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| -rw-r--r-- | 00-RELEASENOTES | 277 | ||||
| -rw-r--r-- | src/version.h | 2 |
2 files changed, 278 insertions, 1 deletions
diff --git a/00-RELEASENOTES b/00-RELEASENOTES index 7c5a75412..7ce88c556 100644 --- a/00-RELEASENOTES +++ b/00-RELEASENOTES @@ -12,6 +12,283 @@ SECURITY: There are security fixes in the release. -------------------------------------------------------------------------------- ================================================================================ +Redis 6.0.4 Released Thu May 28 11:36:45 CEST 2020 +================================================================================ + +Upgrade urgency CRITICAL: this release fixes a severe replication bug. + +Redis 6.0.4 fixes a critical replication bug caused by a new feature introduced +in Redis 6. The feature, called "meaningful offset" and strongly wanted by +myself (antirez) was an improvement that avoided that masters were no longer +able, during a failover where they were demoted to replicas, to partially +synchronize with the new master. In short the feature was able to avoid full +synchronizations with RDB. How did it work? By trimming the replication backlog +of the final "PING" commands the master was sending in the replication channel: +this way the replication offset would no longer go "after" the one of the +promoted replica, allowing the master to just continue in the same replication +history, receiving only a small data difference. + +However after the introduction of the feature we (the Redis core team) quickly +understood there was something wrong: the apparently harmless feature had +many bugs, and the last bug we discovered, after a joined effort of multiple +people, we were not even able to fully understand after fixing it. Enough was +enough, we decided that the complexity cost of this feature was too high. +So Redis 6.0.4 removes the feature entirely, and fixes the data corruption that +it was able to cause. + +However there are two facts to take in mind. + +Fact 1: Setups using chained replication, that means that certain replicas +are replicating from other replicas, up to Redis 6.0.3 can experience data +corruption. For chained replication we mean that: + + +--------+ +---------+ +-------------+ + | master |--------->| replica |-------->| sub-replica | + +--------+ +---------+ +-------------+ + + +People using chained replication SHOULD UPGRADE ASAP away from Redis 6.0.0, +6.0.1, 6.0.2 or 6.0.3 to Redis 6.0.4. + +To be clear, people NOT using this setup, but having just replicas attached +directly to the master, SHOUDL NOT BE in danger of any problem. But we +are no longer confident on 6.0.x replication implementation complexities +so we suggest to upgrade to 6.0.4 to everybody using an older 6.0.3 release. +We just so far didn't find any bug that affects Redis 6.0.3 that does not +involve chained replication. + +People starting with Redis 6.0.4 are fine. People with Redis 5 are fine. +People upgrading from Redis 5 to Redis 6.0.4 are fine. +TLDR: The problem is with users of 6.0.0, 6.0.1, 6.0.2, 6.0.3. + +Fact 2: Upgrading from Redis 6.0.x to Redis 6.0.4, IF AND ONLY IF you +use chained replication, requires some extra care: + +1. Once you attach your new Redis 6.0.4 instance as a replica of the current + Redis 6.0.x master, you should wait for the first full synchronization, + then you should promote it right away, if your setup involves chained + replication. Don't give it the time to do a new partial synchronization + in the case the link between the master and the replica will break in + the mean time. + +2. As an additional care, you may want to set the replication ping period + to a very large value (for instance 