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  1. HBase
  2. HBASE-19833 Refactor Servers: async, event-driven core, startup/shutdown sequencing, etc.
  3. HBASE-19831

Regions on the Master Redux

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    • Sub-task
    • Status: Resolved
    • Major
    • Resolution: Won't Fix
    • None
    • None
    • None
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    Description

      HBASE-10569 made it so Master could host Regions. It was done a long time ago (before hbase-1.0.0). This option was used in a few instances.

      Come hbase-2.0.0, we've found that master-as-regionserver has problems. This is an umbrella issue to address problems found. Meantime, master-as-regionserver is broke.

      In particular, the startup sequence needs redo – the bit where the Master checks in as a RegionServer in time to be factored as a Server when the balancer first runs. Then there is what to do about changing state in AMv2. Region state is locked when changed. Currently it can involve an RPC to hbase:meta. If problem contacting other Server, the lock on region state can last a long time shutting out Master function. What should we do w/ backup Masters? They should host regions too. And so on.

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          blocks

          Bug - A problem which impairs or prevents the functions of the product. HBASE-20779 Server version is not right when enable TABLES_ON_MASTER

          • Major - Major loss of function.
          • Resolved
          relates to

          Sub-task - The sub-task of the issue HBASE-19785 System Regions on the Master is broken

          • Major - Major loss of function.
          • Resolved

          Sub-task - The sub-task of the issue HBASE-19834 Signalling server-hosted-clients to abort retries

          • Major - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. HBASE-19694 The initialization order for a fresh cluster is incorrect

          • Critical - Crashes, loss of data, severe memory leak.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. HBASE-19828 Flakey TestRegionsOnMasterOptions.testRegionsOnAllServers

          • Major - Major loss of function.
          • Resolved

          Task - A task that needs to be done. HBASE-18511 Default no regions on master

          • Blocker - Blocks development and/or testing work, production could not run
          • Resolved

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              stack Michael Stack
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              Dates

                Created:
                Updated:
                Resolved: