You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@zookeeper.apache.org by happen <37...@qq.com> on 2020/08/16 14:12:34 UTC

no response for get children

&nbsp; Hi,&nbsp;


&nbsp; &nbsp; &nbsp; I found a&nbsp;strange thing in zk 3.5.6 that sometimes observers ignored one get children req (local session). thougth watch events still was sent to the c++  client. Then the client  waited the get children reponse for totally session timeout time and no ping could be sent to server until session expired.  The client said "invalid zk handle" after session expired.
     


     The issue's frequency situation: 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;A)&nbsp; 1 to 5&nbsp;get children requests are ignored per minute  when:  6000 client is connected to one observer, zk_packets_sent 2M/min,&nbsp;zk_packets_received 1M/min;
&nbsp; &nbsp; &nbsp; &nbsp;B) and less&nbsp;get children requests are ignored when lower zk_packets_sent and&nbsp;zk_packets_received.



     


     I caught packets for the journey, no one reponses for the ignored get children req when it occurred.


    Why  sometimes get children req.s were ignored ?  


    Is it possible a bug in zk3.5.6 ?

回复：no response for get children

Posted by happen <37...@qq.com>.
&nbsp; Hi,


&nbsp; &nbsp; &nbsp; I found a&nbsp;strange thing in zk 3.5.6 that sometimes observers ignored one get children req (local session). thougth other watch events could still be sent to the involved c++  client. Then the involved client  waited the get children reponse for totally session timeout time and no ping could be sent to observer until the session expired.  The client said "invalid zhandle state" after session expired.
     


     The issue's frequency situation: 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;A)&nbsp; 1 to 5&nbsp;get children requests are ignored per minute  when:  6000 client is connected to one observer, zk_packets_sent 2M/min,&nbsp;zk_packets_received 1M/min;
&nbsp; &nbsp; &nbsp; &nbsp;B) and less&nbsp;get children requests are ignored when lower zk_packets_sent and&nbsp;zk_packets_received.



     


     I caught packets for the journey, no one reponses for the ignored get children req when it occurred.


    Why  sometimes get children req.s were ignored ?  


    Is it possible a bug in zk3.5.6 ?





------------------&nbsp;原始邮件&nbsp;------------------
发件人:                                                                                                                        "happen"                                                                                    <370119764@qq.com&gt;;
发送时间:&nbsp;2020年8月16日(星期天) 晚上10:12
收件人:&nbsp;"dev"<dev@zookeeper.apache.org&gt;;

主题:&nbsp;no response for get children



&nbsp; Hi, 


&nbsp; &nbsp; &nbsp; I found a strange thing in zk 3.5.6 that sometimes observers ignored one get children req (local session). thougth watch events still was sent to the c++  client. Then the client  waited the get children reponse for totally session timeout time and no ping could be sent to server until session expired.  The client said "invalid zk handle" after session expired.
     


     The issue's frequency situation: 
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;A)&nbsp; 1 to 5 get children requests are ignored per minute  when:  6000 client is connected to one observer, zk_packets_sent 2M/min, zk_packets_received 1M/min;
&nbsp; &nbsp; &nbsp; &nbsp;B) and less get children requests are ignored when lower zk_packets_sent and zk_packets_received.



     


     I caught packets for the journey, no one reponses for the ignored get children req when it occurred.


    Why  sometimes get children req.s were ignored ?  


    Is it possible a bug in zk3.5.6 ?