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All notable changes to this project are documented in this file. See also TiDB Release Notes and PD Changelog.
zstd to compress the Region snapshot #10005
IN expression #10018
cast_string_as_time is invalid UTF-8 bytes #9995
rocksdb.auto-tuned configuration item with rocksdb.rate-limiter-auto-tuned
raftstore.sync-log configuration item. By default, written data is forcibly spilled to the disk. Before v5.0, you can explicitly disable raftstore.sync-log. Since v5.0, the configuration value is forcibly set to true
gc.enable-compaction-filter configuration item from false to true
rate-limiter-auto-tuned configuration item from false to true
security.redact-info-log. Its default value is false, which means that desensitization is disabled. To enable desensitization for tikv-server logs, set the variable value to true
leader-transfer-max-log-lag to 128 to increase the success rate of leader transfer #9605
IN expression does not properly handle unsigned/signed integers #9850
PROST=1 #9604
region-split-check-diff cannot be customized #9530
split command #8936
pessimistic-txn.pipelined configuration #9100
apply-max-batch-size and store-max-batch-size to 1024 #9020
max-background-flushes configuration item #8947
force-consistency-checks by default to improve performance #9029
ANALYZE statement might cause panic when using the latin1 character set #9082
advertise-status-addr value (0.0.0.0) #9036
security.redact-info-log configuration item, which redacts user data from logs #8746
pessimistic-txn.pipelined configuration #8853
tikv-ctl recover-mvcc does not remove invalid pessimistic locks #8047
duplicated error to TiCDC #7887
use-unified-pool configuration in the startup log is incorrectly printed #7946
read index request may get out-of-date commit index #8043
--advertise-status-addr start flag to specify the status address to advertise #8046
ascii_bin and latin1_bin is not supported by TiKV for new collation framework. #7919
[encryption] in the TiKV configuration file to [security.encryption] #7810
batch insert request #7718
join operation when the TiKV server is shut down #7713
snapshot ingestion error when encrytion is enabled #7815
Invalid cross-device link error when rewriting the configuration file #7817
split region operation #7623
BatchRollback to improve performance when many write conflicts exist in optimistic transactions #7604
group by constant error #7383
pipelined feature in pessimistic transactions, which improves the TPC-C performance by 20%. The risk is that the transaction commit might fail because of lock failure during the execution #6984
unify-read-pool configuration item in new clusters by default and use the previous setting of this item in old clusters #7059
pipelined feature in pessimistic transactions, which improves the TPC-C performance by 20%. The risk is that the transaction commit might fail because of lock failure during the execution #6984
unify-read-pool configuration item in new clusters by default and use the previous setting of this item in old clusters #7059
CAST function behaves inconsistently in TiKV and in TiDB
backup
start_key to the hash value of start_key to reduce the file name's length for easy reading (https://github.com/tikv/tikv/pull/6198)force_consistency_checks check to avoid false positives in the consistency check #6249
sst_importer
tikv_import_download_duration, tikv_import_download_bytes, tikv_import_ingest_duration, tikv_import_ingest_bytes, and tikv_import_error_counter to observe the overheads of downloading and ingesting SST files #6404
raftstore
end_point_slow_log_threshold configuration item #9145
sync-log to true as an nonadjustable value #8636
hibernate-timeout configuration that delays region hibernation to improve rolling update performance #8207
BatchRollback condition exist in optimistic transactions #7605
waiter is frequently awakened when many conflicts exist in pessimistic transactions #7584
tikv_lock_manager_waiter_lifetime_duration, tikv_lock_manager_detect_duration, and tikv_lock_manager_detect_duration monitoring metrics to monitor waiters’ lifetime, the time cost of detecting deadlocks, and the status of Wait table #6392
wait-for-lock-time from 3s to 1s
wake-up-delay-duration from 100ms to 20ms
tikv_alloc from tikv_alloc/default to jemalloc #6206
reverse-scan #5368
PointGetter performance issue when there are concurrent write #5495
titan GC and monitoring improvement #5517
grpcio to v0.4.5 #5523
PutStore #5277
grpc env to create deadlock clients #5346
config-check to check whether the configuration is correct #5349
blob_run_mode to decide whether to enable the Titan engine on a specific CF #4991
blob-run-mode configuration parameter to control the running mode of the Titan engine, and its value can be normal, read-only or fallback #4865
Improve the performance of detecting deadlocks #5089
Iterator Key Bound Option
block cache sharing among different column familiesraw_scan and raw_batch_scan
batch commands
