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https://issues.apache.org/jira/browse/CASSANDRA-13265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ariel Weisberg updated CASSANDRA-13265:
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Attachment: cassandra-13265-trun-dtest_stdout.txt
cassandra-13265-2.2-dtest_stdout.txt
trunk
{noformat}
Test Result (12 failures / +2)
auth_test.TestAuth.system_auth_ks_is_alterable_test
bootstrap_test.TestBootstrap.decommissioned_wiped_node_can_join_test
paging_test.TestPagingWithDeletions.test_ttl_deletions
repair_tests.incremental_repair_test.TestIncRepair.sstable_repairedset_test
repair_tests.incremental_repair_test.TestIncRepair.sstable_repairedset_test
snapshot_test.TestSnapshot.test_snapshot_and_restore_dropping_a_column
repair_tests.incremental_repair_test.TestIncRepair.multiple_full_repairs_lcs_test
repair_tests.incremental_repair_test.TestIncRepair.multiple_full_repairs_lcs_test
sstableutil_test.SSTableUtilTest.compaction_test
topology_test.TestTopology.size_estimates_multidc_test
topology_test.TestTopology.size_estimates_multidc_test
bootstrap_test.TestBootstrap.simultaneous_bootstrap_test
{noformat}
2.2
{noformat}
Test Result (4 failures / -8)
batch_test.TestBatch.logged_batch_throws_uae_test
snapshot_test.TestSnapshot.test_snapshot_and_restore_dropping_a_column
topology_test.TestTopology.size_estimates_multidc_test
bootstrap_test.TestBootstrap.simultaneous_bootstrap_test
{noformat}
> Expiration in OutboundTcpConnection can block the reader Thread
> ---------------------------------------------------------------
>
> Key: CASSANDRA-13265
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13265
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra 3.0.9
> Java HotSpot(TM) 64-Bit Server VM version 25.112-b15 (Java version
> 1.8.0_112-b15)
> Linux 3.16
> Reporter: Christian Esken
> Assignee: Christian Esken
> Fix For: 3.0.x
>
> Attachments: cassandra-13265-2.2-dtest_stdout.txt,
> cassandra-13265-trun-dtest_stdout.txt,
> cassandra.pb-cache4-dus.2017-02-17-19-36-26.chist.xz,
> cassandra.pb-cache4-dus.2017-02-17-19-36-26.td.xz
>
>
> I observed that sometimes a single node in a Cassandra cluster fails to
> communicate to the other nodes. This can happen at any time, during peak load
> or low load. Restarting that single node from the cluster fixes the issue.
> Before going in to details, I want to state that I have analyzed the
> situation and am already developing a possible fix. Here is the analysis so
> far:
> - A Threaddump in this situation showed 324 Threads in the
> OutboundTcpConnection class that want to lock the backlog queue for doing
> expiration.
> - A class histogram shows 262508 instances of
> OutboundTcpConnection$QueuedMessage.
> What is the effect of it? As soon as the Cassandra node has reached a certain
> amount of queued messages, it starts thrashing itself to death. Each of the
> Thread fully locks the Queue for reading and writing by calling
> iterator.next(), making the situation worse and worse.
> - Writing: Only after 262508 locking operation it can progress with actually
> writing to the Queue.
> - Reading: Is also blocked, as 324 Threads try to do iterator.next(), and
> fully lock the Queue
> This means: Writing blocks the Queue for reading, and readers might even be
> starved which makes the situation even worse.
> -----
> The setup is:
> - 3-node cluster
> - replication factor 2
> - Consistency LOCAL_ONE
> - No remote DC's
> - high write throughput (100000 INSERT statements per second and more during
> peak times).
>
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