Switch (vDS) Health Check 354 Next Steps 355 Setting Up VMware vSphere DRS and HA 355 Enabling DRS 355 Enabling HA 356 Next Steps 359 Setting Up VMware vSphere Storage 359 Configuring vSAN 359 Upgrading the Service 386 Removing the Deprecated HA Service 386 Removing HA Service for a Cluster with a Single Segment per Segment Host 387 Removing HA Service for a Cluster with a Multiple Segments per Installing the Postmaster Service 388 Managing Single Host Failures in VMware vSphere 388 How DRS and HA protect a running Greenplum cluster 389 Single Host Failure Scenarios 389 Mirror Segment Failure

Switch (vDS) Health Check 337 Next Steps 338 Setting Up VMware vSphere DRS and HA 338 Enabling DRS 338 Enabling HA 339 Next Steps 342 Setting Up VMware vSphere Storage 342 Configuring vSAN 342 Cluster Connection Information 366 Managing Single Host Failures in VMware vSphere 366 How DRS and HA protect a running Greenplum cluster 367 Single Host Failure Scenarios 367 VMware Greenplum 6 Documentation Standby Master Failure 369 Master Failure 370 After Host Recovery 370 Best Practices for Greenplum HA 371 Appendix: Grace Period for a Downed Segment 371 Planning Downtime for Maintenance 371 Bringing

Switch (vDS) Health Check 318 Next Steps 319 Setting Up VMware vSphere DRS and HA 319 Enabling DRS 319 Enabling HA 320 Next Steps 323 Setting Up VMware vSphere Storage 323 Configuring vSAN 323 Validating the Greenplum Installation 394 Managing Single Host Failures in VMware vSphere 395 How DRS and HA protect a running Greenplum cluster 395 Single Host Failure Scenarios 396 Mirror Segment Failure Standby Master Failure 397 Master Failure 398 After Host Recovery 399 Best Practices for Greenplum HA 399 Appendix: Grace Period for a Downed Segment 399 Planning Downtime for Maintenance 400 Bringing

Switch (vDS) Health Check 275 Next Steps 276 Setting Up VMware vSphere DRS and HA 276 Enabling DRS 276 Enabling HA 277 Next Steps 279 Setting Up VMware Vsphere Storage 280 Configuring vSAN 280 Validating the Greenplum Installation 322 Managing Single Host Failures in VMware vSphere 323 How DRS and HA protect a running Greenplum cluster 323 Single Host Failure Scenarios 324 Mirror Segment Failure Documentation VMware, Inc 14 Master Failure 326 After Host Recovery 326 Best Practices for Greenplum HA 326 Appendix: Grace Period for a Downed Segment 327 Planning Downtime for Maintenance 327 Bringing

Tanzu Greenplum 6 Documentation VMware, Inc 13 Setting Up VMware vSphere DRS and HA 308 Enabling DRS 309 Enabling HA 310 Next Steps 313 Setting Up VMware vSphere Storage 313 Configuring vSAN 313 Greenplum 6 Documentation VMware, Inc 15 Managing Single Host Failures in VMware vSphere 384 How DRS and HA protect a running Greenplum cluster 384 Single Host Failure Scenarios 385 Mirror Segment Failure Standby Master Failure 387 Master Failure 388 After Host Recovery 388 Best Practices for Greenplum HA 388 Appendix: Grace Period for a Downed Segment 389 Planning Downtime for Maintenance 389 Bringing

Switch (vDS) Health Check 303 Next Steps 304 Setting Up VMware vSphere DRS and HA 304 Enabling DRS 304 Enabling HA 305 Next Steps 308 Setting Up VMware vSphere Storage 308 Configuring vSAN 308 Validating the Greenplum Installation 381 Managing Single Host Failures in VMware vSphere 381 How DRS and HA protect a running Greenplum cluster 381 Single Host Failure Scenarios 382 Mirror Segment Failure Standby Master Failure 383 Master Failure 385 After Host Recovery 385 Best Practices for Greenplum HA 385 Appendix: Grace Period for a Downed Segment 386 Planning Downtime for Maintenance 386 Bringing

只负责生成和优化查询 计划、派发任务、协调数据节点进行并行计算。 按照我们在用户现场观察到的，Master 上的资源消耗很少有超过 20% 情况发生，因为 Segment 才是计算和加载发生的场所（当然， 在 HA 方面，Greenplum 提供 Standby Master 机制进行保证）。 再进一步看，Master-Slave 架构在业界的大数据分布式计算和云计 算体系中被广泛应用，大家可以看到，现在主流分布式系统都是采

system fails. For information about Greenplum Database mirroring schemes, see ../../best_practices/ha.html#topic_ngz_qf4_tt. For example, this is a gpexpand configuration file for a simple Greenplum system system fails. For information about Greenplum Database mirroring schemes, see ../../best_practices/ha.html#topic_ngz_qf4_tt. For this simple coordinator and segment instance configuration, the host system

all segments for this query, multiplied by 100. For example, a value of .95 is shown as 95. query_ha sh bigint Not implemented in this release. query_te xt text The SQL text of this query. query_pl

all segments for this query, multiplied by 100. For example, a value of .95 is shown as 95. query_ha sh bigint Not implemented in this release. query_te xt text The SQL text of this query. query_pl