">
> {code}
> {code:title=cassandra config}
>  Node configuration:[allocate_tokens_for_keyspace=null; 
> authenticator=PasswordAuthenticator; authorizer=CassandraAuthorizer; 
> auto_bootstrap=true; auto_snapshot=true; batch_size_fail_threshold_in_kb=100; 
> batch_size_warn_threshold_in_kb=10; batchlog_replay_throttle_in_kb=1024; 
> broadcast_address=null; broadcast_rpc_address=null; 
> buffer_pool_use_heap_if_exhausted=true; cas_contention_timeout_in_ms=5000; 
> client_encryption_options=<REDACTED>; cluster_name=VCF Stress Cluster; 
> column_index_cache_size_in_kb=2; column_index_size_in_kb=64; 
> commit_failure_policy=stop; commitlog_compression=null; 
> commitlog_directory=null; commitlog_max_compression_buffers_in_pool=3; 
> commitlog_periodic_queue_size=-1; commitlog_segment_size_in_mb=32; 
> commitlog_sync=periodic; commitlog_sync_batch_window_in_ms=null; 
> commitlog_sync_period_in_ms=10000; commitlog_total_space_in_mb=null; 
> compaction_large_partition_warning_threshold_mb=150; 
> compaction_throughput_mb_per_sec=20; concurrent_compactors=null; 
> concurrent_counter_writes=32; concurrent_materialized_view_writes=32; 
> concurrent_reads=32; concurrent_replicates=null; concurrent_writes=32; 
> counter_cache_keys_to_save=2147483647; counter_cache_save_period=7200; 
> counter_cache_size_in_mb=null; counter_write_request_timeout_in_ms=5000; 
> credentials_cache_max_entries=1000; credentials_update_interval_in_ms=-1; 
> credentials_validity_in_ms=2000; cross_node_timeout=false; 
> data_file_directories=[Ljava.lang.String;@36fc695d; disk_access_mode=auto; 
> disk_failure_policy=stop; disk_optimization_estimate_percentile=0.95; 
> disk_optimization_page_cross_chance=0.1; disk_optimization_strategy=spinning; 
> dynamic_snitch=true; dynamic_snitch_badness_threshold=0.1; 
> dynamic_snitch_reset_interval_in_ms=600000; 
> dynamic_snitch_update_interval_in_ms=100; 
> enable_scripted_user_defined_functions=false; 
> enable_user_defined_functions=false; 
> enable_user_defined_functions_threads=true; encryption_options=null; 
> endpoint_snitch=SimpleSnitch; file_cache_size_in_mb=null; 
> gc_warn_threshold_in_ms=1000; hinted_handoff_disabled_datacenters=[]; 
> hinted_handoff_enabled=true; hinted_handoff_throttle_in_kb=1024; 
> hints_compression=null; hints_directory=null; hints_flush_period_in_ms=10000; 
> incremental_backups=false; index_interval=null; 
> index_summary_capacity_in_mb=null; 
> index_summary_resize_interval_in_minutes=60; initial_token=null; 
> inter_dc_stream_throughput_outbound_megabits_per_sec=200; 
> inter_dc_tcp_nodelay=false; internode_authenticator=null; 
> internode_compression=dc; internode_recv_buff_size_in_bytes=null; 
> internode_send_buff_size_in_bytes=null; key_cache_keys_to_save=2147483647; 
> key_cache_save_period=14400; key_cache_size_in_mb=null; 
> listen_address=IP.251; listen_interface=null; 
> listen_interface_prefer_ipv6=false; listen_on_broadcast_address=false; 
> max_hint_window_in_ms=10800000; max_hints_delivery_threads=2; 
> max_hints_file_size_in_mb=128; max_mutation_size_in_kb=null; 
> max_streaming_retries=3; max_value_size_in_mb=256; 
> memtable_allocation_type=offheap_objects; memtable_cleanup_threshold=null; 
> memtable_flush_writers=1; memtable_heap_space_in_mb=null; 
> memtable_offheap_space_in_mb=null; 
> native_transport_max_concurrent_connections=-1; 
> native_transport_max_concurrent_connections_per_ip=-1; 
> native_transport_max_frame_size_in_mb=256; native_transport_max_threads=128; 
> native_transport_port=9042; native_transport_port_ssl=null; num_tokens=256; 
> otc_coalescing_strategy=TIMEHORIZON; otc_coalescing_window_us=200; 
> partitioner=org.apache.cassandra.dht.Murmur3Partitioner; 
> permissions_cache_max_entries=1000; permissions_update_interval_in_ms=-1; 
> permissions_validity_in_ms=2000; phi_convict_threshold=8.0; 
> prepared_statements_cache_size_mb=null; range_request_timeout_in_ms=11000; 
> read_request_timeout_in_ms=6000; 
> request_scheduler=org.apache.cassandra.scheduler.NoScheduler; 
> request_scheduler_id=null; request_scheduler_options=null; 
> request_timeout_in_ms=20000; role_manager=CassandraRoleManager; 
> roles_cache_max_entries=1000; roles_update_interval_in_ms=-1; 
> roles_validity_in_ms=2000; 
> row_cache_class_name=org.apache.cassandra.cache.OHCProvider; 
> row_cache_keys_to_save=2147483647; row_cache_save_period=0; 
> row_cache_size_in_mb=0; rpc_address=IP.251; rpc_interface=null; 
> rpc_interface_prefer_ipv6=false; rpc_keepalive=true; rpc_listen_backlog=50; 
> rpc_max_threads=2147483647; rpc_min_threads=16; rpc_port=9160; 
> rpc_recv_buff_size_in_bytes=null; rpc_send_buff_size_in_bytes=null; 
> rpc_server_type=sync; saved_caches_directory=null; 
> seed_provider=org.apache.cassandra.locator.SimpleSeedProvider{seeds=IP.251}; 
> server_encryption_options=<REDACTED>; snapshot_before_compaction=false; 
> ssl_storage_port=7001; sstable_preemptive_open_interval_in_mb=50; 
> start_native_transport=true; start_rpc=false; storage_port=7000; 
> stream_throughput_outbound_megabits_per_sec=250; 
> streaming_socket_timeout_in_ms=86400000; 
> thrift_framed_transport_size_in_mb=15; thrift_max_message_length_in_mb=16; 
> thrift_prepared_statements_cache_size_mb=null; 
> tombstone_failure_threshold=100000; tombstone_warn_threshold=1000; 
> tracetype_query_ttl=86400; tracetype_repair_ttl=604800; 
> transparent_data_encryption_options=org.apache.cassandra.config.TransparentDataEncryptionOptions@28701274;
>  trickle_fsync=false; trickle_fsync_interval_in_kb=10240; 
> truncate_request_timeout_in_ms=60000; 
> unlogged_batch_across_partitions_warn_threshold=10; 
> user_defined_function_fail_timeout=1500; 
> user_defined_function_warn_timeout=500; user_function_timeout_policy=die; 
> windows_timer_interval=1; write_request_timeout_in_ms=10000]
> {code}



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