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How Does Wal Help When A Regionserver Crashes? |
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Answer» The Write Ahead Log (WAL) RECORDS all changes to DATA in HBASE, to file-based STORAGE. if a RegionServer CRASHES or becomes unavailable before the MemStore is flushed, the WAL ensures that the changes to the data can be replayed. The Write Ahead Log (WAL) records all changes to data in HBase, to file-based storage. if a RegionServer crashes or becomes unavailable before the MemStore is flushed, the WAL ensures that the changes to the data can be replayed. |
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