public static interface WALProvider.WriterBase extends Closeable
|Modifier and Type||Method and Description|
NOTE: We add this method for
WALFileLengthProviderused for replication, considering the case if we use
AsyncFSWAL,we write to 3 DNs concurrently, according to the visibility guarantee of HDFS, the data will be available immediately when arriving at DN since all the DNs will be considered as the last one in pipeline. This means replication may read uncommitted data and replicate it to the remote cluster and cause data inconsistency. The method
getLength()may return length which just in hdfs client buffer and not successfully synced to HDFS, so we use this method to return the length successfully synced to HDFS and replication thread could only read writing WAL file limited by this length. see also HBASE-14004 and this document for more details: https://docs.google.com/document/d/11AyWtGhItQs6vsLRIx32PwTxmBY3libXwGXI25obVEY/edit#
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