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This article mainly shows you "how to use the ESlaveUpdate class", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use the ESlaveUpdate class" this article.

The ESlaveUpdate class description:

Class ESlaveUpdate: public LogEvent {EMetaBlob commit; bufferlist rollback; string type; metareqid_t reqid; mds_rank_t master; _ _ u8 op; _ _ u8 origop;}

Methods of the ESlaveUpdate class:

ESlaveUpdate::replay (mds)

| | _ _ classify according to the op value |

| | _ op==ESlaveUpdate::OP_PREPARE |

| | _ _ create a new MDSlaveUpdate class object |

| | _ _ execute EMetaBlob::replay () operation, that is, commit.replay () |

| | _ _ add uncommitted slave update information to MDCache, that is, mds- > mdcache- > add_uncommitted_slave_update () |

| | _ op==ESlaveUpdate::OP_COMMIT |

| | _ _ get uncommitted slave update information from MDCache, that is, mds- > mdcache- > get_uncommitted_slave_update () |

| | _ _ perform finish uncommitted slave update operation in MDCache, that is, mds- > mdcache- > finish_uncommitted_slave_update () |

| | _ op==ESlaveUpdate::OP_ROLLBACK |

| | _ _ execute EMetaBlob::replay () operation, that is, commit.replay () |

| | _ _ get uncommitted slave update information from MDCache, that is, mds- > mdcache- > get_uncommitted_slave_update () |

| | _ _ perform finish uncommitted slave update operation in MDCache, that is, mds- > mdcache- > finish_uncommitted_slave_update () |

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