Commit ba7bf254 authored by David Auer's avatar David Auer
Browse files

Automatic relocation on startup

parent aed0771f

include/config.hpp

+12 −1
Original line number Diff line number Diff line
@@ -24,12 +24,23 @@ namespace gkfs::config { 


constexpr auto hostfile_path = "./gkfs_hosts.txt";

constexpr auto forwarding_file_path = "./gkfs_forwarding.map";



/*

 * Enables adding/removing daemons to the running file system and

 * switches distribution function to Random Slicing.

 * switches distribution algorithm to Random Slicing.

 */

constexpr auto dynamic_placement = true;



/*

 * Only effective with dynamic_placement = true:

 * Trigger reconfiguration and relocation after regular daemon startup. Useful

 * for CI runs. Each newly started daemon automatically adds itself to the

 * cluster.

 * TODO: Also relocate during extra graceful shutdown. (i.e. remove myself from

 * cluster)

 */

constexpr auto auto_relocate = true;



namespace io {

/*

 * Zero buffer before read. This is relevant if sparse files are used.

src/daemon/daemon.cpp

+4 −0
Original line number Diff line number Diff line
@@ -631,6 +631,10 @@ main(int argc, const char* argv[]) { 
    signal(SIGTERM, shutdown_handler);

    signal(SIGKILL, shutdown_handler);



    if(gkfs::config::dynamic_placement && gkfs::config::auto_relocate) {

        auto trigger_hosts = gkfs::relocation::calculate_random_slicing();

        gkfs::relocation::do_relocation(trigger_hosts);

    }



    unique_lock<mutex> lk(mtx);

    // Wait for shutdown signal to initiate shutdown protocols