1000000) using the following command: + + CONFIG SET repl-ping-replica-period 1000000 + + Note that if you do "1" with care, "2" is not needed. + However if you do it, make sure to later restore it to its default: + + CONFIG SET repl-ping-replica-period 10 + +So this is the main change in Redis 6. Later we'll find a different way in +order to achieve what we wanted to achieve with the Meaningful Offset feature, +but without the same complexity. + +Other changes in this release: + +* PSYNC2 tests improved. +* Fix a rare active defrag edge case bug leading to stagnation +* Fix Redis 6 asserting at startup in 32 bit systems. +* Redis 6 32 bit is now added back to our testing environments. +* Fix server crash for STRALGO command, +* Implement sendfile for RDB transfer. +* TLS fixes. +* Make replication more resistant by disconnecting the master if we + detect a protocol error. Basically we no longer accept inline protocol + from the master. +* Other improvements in the tests. + +Regards, +antirez + +This is the full list of commits: + +antirez in commit 59cd4c9f6: + Test: take PSYNC2 test master timeout high during switch. + 1 file changed, 1 deletion(-) + +antirez in commit 6c1bb7b19: + Test: add the tracking unit as default. + 1 file changed, 1 insertion(+) + +Oran Agra in commit 1aee695e5: + tests: find_available_port start search from next port + 1 file changed, 12 insertions(+), 7 deletions(-) + +Oran Agra in commit a2ae46352: + tests: each test client work on a distinct port range + 5 files changed, 39 insertions(+), 27 deletions(-) + +Oran Agra in commit 86e562d69: + 32bit CI needs to build modules correctly + 2 files changed, 7 insertions(+), 2 deletions(-) + +Oran Agra in commit ab2984b1e: + adjust revived meaningful offset tests + 1 file changed, 39 insertions(+), 20 deletions(-) + +Oran Agra in commit 1ff5a222d: + revive meaningful offset tests + 2 files changed, 213 insertions(+) + +antirez in commit cc549b46a: + Replication: showLatestBacklog() refactored out. + 3 files changed, 36 insertions(+), 25 deletions(-) + +antirez in commit 377dd0515: + Drop useless line from replicationCacheMaster(). + 1 file changed, 2 deletions(-) + +antirez in commit 3f8d113f1: + Another meaningful offset test removed. + 1 file changed, 100 deletions(-) + +antirez in commit d4541349d: + Remove the PSYNC2 meaningful offset test. + 2 files changed, 113 deletions(-) + +antirez in commit 2112a5702: + Remove the meaningful offset feature. + 4 files changed, 10 insertions(+), 93 deletions(-) + +antirez in commit d2eb6e0b4: + Set a protocol error if master use the inline protocol. + 1 file changed, 17 insertions(+), 2 deletions(-) + +Oran Agra in commit 9c1df3b76: + daily CI test with tls + 1 file changed, 15 insertions(+) + +Oran Agra in commit 115ed1911: + avoid using sendfile if tls-replication is enabled + 1 file changed, 34 insertions(+), 27 deletions(-) + +antirez in commit 11c748aac: + Replication: log backlog creation event. + 1 file changed, 3 insertions(+) + +antirez in commit 8f1013722: + Test: PSYNC2 test can now show server logs. + 1 file changed, 88 insertions(+), 25 deletions(-) + +antirez in commit 2e591fc4a: + Clarify what is happening in PR #7320. + 1 file changed, 5 insertions(+), 1 deletion(-) + +zhaozhao.zz in commit cbb51fb8f: + PSYNC2: second_replid_offset should be real meaningful offset + 1 file changed, 3 insertions(+), 3 deletions(-) + +Oran Agra in commit e0fc88b4d: + add CI for 32bit build + 2 files changed, 34 insertions(+) + +antirez in commit e3f864b5f: + Make disconnectSlaves() synchronous in the base case. + 3 files changed, 20 insertions(+), 9 deletions(-) + +ShooterIT in commit 8af1e513f: + Implements sendfile for redis. + 2 files changed, 55 