hdfs杂记

最新推荐文章于 2025-04-27 15:07:36 发布

frank0712105003

最新推荐文章于 2025-04-27 15:07:36 发布

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分类专栏： hdfs

本文链接：https://blog.youkuaiyun.com/frank0712105003/article/details/88955911

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本文介绍了HDFS中Replica的各种状态及其含义，包括最终化、正在写入、等待恢复等，并详细阐述了块构造过程的不同阶段，如管道设置、数据流传输及关闭等。

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Replica状态

/** Replica is finalized. The state when replica is not modified. */
FINALIZED(0),
/** Replica is being written to. */
RBW(1),
/** Replica is waiting to be recovered. */
RWR(2),
/** Replica is under recovery. */
RUR(3),
/** Temporary replica: created for replication and relocation only. */
TEMPORARY(4);

blockconstruction状态


// pipeline set up for block append
PIPELINE_SETUP_APPEND,
// pipeline set up for failed PIPELINE_SETUP_APPEND recovery
PIPELINE_SETUP_APPEND_RECOVERY,
// data streaming
DATA_STREAMING,
// pipeline setup for failed data streaming recovery
PIPELINE_SETUP_STREAMING_RECOVERY,
// close the block and pipeline
PIPELINE_CLOSE,
// Recover a failed PIPELINE_CLOSE
PIPELINE_CLOSE_RECOVERY,
// pipeline set up for block creation
PIPELINE_SETUP_CREATE,
// transfer RBW for adding datanodes
TRANSFER_RBW,
// transfer Finalized for adding datanodes
TRANSFER_FINALIZED;