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FSEditLogOp$Reader.scanOp
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How to use
scanOp
method
in
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Reader

Best Java code snippets using org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Reader.scanOp (Showing top 3 results out of 315)

origin: org.apache.hadoop/hadoop-hdfs

@Override
protected long scanNextOp() throws IOException {
 Preconditions.checkState(state == State.OPEN);
 FSEditLogOp cachedNext = getCachedOp();
 return cachedNext == null ? reader.scanOp() : cachedNext.txid;
}
origin: ch.cern.hadoop/hadoop-hdfs

@Override
protected long scanNextOp() throws IOException {
 Preconditions.checkState(state == State.OPEN);
 FSEditLogOp cachedNext = getCachedOp();
 return cachedNext == null ? reader.scanOp() : cachedNext.txid;
}
origin: io.prestosql.hadoop/hadoop-apache

@Override
protected long scanNextOp() throws IOException {
 Preconditions.checkState(state == State.OPEN);
 FSEditLogOp cachedNext = getCachedOp();
 return cachedNext == null ? reader.scanOp() : cachedNext.txid;
}
org.apache.hadoop.hdfs.server.namenodeFSEditLogOp$ReaderscanOp

Javadoc

Similar to decodeOp(), but we only retrieve the transaction ID of the Op rather than reading it. If the edit log format supports length prefixing, this can be much faster than full decoding.

Popular methods of FSEditLogOp$Reader

  • readOp
    Read an operation from the input stream. Note that the objects returned from this method may be re-u
  • <init>
    Construct the reader
  • setMaxOpSize
  • decodeOp
    Read an opcode from the input stream.
  • validateChecksum
    Validate a transaction's checksum
  • verifyTerminator
  • create
  • getChecksum

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