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Improve sharing and diffability of IndexRoutingTable #94933

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2 tasks
Tracked by #77466
DaveCTurner opened this issue Mar 31, 2023 · 1 comment
Open
2 tasks
Tracked by #77466

Improve sharing and diffability of IndexRoutingTable #94933

DaveCTurner opened this issue Mar 31, 2023 · 1 comment
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:Distributed/Allocation All issues relating to the decision making around placing a shard (both master logic & on the nodes) >enhancement Supportability Improve our (devs, SREs, support eng, users) ability to troubleshoot/self-service product better. Team:Distributed Meta label for distributed team >tech debt

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@DaveCTurner
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Today IndexRoutingTable$Builder#build constructs an all-new IndexShardRoutingTable for each shard on every change. High-traffic clusters may have large numbers of shards per index, and today's behaviour yields many duplicate IndexShardRoutingTable instances which together may consume a substantial amount of heap on the elected master.

Moreover IndexRoutingTable is a SimpleDiffable so we must transmit the whole table over the wire on any change, which prevents sharing on the receiving node and therefore yields many duplicate IndexShardRoutingTable instances on the other nodes in the cluster.

We should:

  • Re-use existing IndexShardRoutingTable instances where possible when adjusting the routing table on the elected master
  • Refine the diffability of the IndexRoutingTable so that it avoids sending unchanged IndexShardRoutingTable instances over the wire.

Relates #77466
@DaveCTurner DaveCTurner added >enhancement :Distributed/Allocation All issues relating to the decision making around placing a shard (both master logic & on the nodes) Supportability Improve our (devs, SREs, support eng, users) ability to troubleshoot/self-service product better. labels Mar 31, 2023
@elasticsearchmachine elasticsearchmachine added the Team:Distributed Meta label for distributed team label Mar 31, 2023
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Pinging @elastic/es-distributed (Team:Distributed)

@DaveCTurner DaveCTurner mentioned this issue Mar 31, 2023
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:Distributed/Allocation All issues relating to the decision making around placing a shard (both master logic & on the nodes) >enhancement Supportability Improve our (devs, SREs, support eng, users) ability to troubleshoot/self-service product better. Team:Distributed Meta label for distributed team >tech debt
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