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Bigtable, chunk formats, fixes and breaking changes
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@Dieterbe Dieterbe released this 19 Dec 14:52
· 2489 commits to master since this release
v0.11.0
e5cdcf0

Important changes that require your attention:

  1. with our previous chunk format, when both:

    • using chunks of >4 hours
    • the time delta between start of chunk and first point is >4.5 hours

    the encoded delta became corrupted and reading the chunk results in incorrect data.
    This release brings a remediation to recover the data at read time, as well
    as a new chunk format that does not suffer from the issue.
    The new chunks are also about 9 bytes shorter in the typical case.
    While metrictank now writes to the store exclusively using the new format, it can read from the store in any of the formats.
    This means readers should be upgraded before writers,
    to avoid the situation where an old reader cannot parse the chunk written by a newer
    writer during an upgrade. See #1126, #1129

  2. we now use logrus for logging #1056, #1083
    Log levels are now strings, not integers.
    See the updated config file

  3. index pruning is now configurable via index-rules.conf #924, #1120
    We no longer use a max-stale setting in the cassandra-idx section,
    and instead gained an index-rules-conf setting.

  4. The NSQ cluster notifier has been removed. NSQ is a delight to work with, but we could
    only use it for a small portion of our clustering needs, requiring Kafka anyway for data ingestion
    and distribution. We've been using Kafka for years and neglected the NSQ notifier code, so it's time to rip it out.
    See #1161

  5. the offset manager for the kafka input / notifier plugin has been removed since there was no need for it.
    offset=last is thus no longer valid. See #1110

index and store

  • support for bigtable index and storage #1082, #1114, #1121
  • index pruning rate limiting #1065 , #1088
  • clusterByFind: limit series and streaming processing #1021
  • idx: better log msg formatting, include more info #1119

clustering

  • fix nodes sometimes not becoming ready by dropping node updates that are old or about thisNode. #948

operations

  • disable tracing for healthchecks #1054
  • Expose AdvertiseAddr from the clustering configuration #1063 , #1097
  • set sarama client KafkaVersion via config #1103
  • Add cache overhead accounting #1090, #1184
  • document cache delete #1122
  • support per-org metrics_active for scraping by prometheus #1160
  • fix idx active metrics setting #1169
  • dashboard: give rows proper names #1184

tank

  • cleanup GC related code #1166
  • aggregated chunk GC fix (for sparse data, aggregated chunks were GC'd too late, which may result in data loss when doing cluster restarts),
    also lower default metric-max-stale #1175, #1176
  • allow specifying timestamps to mark archives being ready more granularly #1178

tools

  • mt-index-cat: add partition support #1068 , #1085
  • mt-index-cat: add min-stale option, rename max-age to max-stale #1064
  • mt-index-cat: support custom patterns and improve bench-realistic-workload-single-tenant.sh #1042
  • mt-index-cat: make NameWithTags() callable from template format #1157
  • mt-store-cat: print t0 of chunks #1142
  • mt-store-cat: improvements: glob filter, chunk-csv output #1147
  • mt-update-ttl: tweak default concurrency, stats fix, properly use logrus #1167
  • mt-update-ttl: use standard store, specify TTL's not tables, auto-create tables + misc #1173
  • add mt-kafka-persist-sniff tool #1161
  • fixes #1124

misc

  • better benchmark scripts #1015
  • better documentation for our input formats #1071
  • input: prevent integer values overflowing our index datatypes, which fixes index saves blocking #1143
  • fix ccache memory leak #1078
  • update jaeger-client to 2.15.0 #1093
  • upgrade Sarama to v1.19 #1127
  • fix panic caused by multiple closes of pluginFatal channel #1107
  • correctly return error from NewCassandraStore() #1111
  • clean way of skipping expensive and integration tests. #1155, #1156
  • fix duration vars processing and error handling in cass idx #1141
  • update release process, tagging, repo layout and version formatting. update to go1.11.4 #1177, #1180, #1181
  • update docs for bigtable, storage-schemas.conf and tank GC #1182
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