erlang - why lager design this way? -


When I use leगर I get a problem. In the leaguer source code, the lager_backend_throttle.erl file 

  handle_event ({log, _Message}, state) - & gt; {message_queue_len, Len} = erlang: process_info (self (), message_queue_len), case {le & gt; State # state.hwm, state # state.async} {true, true} -> gt; %% need to flip in sync mode lager_config: set (async, false), {ok, state # state {async = false}}; {False, false} - & gt; %% need to flip on Async mode lager_config: set (async, true), {ok, State # state {async = true}}; _ - & gt; There is no need to change anything at the end of {well, state};   
 When message_queue_len is over thresholds, it will flip in sync mode.  
 When message_queue_len is less than Thershold, it will flip in async mode.  
 I think that when there is a lot of message, then this message should be converted to Async so that the message can be processed more quickly soon. Why laser designs this way?  
 I think the reason is message length in the message_queue, if there are too many messages, then the process may crash, then changing the sending sender mode reduces the speed of sending the message?   
 
 
 I got the answer on the gitub.  
 Prior to Ligar 2.0, the gene_evolution on the core of large is fully operated in synchronous mode. Asynchronous mode is fast, but there is no security against message queue overload. In Liger 2.0, gen_event takes a hybrid approach. It toggles its mailbox size between synchronous and asynchronous messages based on the size of the mailbox and will use async messaging until the mailbox has more than 20 messages. {async_threshold, 20}, async_threshold_window, 5} the point at which synchronous messages will be used, and switch back to Asynchronous, when size decreases to 20 - 5 = 15.  
 If you want to disable this behavior, set it to 'Undefined', it misses the mailbox faster than the limit and misses a small number to prevent problems from being created. In general, Larjar should fast as fast as he should in messages, so behind 20 should be relatively extraordinary.  
 If you want to limit the number of messages per second permitted by error_logger, which is a good idea, if you want to weather the flood of messages when you crash many related processes, then you You can set a limit:  
 {error_logger_hwm, 50} It's probably best to keep this number short.

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more