Method Detail

• preWALWrite

  boolean preWALWrite(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
                    HRegionInfo info,
                    WALKey logKey,
                    WALEdit logEdit)
                      throws IOException

  Called before a WALEdit is writen to WAL.

  Returns:

  true if default behavior should be bypassed, false otherwise

  Throws:

  IOException

• preWALWrite

  @Deprecated
  boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx,
                               HRegionInfo info,
                               HLogKey logKey,
                               WALEdit logEdit)
                      throws IOException

  Deprecated. use preWALWrite(ObserverContext, HRegionInfo, WALKey, WALEdit)
  Called before a WALEdit is writen to WAL. This method is left in place to maintain binary compatibility with older WALObservers. If an implementation directly overrides preWALWrite(ObserverContext, HRegionInfo, WALKey, WALEdit) then this version won't be called at all, barring problems with the Security Manager. To work correctly in the presence of a strict Security Manager, or in the case of an implementation that relies on a parent class to implement preWALWrite, you should implement this method as a call to the non-deprecated version. Users of this method will see all edits that can be treated as HLogKey. If there are edits that can't be treated as HLogKey they won't be offered to coprocessors that rely on this method. If a coprocessor gets skipped because of this mechanism, a log message at ERROR will be generated per coprocessor on the logger for CoprocessorHost once per classloader.

  Returns:

  true if default behavior should be bypassed, false otherwise

  Throws:

  IOException

• postWALWrite

  void postWALWrite(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
                  HRegionInfo info,
                  WALKey logKey,
                  WALEdit logEdit)
                    throws IOException

  Called after a WALEdit is writen to WAL.

  Throws:

  IOException

• postWALWrite

  @Deprecated
  void postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx,
                             HRegionInfo info,
                             HLogKey logKey,
                             WALEdit logEdit)
                    throws IOException

  Deprecated. use postWALWrite(ObserverContext, HRegionInfo, WALKey, WALEdit)
  Called after a WALEdit is writen to WAL. This method is left in place to maintain binary compatibility with older WALObservers. If an implementation directly overrides postWALWrite(ObserverContext, HRegionInfo, WALKey, WALEdit) then this version won't be called at all, barring problems with the Security Manager. To work correctly in the presence of a strict Security Manager, or in the case of an implementation that relies on a parent class to implement preWALWrite, you should implement this method as a call to the non-deprecated version. Users of this method will see all edits that can be treated as HLogKey. If there are edits that can't be treated as HLogKey they won't be offered to coprocessors that rely on this method. If a coprocessor gets skipped because of this mechanism, a log message at ERROR will be generated per coprocessor on the logger for CoprocessorHost once per classloader.

  Throws:

  IOException

• preWALRoll

  void preWALRoll(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
                org.apache.hadoop.fs.Path oldPath,
                org.apache.hadoop.fs.Path newPath)
                  throws IOException

  Called before rolling the current WAL

  Parameters:

  oldPath - the path of the current wal that we are replacing

  newPath - the path of the wal we are going to create

  Throws:

  IOException

• postWALRoll

  void postWALRoll(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
                 org.apache.hadoop.fs.Path oldPath,
                 org.apache.hadoop.fs.Path newPath)
                   throws IOException

  Called after rolling the current WAL

  Parameters:

  oldPath - the path of the wal that we replaced

  newPath - the path of the wal we have created and now is the current

  Throws:

  IOException