Examples with DistributedBarrier org.apache.curator.framework.recipes.barriers.DistributedBarrier used on opensource projects

Example 1 with DistributedBarrier

use of org.apache.curator.framework.recipes.barriers.DistributedBarrier in project coprhd-controller by CoprHD.

the class DisasterRecoveryService method doSwitchover.

/**
 * Do Site Switchover
 * This API will do switchover to target new active site according passed in site UUID. After failover, old active site will
 * work as normal standby site and target site will be promoted to active. All site will update properties to trigger reconfig.
 *
 * @param uuid target new active site UUID
 * @brief Do site switchover
 * @return return accepted response if operation is successful
 */
@POST
@Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
@Path("/{uuid}/switchover")
@CheckPermission(roles = { Role.SECURITY_ADMIN, Role.RESTRICTED_SECURITY_ADMIN }, blockProxies = true)
public Response doSwitchover(@PathParam("uuid") String uuid) {
    log.info("Begin to switchover for standby UUID {}", uuid);
    precheckForSwitchoverForActiveSite(uuid);
    List<Site> allStandbySites = drUtil.listStandbySites();
    for (Site site : allStandbySites) {
        if (!site.getUuid().equals(uuid) && site.getState() == SiteState.STANDBY_PAUSED) {
            try (InternalSiteServiceClient client = new InternalSiteServiceClient(site)) {
                client.setCoordinatorClient(coordinator);
                client.setKeyGenerator(apiSignatureGenerator);
                client.switchoverPrecheck();
            }
        }
    }
    String oldActiveUUID = drUtil.getActiveSite().getUuid();
    InterProcessLock lock = drUtil.getDROperationLock();
    Site newActiveSite = null;
    Site oldActiveSite = null;
    try {
        newActiveSite = drUtil.getSiteFromLocalVdc(uuid);
        // Set old active site's state, short id and key
        oldActiveSite = drUtil.getSiteFromLocalVdc(oldActiveUUID);
        if (StringUtils.isEmpty(oldActiveSite.getSiteShortId())) {
            oldActiveSite.setSiteShortId(newActiveSite.getVdcShortId());
        }
        coordinator.startTransaction();
        oldActiveSite.setState(SiteState.ACTIVE_SWITCHING_OVER);
        coordinator.persistServiceConfiguration(oldActiveSite.toConfiguration());
        // this barrier is set when begin switchover and will be removed by new active site. Old active site will wait and reboot after
        // barrier is removed
        DistributedBarrier restartBarrier = coordinator.getDistributedBarrier(String.format("%s/%s/%s", ZkPath.SITES, oldActiveSite.getUuid(), Constants.SWITCHOVER_BARRIER_RESTART));
        restartBarrier.setBarrier();
        drUtil.recordDrOperationStatus(oldActiveSite.getUuid(), InterState.SWITCHINGOVER_ACTIVE);
        // trigger reconfig
        // a version for all sites.
        long vdcConfigVersion = DrUtil.newVdcConfigVersion();
        for (Site eachSite : drUtil.listSites()) {
            if (!eachSite.getUuid().equals(uuid) && eachSite.getState() == SiteState.STANDBY_PAUSED) {
                try (InternalSiteServiceClient client = new InternalSiteServiceClient(eachSite)) {
                    client.setCoordinatorClient(coordinator);
                    client.setKeyGenerator(apiSignatureGenerator);
                    client.switchover(newActiveSite.getUuid(), vdcConfigVersion);
                }
            } else {
                drUtil.updateVdcTargetVersion(eachSite.getUuid(), SiteInfo.DR_OP_SWITCHOVER, vdcConfigVersion, oldActiveSite.getUuid(), newActiveSite.getUuid());
            }
        }
        coordinator.commitTransaction();
        auditDisasterRecoveryOps(OperationTypeEnum.SWITCHOVER, AuditLogManager.AUDITLOG_SUCCESS, AuditLogManager.AUDITOP_BEGIN, oldActiveSite.toBriefString(), newActiveSite.toBriefString());
        return Response.status(Response.Status.ACCEPTED).build();
    } catch (Exception e) {
        log.error(String.format("Error happened when switchover from site %s to site %s", oldActiveUUID, uuid), e);
        coordinator.discardTransaction();
        auditDisasterRecoveryOps(OperationTypeEnum.SWITCHOVER, AuditLogManager.AUDITLOG_FAILURE, null, newActiveSite.getName(), newActiveSite.getVipEndPoint());
        throw APIException.internalServerErrors.switchoverFailed(oldActiveSite.getName(), newActiveSite.getName(), e.getMessage());
    } finally {
        try {
            lock.release();
        } catch (Exception ignore) {
            log.error(String.format("Lock release failed when switchover from %s to %s", oldActiveUUID, uuid));
        }
    }
}