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This article explains how to verify whether OceanBase's freeze mechanism and memstore dump processes are functioning correctly by querying internal tables, inspecting logs, and checking related metrics such as active_memstore_used, major_freeze_trigger, and MemTable reference counts.
This article presents a detailed performance test of HBase 2.x write throughput on a five‑node SSD cluster, identifies latency spikes caused by MemStore flush and ConcurrentSkipListMap size() overhead, and demonstrates how fixing the bug and applying in‑memory compaction dramatically reduces P999 and P9999 latency while preserving throughput.
The article systematically explains how HBase's MemStore uses a SkipList‑based model and introduces successive memory‑management optimizations—MemStoreLAB, ChunkPool, off‑heap chunks, CompactingMemStore and the CCSMap data structure—to reduce object overhead, GC pressure and improve throughput.
This article explains the complete HBase write flow, the problems caused by rapid writes such as memstore overflow and RegionTooBusyException, and provides configuration and operational strategies to avoid RegionServer out‑of‑memory crashes.
The article explains how excessive HBase partitions can cause frequent flushes, compaction storms, high memory usage, long master assignment times, and reduced MapReduce concurrency, and provides formulas and guidelines for calculating a reasonable number of regions per RegionServer.
This article presents a detailed post‑mortem of a 10‑node HBase cluster failure caused by excessive region count and memstore pressure, analyzes HDFS and datanode log errors, and outlines configuration adjustments and operational recommendations that restored the service and prevented future outages.