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yeshuangshuang commented on ZOOKEEPER-3211: ------------------------------------------- [~eolivelli] please check the newly log “zookeeper.log”。 2019-09-16 04:01:59,457 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,457 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,459 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,461 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,461 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,461 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,463 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 2019-09-16 04:01:59,463 [myid:] - WARN [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2900:NIOServerCnxnFactory@193] - Too many connections from /127.0.0.1 - max is 60 > zookeeper standalone mode,found a high level bug in kernel of centos7.0 > ,zookeeper Server's tcp/ip socket connections(default 60 ) are CLOSE_WAIT > ,this lead to zk can't work for client any more > -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > Key: ZOOKEEPER-3211 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3211 > Project: ZooKeeper > Issue Type: Bug > Components: server > Affects Versions: 3.4.5 > Environment: 1.zoo.cfg > server.1=127.0.0.1:2902:2903 > 2.kernel > kernel:Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Tue Feb 12 > 19:44:50 EST 2019 x86_64 x86_64 x86_64 GNU/Linux > JDK: > java version "1.7.0_181" > OpenJDK Runtime Environment (rhel-2.6.14.5.el7-x86_64 u181-b00) > OpenJDK 64-Bit Server VM (build 24.181-b00, mixed mode) > zk: 3.4.5 > Reporter: yeshuangshuang > Priority: Blocker > Fix For: 3.4.5 > > Attachments: 1.log, 2018-12-09_124131.png, 2018-12-09_124210.png, > 2018-12-09_132854.png, 2018-12-09_133017.png, 2018-12-09_133049.png, > 2018-12-09_133111.png, 2018-12-09_133131.png, 2018-12-09_133150.png, > 2018-12-09_133210.png, 2018-12-09_133229.png, 2018-12-09_133248.png, > 2018-12-09_133320.png, zookeeper.log > > Original Estimate: 168h > Remaining Estimate: 168h > > 1.config--zoo.cfg > server.1=127.0.0.1:2902:2903 > 2.kernel version > version:Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Tue Feb 12 > 19:44:50 EST 2019 x86_64 x86_64 x86_64 GNU/Linux > JDK: > java version "1.7.0_181" > OpenJDK Runtime Environment (rhel-2.6.14.5.el7-x86_64 u181-b00) > OpenJDK 64-Bit Server VM (build 24.181-b00, mixed mode) > zk: 3.4.5 > 3.bug details: > Occasionally,But the recurrence probability is extremely high. At first, the > read-write timeout takes about 6s, and after a few minutes, all connections > (including long ones) will be CLOSE_WAIT state. > 4.:Circumvention scheme: it is found that all connections become close_wait > to restart the zookeeper server side actively -- This message was sent by Atlassian Jira (v8.3.2#803003)