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Replication & HA interview questions

15 real Replication & HA questions from the Redis bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is Leader-replica replication?

Junior
  1. A.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  2. B.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
  3. C.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  4. D.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
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3. Which statement is correct?

Junior
  1. A.Leader-replica replication — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
  2. B.Leader-replica replication — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  3. C.Leader-replica replication — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  4. D.Leader-replica replication — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
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4. What is Sentinel?

Mid
  1. A.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  2. B.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  3. C.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
  4. D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
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5. Which term means: "a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically"?

Mid
  1. A.Sentinel
  2. B.Quorum
  3. C.Partial resynchronization
  4. D.Leader-replica replication
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6. Which statement is correct?

Mid
  1. A.Sentinel — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  2. B.Sentinel — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
  3. C.Sentinel — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  4. D.Sentinel — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
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7. What is Automatic failover?

Mid
  1. A.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
  2. B.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  3. C.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
  4. D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
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8. Which term means: "the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability"?

Mid
  1. A.Quorum
  2. B.Partial resynchronization
  3. C.Sentinel
  4. D.Automatic failover
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9. Which statement is correct?

Mid
  1. A.Automatic failover — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  2. B.Automatic failover — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
  3. C.Automatic failover — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  4. D.Automatic failover — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
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10. What is Quorum?

Senior
  1. A.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  2. B.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  3. C.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  4. D.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
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11. Which term means: "the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized"?

Senior
  1. A.Automatic failover
  2. B.Sentinel
  3. C.Partial resynchronization
  4. D.Quorum
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12. Which statement is correct?

Senior
  1. A.Quorum — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  2. B.Quorum — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
  3. C.Quorum — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  4. D.Quorum — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
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13. What is Partial resynchronization?

Senior
  1. A.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
  2. B.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  3. C.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
  4. D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
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14. Which term means: "resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy"?

Senior
  1. A.Partial resynchronization
  2. B.Quorum
  3. C.Automatic failover
  4. D.Leader-replica replication
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15. Which statement is correct?

Senior
  1. A.Partial resynchronization — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
  2. B.Partial resynchronization — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
  3. C.Partial resynchronization — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
  4. D.Partial resynchronization — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
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