1. 25 Jan, 2016 6 commits
    • antirez's avatar
      More variadic MIGRATE fixes. · 29c89df4
      antirez authored
      Another leak was fixed in the case of syntax error by restructuring the
      allocation strategy for the two dynamic vectors.
      
      We also make sure to always close the cached socket on I/O errors so that
      all the I/O errors are handled the same, even if we had a previously
      queued error of a different kind from the destination server.
      
      Thanks to Kevin McGehee. Related to issue #3016.
      29c89df4
    • antirez's avatar
      Various fixes to MIGRATE with multiple keys. · 14e15996
      antirez authored
      In issue #3016 Kevin McGehee identified multiple very serious issues in
      the new implementation of MIGRATE. This commit attempts to restructure
      the code in oder to avoid mistakes, an analysis of the new
      implementation is in progress in order to check for possible edge cases.
      14e15996
    • antirez's avatar
      Cluster: fix setting nodes slaveof pointer to NULL on node release. · 515392c2
      antirez authored
      With this commit we preserve the list of nodes that have .slaveof set
      to the node, even when the node is turned into a slave, and make sure to
      fix the .slaveof pointers to NULL when a node is freed from memory,
      regardless of the fact it's a slave or a master.
      
      Basically we try to remember the logical master in the current
      configuration even if the logical master advertised it as a slave
      already. However we still remember the associations, so that when a node
      is freed we can fix them.
      
      This should fix issue #3002.
      515392c2
    • antirez's avatar
      CLUSTER BUMPEPOCH initial implementation fixed. · 49b1e788
      antirez authored
      49b1e788
    • antirez's avatar
      Cluster: CLUSTER BUMPEPOCH introduced to help redis-trib fix. · 8ef716d1
      antirez authored
      Sometimes during "fixes" we have to setup a new configuration and assign
      slots to nodes. With BUMPEPOCH we can make sure the new configuration of
      the node will win if there are conflicting configurations (for example
      another node is *also* claiming the same slot because the cluster is
      totally messed up).
      8ef716d1
    • antirez's avatar
      5da1e640
  2. 19 Jan, 2016 1 commit
  3. 08 Jan, 2016 2 commits
  4. 06 Jan, 2016 1 commit
    • antirez's avatar
      Cluster: don't send -ASK to MIGRATE. · 319a4c04
      antirez authored
      For non existing keys, we don't want to send -ASK redirections to
      MIGRATE, since when moving slots from the migrating node to the
      importing node, we want just to ignore keys that are no longer there.
      They may be expired or deleted between the GETKEYSINSLOT call and the
      MIGRATE call. Otherwise this causes an error during migrations with
      redis-trib (or equivalent cluster management tools).
      319a4c04
  5. 18 Dec, 2015 1 commit
  6. 13 Dec, 2015 3 commits
  7. 11 Dec, 2015 1 commit
    • antirez's avatar
      Cluster: replica migration with delay. · bf09e58d
      antirez authored
      We wait a fixed amount of time (5 seconds currently) much greater than
      the usual Cluster node to node communication latency, before migrating.
      This way when a failover occurs, before detecting the new master as a
      target for migration, we give the time to its natural slaves (the slaves
      of the failed over master) to announce they switched to the new master,
      preventing an useless migration operation.
      bf09e58d
  8. 10 Dec, 2015 3 commits
    • antirez's avatar
      Fix merge of cluster migrate-to flag. · 711bf140
      antirez authored
      711bf140
    • antirez's avatar
      Remove debugging message left there for error. · 6d5d8d10
      antirez authored
      6d5d8d10
    • antirez's avatar
      Fix replicas migration by adding a new flag. · 2e43bcff
      antirez authored
      Some time ago I broken replicas migration (reported in #2924).
      The idea was to prevent masters without replicas from getting replicas
      because of replica migration, I remember it to create issues with tests,
      but there is no clue in the commit message about why it was so
      undesirable.
      
      However my patch as a side effect totally ruined the concept of replicas
      migration since we want it to work also for instances that, technically,
      never had slaves in the past: promoted slaves.
      
      So now instead the ability to be targeted by replicas migration, is a
      new flag "migrate-to". It only applies to masters, and is set in the
      following two cases:
      
      1. When a master gets a slave, it is set.
      2. When a slave turns into a master because of fail over, it is set.
      
      This way replicas migration targets are only masters that used to have
      slaves, and slaves of masters (that used to have slaves... obviously)
      and are promoted.
      
      The new flag is only internal, and is never exposed in the output nor
      persisted in the nodes configuration, since all the information to
      handle it are implicit in the cluster configuration we already have.
      2e43bcff
  9. 27 Nov, 2015 2 commits
  10. 17 Jul, 2015 1 commit
  11. 11 Jun, 2015 1 commit
  12. 24 Mar, 2015 1 commit
    • antirez's avatar
      Cluster: redirection refactoring + handling of blocked clients. · 3468cd36
      antirez authored
      There was a bug in Redis Cluster caused by clients blocked in a blocking
      list pop operation, for keys no longer handled by the instance, or
      in a condition where the cluster became down after the client blocked.
      
      A typical situation is:
      
      1) BLPOP <somekey> 0
      2) <somekey> hash slot is resharded to another master.
      
      The client will block forever int this case.
      
      A symmentrical non-cluster-specific bug happens when an instance is
      turned from master to slave. In that case it is more serious since this
      will desynchronize data between slaves and masters. This other bug was
      discovered as a side effect of thinking about the bug explained and
      fixed in this commit, but will be fixed in a separated commit.
      3468cd36
  13. 21 Mar, 2015 5 commits
  14. 20 Mar, 2015 1 commit
    • antirez's avatar
      Cluster: better cluster state transiction handling. · 62893f5b
      antirez authored
      Before we relied on the global cluster state to make sure all the hash
      slots are linked to some node, when getNodeByQuery() is called. So
      finding the hash slot unbound was checked with an assertion. However
      this is fragile. The cluster state is often updated in the
      clusterBeforeSleep() function, and not ASAP on state change, so it may
      happen to process clients with a cluster state that is 'ok' but yet
      certain hash slots set to NULL.
      
      With this commit the condition is also checked in getNodeByQuery() and
      reported with a identical error code of -CLUSTERDOWN but slightly
      different error message so that we have more debugging clue in the
      future.
      
      Root cause of issue #2288.
      62893f5b
  15. 18 Mar, 2015 2 commits
  16. 27 Feb, 2015 1 commit
  17. 26 Feb, 2015 1 commit
    • antirez's avatar
      Improvements to PR #2425 · 53659404
      antirez authored
      1. Remove useless "cs" initialization.
      2. Add a "select" var to capture a condition checked multiple times.
      3. Avoid duplication of the same if (!copy) conditional.
      4. Don't increment dirty if copy is given (no deletion is performed),
         otherwise we propagate MIGRATE when not needed.
      53659404
  18. 25 Feb, 2015 1 commit
  19. 30 Jan, 2015 2 commits
  20. 29 Jan, 2015 4 commits