public class HDFSTransactionLogReaderV1 extends Object implements TransactionLogReader
TransactionLogReader
that can read v1 (default) version of Transaction logs. The logs are expected to
have a sequence of TransactionEdit
s.Constructor and Description |
---|
HDFSTransactionLogReaderV1(org.apache.hadoop.io.SequenceFile.Reader reader) |
Modifier and Type | Method and Description |
---|---|
void |
close() |
TransactionEdit |
next()
Returns the next
TransactionEdit from the log file, based on the current position, or null
if the end of the file has been reached. |
TransactionEdit |
next(TransactionEdit reuse)
Populates
reuse with the next TransactionEdit , based on the reader's current position in the
log file. |
public HDFSTransactionLogReaderV1(org.apache.hadoop.io.SequenceFile.Reader reader)
public TransactionEdit next() throws IOException
TransactionLogReader
TransactionEdit
from the log file, based on the current position, or null
if the end of the file has been reached.next
in interface TransactionLogReader
IOException
public TransactionEdit next(TransactionEdit reuse) throws IOException
TransactionLogReader
reuse
with the next TransactionEdit
, based on the reader's current position in the
log file.next
in interface TransactionLogReader
reuse
- The TransactionEdit
instance to populate with the log entry data.TransactionEdit
instance, or null
if the end of the file has been reached.IOException
- If an error is encountered reading the log data.public void close() throws IOException
close
in interface Closeable
close
in interface AutoCloseable
IOException
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