org.apache.solr.update

Class HdfsTransactionLog

java.lang.Object

org.apache.solr.update.TransactionLog

org.apache.solr.update.HdfsTransactionLog

All Implemented Interfaces:

Closeable, AutoCloseable

public class HdfsTransactionLog
extends TransactionLog

Log Format: List{Operation, Version, ...} ADD, VERSION, DOC DELETE, VERSION, ID_BYTES DELETE_BY_QUERY, VERSION, String TODO: keep two files, one for [operation, version, id] and the other for the actual document data. That way we could throw away document log files more readily while retaining the smaller operation log files longer (and we can retrieve the stored fields from the latest documents from the index). This would require keeping all source fields stored of course. This would also allow to not log document data for requests with commit=true in them (since we know that if the request succeeds, all docs will be committed)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	HdfsTransactionLog.HDFSLogReader
class	HdfsTransactionLog.HDFSReverseReader

Nested classes/interfaces inherited from class org.apache.solr.update.TransactionLog

TransactionLog.FSReverseReader, TransactionLog.LogCodec, TransactionLog.LogReader, TransactionLog.ReverseReader

Field Summary

Fields inherited from class org.apache.solr.update.TransactionLog

deleteOnClose, END_MESSAGE

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	endsWithCommit()
void	finish(UpdateLog.SyncLevel syncLevel)
TransactionLog.LogReader	getReader(long startingPos) Returns a reader that can be used while a log is still in use.
TransactionLog.ReverseReader	getReverseReader() Returns a single threaded reverse reader
Object	lookup(long pos)
void	rollback(long pos)
String	toString()
long	writeCommit(CommitUpdateCommand cmd, int flags)

Methods inherited from class org.apache.solr.update.TransactionLog

addGlobalStrings, decref, endRecord, forceClose, getLogSize, incref, numRecords, position, snapshot, try_incref, write, writeData, writeDelete, writeDeleteByQuery, writeLogHeader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

endsWithCommit

public boolean endsWithCommit()
                       throws IOException

Overrides:

endsWithCommit in class TransactionLog

Throws:

IOException

rollback

public void rollback(long pos)
              throws IOException

Overrides:

rollback in class TransactionLog

Throws:

IOException

writeCommit

public long writeCommit(CommitUpdateCommand cmd,
                        int flags)

Overrides:

writeCommit in class TransactionLog

lookup

public Object lookup(long pos)

Overrides:

lookup in class TransactionLog

finish

public void finish(UpdateLog.SyncLevel syncLevel)

Overrides:

finish in class TransactionLog

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class TransactionLog

toString

public String toString()

Overrides:

toString in class TransactionLog

getReader

public TransactionLog.LogReader getReader(long startingPos)

Returns a reader that can be used while a log is still in use. Currently only *one* LogReader may be outstanding, and that log may only be used from a single thread.

Overrides:

getReader in class TransactionLog

getReverseReader

public TransactionLog.ReverseReader getReverseReader()
                                              throws IOException

Returns a single threaded reverse reader

Overrides:

getReverseReader in class TransactionLog

Throws:

IOException