[HDFS-14450] Erasure Coding: decommissioning datanodes cause replicate a large number of duplicate EC internal blocks

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Component/s: ec
• Assignee: Wu Weiwei
• Reporter: Wu Weiwei
• Created: 23/Apr/19 08:01
• Updated: 24/Oct/19 20:08
• Resolved: 24/Oct/19 20:08

Description

//  [WARN] [RedundancyMonitor] : Failed to place enough replicas, still in need of 2 to reach 167 (unavailableStorages=[DISK, ARCHIVE], storagePolicy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]}, newBlock=false) All required storage types are unavailable:  unavailableStorages=[DISK, ARCHIVE], storagePolicy=BlockStoragePolicy{HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]}

In a large-scale cluster, decommissioning large-scale datanodes cause EC block groups to replicate a large number of duplicate internal blocks.

Issue Links

• duplicates: HDFS-14849 Erasure Coding: the internal block is replicated many times when datanode is decommissioning