Previously Sentinels always changed unique ID across restarts, relying
on the server.runid field. This is not a good idea, and forced Sentinel
to rely on detection of duplicated Sentinels and a potentially dangerous
clean-up and re-add operation of the Sentinel instance that was
rebooted.
Now the ID is generated at the first start and persisted in the
configuration file, so that a given Sentinel will have its unique
ID forever (unless the configuration is manually deleted or there is a
filesystem corruption).
Originally, only the +slave event which occurs when a slave is
reconfigured during sentinelResetMasterAndChangeAddress triggers a flush
of the config to disk. However, newly discovered slaves don't
apparently trigger this flush but do trigger the +slave event issuance.
So if you start up a sentinel, add a master, then add a slave to the
master (as a way to reproduce it) you'll see the +slave event issued,
but the sentinel config won't be updated with the known-slave entry.
This change makes sentinel do the flush of the config if a new slave is
deteted in sentinelRefreshInstanceInfo.
Originally, only the +slave event which occurs when a slave is
reconfigured during sentinelResetMasterAndChangeAddress triggers a flush
of the config to disk. However, newly discovered slaves don't
apparently trigger this flush but do trigger the +slave event issuance.
So if you start up a sentinel, add a master, then add a slave to the
master (as a way to reproduce it) you'll see the +slave event issued,
but the sentinel config won't be updated with the known-slave entry.
This change makes sentinel do the flush of the config if a new slave is
deteted in sentinelRefreshInstanceInfo.
To rewrite the config in the loop that adds slaves back after a master
reset, in order to handle switching to another master, is useless: it
just adds latency since there is an fsync call in the inner loop,
without providing any additional guarantee, but the contrary, since if
after the first loop iteration the server crashes we end with just a
single slave entry losing all the other informations.
It is wiser to rewrite the config at the end when the full new
state is configured.
To rewrite the config in the loop that adds slaves back after a master
reset, in order to handle switching to another master, is useless: it
just adds latency since there is an fsync call in the inner loop,
without providing any additional guarantee, but the contrary, since if
after the first loop iteration the server crashes we end with just a
single slave entry losing all the other informations.
It is wiser to rewrite the config at the end when the full new
state is configured.
When we fail to setup the write handler it does not make sense to take
the client around, it is missing writes: whatever is a client or a slave
anyway the connection should terminated ASAP.
Moreover what the function does exactly with its return value, and in
which case the write handler is installed on the socket, was not clear,
so the functions comment are improved to make the goals of the function
more obvious.
Also related to #2485.
When we fail to setup the write handler it does not make sense to take
the client around, it is missing writes: whatever is a client or a slave
anyway the connection should terminated ASAP.
Moreover what the function does exactly with its return value, and in
which case the write handler is installed on the socket, was not clear,
so the functions comment are improved to make the goals of the function
more obvious.
Also related to #2485.
master was closing the connection if the RDB transfer took long time.
and also sent PINGs to the slave before it got the initial ACK, in which case the slave wouldn't be able to find the EOF marker.
master was closing the connection if the RDB transfer took long time.
and also sent PINGs to the slave before it got the initial ACK, in which case the slave wouldn't be able to find the EOF marker.
Segfault introduced during a refactoring / warning suppression a few
commits away. This particular call assumed that it is safe to pass NULL
to the object pointer argument when we are sure the set has a given
encoding. This can't be assumed and is now guaranteed to segfault
because of the new API of setTypeNext().
Segfault introduced during a refactoring / warning suppression a few
commits away. This particular call assumed that it is safe to pass NULL
to the object pointer argument when we are sure the set has a given
encoding. This can't be assumed and is now guaranteed to segfault
because of the new API of setTypeNext().
This change fixes several warnings compiling at -O3 level with GCC
4.8.2, and at the same time, in case of misuse of the API, we have the
pointer initialize to NULL or the integer initialized to the value
-123456789 which is easy to spot by naked eye.
This change fixes several warnings compiling at -O3 level with GCC
4.8.2, and at the same time, in case of misuse of the API, we have the
pointer initialize to NULL or the integer initialized to the value
-123456789 which is easy to spot by naked eye.
No semantical changes since to make dict.c truly able to scale over the
32 bit table size limit, the hash function shoulds and other internals
related to hash function output should be 64 bit ready.