Insert to allow Prewrite to succeed only when there is no Keytxn scheduler
read index and GC worker
EXPLAIN ANALYZE statement
in TiDBwork-stealing thread pool model to reduce context switch costbad-regions and tombstone subcommands. 4862
ReadIndex requests for the learner #4653
LogicalOr #4691
LTReal #4602
LEReal #4602
GTReal #4602
GEReal #4602
NEReal #4602
EQReal #4602
IsNull #4720
IsTrue #4720
IsFalse #4720
Int #4625
Decimal #4625
String #4625
Time #4625
Duration #4625
Json #4625
Int #4733
Real #4733
Decimal #4733
Int #4727
Real #4727
Decimal #4727
Int #4746
Real #4746
Decimal #4746
Iterator Key Bound Option #4537
block cache sharing among different column families#4612
properties index distance #4517
BatchLimitExecutor #4469
futures-cpupool with tokio-threadpool in ReadPool to reduce context switch #4486
BatchSelectionExecutor #4562
AVG #4570
LogicalAnd#4575
tcmalloc as a memory allocator #4370
BatchRows row and the BatchColumn column #3660
VectorLike to support accessing encoded and decoded data in the same way #4242
BatchExecutor to interface and implement the way of converting requests to BatchExecutor #4243
BatchTableScanExecutor vectorization calculation operator #4351
INSERT operation, make prewrite succeed only when keys do not exist, and eliminate Batch Get #4085
raw_scan and raw_batch_scan #3724
is_merging is given an incorrect value in the process of merging Regions and applying the Compact log #5884
config-check option in TiKV to check whether the TiKV configuration item is valid #5391
get_txn_commit_info process to speed up committing transactions #5062
block-size configuration #4930
ScanLock and ResolveLock in the thread pool with a high priority to reduce their impacts on commands with a normal priority #4791
CommitMerge may cause TiKV unable to restart #4615
lz4 to reduce CPU consumption #4624
level_zero_slowdown_writes_trigger/2 #4464
StoreNotMatch issue caused by decoding protobuf error in some cases #4303
KeyNotInRegion error in some cases #4125
StoreNotMatch error message #3885
DAY (d) and fix the configuration compatibility issue #3931
Approximate Size Split #3942
ReadPool to improve the concurrency in processing the requestsUnsafeDestroyRange API to support to collecting space for the dropping table/indexupper bound support in the kv_scan commandLocalReader thread to process read requests and reduce the delay for read requestsBatchSplit to avoid large Region brought by large amounts of writeRegion Split according to statistics to reduce the I/O overheadRegion Split according to the number of keys to improve the concurrency of index scanRegion Split
PreVote feature by default to reduce the impact of network isolation on servicesCompactFiles bug in RocksDB and reduce the impact on importing data using LightningIngestExternalFile to avoid the issue that flush could block writeldb command to diagnose RocksDB related issuescompact command supports specifying whether to compact data in the bottommost levelWriteConflict #3750
kv_scan interface #3749
tick metrics #3657
IngestExternalFile #3661
sha1 function #3612
truncate_int function #3532
year function #3622
truncate_real function #3633
leader-transfer-max-log-lag configuration to fix the failure issue of leader scheduling in specific scenarios #3507
max-open-engines configuration to limit the number of engines opened by tikv-importer simultaneously #3496
snapshot apply #3547
PreVote message of the newly split Region #3557
batch split to avoid too large Regions caused by the Write operation on hot RegionsLocalReader to separate the Read operation from the raftstore thread to lower the Read latencyprevote to speed up service recovery when the network is abnormalscheduler_latch
dynamic_level_bytes parameter based on the existing datagRPC max_send_message_len is set mistakenlyregion_size
nightly-2018-06-14 versionRaft PreVote configuration to avoid leader reelection generated when network recovers after network isolationingest related information in each layer of RocksDBkey with too many versions when GC worksstatic metric to optimize multi-label metric performance (YCSB raw get is improved by 3%)box in multiple modules and use patterns to improve the operating performance (YCSB raw get is improved by 3%)asynchronous log to improve the performance of writing logsbox used in the application to improve the performancePerfContext interface for debuggingregion-properties command for tikv-ctl
import-mode parameterreverse-seek is slow when many RocksDB tombstones existdo_sub
thread_yield callsSELECT FOR UPDATE prevents others from readingRegion Merge [experimental]Raw DeleteRange APIGetMetric APIRaw Batch Put, Raw Batch Get, Raw Batch Delete and Raw Batch Scan
block-cache-size
tikv-ctl
ImportSST API to import SST files [experimental]ReadPool and increase the raw_get/get/batch_get by 30%DeleteFilesInRanges
keepalive of gRPCtikv-ctl
tikv-ctl
tikv-ctl
tikv-ctl now can send consistency-check requests to TiKVtikv-ctl
tikv-ctl
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