insertions(+), 2 deletions(-) + +antirez in commit 3c21418cd: + Fix #7306 less aggressively. + 2 files changed, 29 insertions(+), 17 deletions(-) + +Madelyn Olson in commit e201f83ce: + EAGAIN for tls during diskless load + 1 file changed, 4 insertions(+) + +Qu Chen in commit 58fc456cb: + Disconnect chained replicas when the replica performs PSYNC with the master always to avoid replication offset mismatch between master and chained replicas. + 2 files changed, 60 insertions(+), 3 deletions(-) + +hwware in commit 3febc5c29: + using moreargs variable + 1 file changed, 2 insertions(+), 2 deletions(-) + +hwware in commit 8d6738559: + fix server crash for STRALGO command + 1 file changed, 2 insertions(+), 2 deletions(-) + +ShooterIT in commit 7a35eec54: + Replace addDeferredMultiBulkLength with addReplyDeferredLen in comment + 1 file changed, 2 insertions(+), 2 deletions(-) + +Yossi Gottlieb in commit f93e1417b: + TLS: Improve tls-protocols clarity in redis.conf. + 1 file changed, 3 insertions(+), 2 deletions(-) + +ShooterIT in commit d0c9e4454: + Fix reply bytes calculation error + 1 file changed, 1 insertion(+), 1 deletion(-) + +zhaozhao.zz in commit 1cde6a060: + Tracking: flag CLIENT_TRACKING_BROKEN_REDIR when redir broken + 1 file changed, 1 insertion(+) + +Oran Agra in commit 436be3498: + fix a rare active defrag edge case bug leading to stagnation + 4 files changed, 146 insertions(+), 23 deletions(-) + +Oran Agra in commit f9d2ffdc5: + improve DEBUG MALLCTL to be able to write to write only fields. + 1 file changed, 27 insertions(+), 7 deletions(-) + +hujie in commit d7968ee92: + fix clear USER_FLAG_ALLCOMMANDS flag in acl + 1 file changed, 5 insertions(+), 4 deletions(-) + +ShooterIT in commit a902e6b25: + Redis Benchmark: generate random test data + 1 file changed, 12 insertions(+), 1 deletion(-) + +hwware in commit 9564ed7c3: + Redis-Benchmark: avoid potentical memmory leaking + 1 file changed, 1 insertion(+), 1 deletion(-) + +WuYunlong in commit 2e4182743: + Handle keys with hash tag when computing hash slot using tcl cluster client. + 1 file changed, 23 insertions(+), 2 deletions(-) + +WuYunlong in commit eb2c8b2c6: + Add a test to prove current tcl cluster client can not handle keys with hash tag. + 1 file changed, 7 insertions(+), 1 deletion(-) + +ShooterIT in commit 928e6976b: + Use dictSize to get the size of dict in dict.c + 1 file changed, 2 insertions(+), 2 deletions(-) + +Madelyn Olson in commit cdcf5af5a: + Converge hash validation for adding and removing + 1 file changed, 21 insertions(+), 14 deletions(-) + +Benjamin Sergeant in commit e8b09d220: + do not handle --cluster-yes for cluster fix mode + 1 file changed, 16 insertions(+), 7 deletions(-) + +Benjamin Sergeant in commit 57b4fb0d8: + fix typo ... + 1 file changed, 1 insertion(+), 1 deletion(-) + +Benjamin Sergeant in commit 29f25e411: + Redis-cli 6.0.1 `--cluster-yes` doesn't work (fix #7246) + 1 file changed, 5 insertions(+), 1 deletion(-) + +Oran Agra in commit 00d8b92b8: + fix valgrind test failure in replication test + 1 file changed, 1 insertion(+), 1 deletion(-) + +Oran Agra in commit 5e17e6276: + add regression test for the race in #7205 + 1 file changed, 52 insertions(+) + +antirez in commit 96e7c011e: + Improve the PSYNC2 test reliability. + 1 file changed, 33 insertions(+), 15 deletions(-) + +================================================================================ Redis 6.0.3 Released Sat May 16 18:10:21 CEST 2020 ================================================================================ diff --git a/src/version.h b/src/version.h index 8ae7b0cb3..8efc3c5aa 100644 --- a/src/version.h +++ b/src/version.h @@ -1 +1 @@ -#define REDIS_VERSION "6.0.3" +#define REDIS_VERSION "6.0.4" |