Examples of org.apache.hcatalog.hbase.snapshot.lock.WriteLock

Package org.apache.hcatalog.hbase.snapshot.lock

Examples of org.apache.hcatalog.hbase.snapshot.lock.WriteLock

org.apache.hcatalog.hbase.snapshot.lock.WriteLock
A protocol to implement an exclusive write lock or to elect a leader.
You invoke {@link #lock()} tostart the process of grabbing the lock; you may get the lock then or it may be some time later.
You can register a listener so that you are invoked when you get the lock; otherwise you can ask if you have the lock by calling {@link #isOwner()}This class has been used as-is from the zookeeper 3.4.0 recipes. The only change made is a TODO for sorting using suffixes and the package name.

     *
     * @return revision ID
     * @throws IOException
     */
    public long obtainID() throws IOException {
        WriteLock wLock = new WriteLock(zookeeper, zNodeLockBasePath, Ids.OPEN_ACL_UNSAFE);
        wLock.setLockListener(this);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
                //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException("Unable to obtain lock to obtain id.");
            } else {
                id = incrementAndReadCounter();
            }
        } catch (KeeperException e) {
            LOG.warn("Exception while obtaining lock for ID.", e);
            throw new IOException("Exception while obtaining lock for ID.", e);
        } catch (InterruptedException e) {
            LOG.warn("Exception while obtaining lock for ID.", e);
            throw new IOException("Exception while obtaining lock for ID.", e);
        } finally {
            wLock.unlock();
        }
        return id;
    }

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            transaction.setKeepAlive(DEFAULT_WRITE_TRANSACTION_TIMEOUT);
        }


        refreshTransactionList(transaction.getTableName());
        String lockPath = prepareLockNode(table);
        WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
                Ids.OPEN_ACL_UNSAFE);
        RMLockListener myLockListener = new RMLockListener();
        wLock.setLockListener(myLockListener);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
              //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException(
                        "Unable to obtain lock while beginning transaction. "
                                + transaction.toString());
            } else {
                List<String> colFamilies = transaction.getColumnFamilies();
                FamilyRevision revisionData = transaction.getFamilyRevisionInfo();
                for (String cfamily : colFamilies) {
                    String path = PathUtil.getRunningTxnInfoPath(
                            baseDir, table, cfamily);
                    zkUtil.updateData(path, revisionData,
                            ZKUtil.UpdateMode.APPEND);
                }
            }
        } catch (KeeperException e) {
            throw new IOException("Exception while obtaining lock.", e);
        } catch (InterruptedException e) {
            throw new IOException("Exception while obtaining lock.", e);
        }
        finally {
            wLock.unlock();
        }


        return transaction;
    }

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     */
    public void commitWriteTransaction(Transaction transaction) throws IOException {
        refreshTransactionList(transaction.getTableName());


        String lockPath = prepareLockNode(transaction.getTableName());
        WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
                Ids.OPEN_ACL_UNSAFE);
        RMLockListener myLockListener = new RMLockListener();
        wLock.setLockListener(myLockListener);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
              //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException(
                        "Unable to obtain lock while commiting transaction. "
                                + transaction.toString());
            } else {
                String tableName = transaction.getTableName();
                List<String> colFamilies = transaction.getColumnFamilies();
                FamilyRevision revisionData = transaction.getFamilyRevisionInfo();
                for (String cfamily : colFamilies) {
                    String path = PathUtil.getRunningTxnInfoPath(
                            baseDir, tableName, cfamily);
                    zkUtil.updateData(path, revisionData,
                            ZKUtil.UpdateMode.REMOVE);
                }


            }
        } catch (KeeperException e) {
            throw new IOException("Exception while obtaining lock.", e);
        } catch (InterruptedException e) {
            throw new IOException("Exception while obtaining lock.", e);
        }
        finally {
            wLock.unlock();
        }
        LOG.info("Write Transaction committed: " + transaction.toString());
    }

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     */
    public void abortWriteTransaction(Transaction transaction) throws IOException {


        refreshTransactionList(transaction.getTableName());
        String lockPath = prepareLockNode(transaction.getTableName());
        WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
                Ids.OPEN_ACL_UNSAFE);
        RMLockListener myLockListener = new RMLockListener();
        wLock.setLockListener(myLockListener);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
              //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException(
                        "Unable to obtain lock while aborting transaction. "
                                + transaction.toString());
            } else {
                String tableName = transaction.getTableName();
                List<String> colFamilies = transaction.getColumnFamilies();
                FamilyRevision revisionData = transaction
                        .getFamilyRevisionInfo();
                for (String cfamily : colFamilies) {
                    String path = PathUtil.getRunningTxnInfoPath(
                            baseDir, tableName, cfamily);
                    zkUtil.updateData(path, revisionData,
                            ZKUtil.UpdateMode.REMOVE);
                    path = PathUtil.getAbortInformationPath(baseDir,
                            tableName, cfamily);
                    zkUtil.updateData(path, revisionData,
                            ZKUtil.UpdateMode.APPEND);
                }


            }
        } catch (KeeperException e) {
            throw new IOException("Exception while obtaining lock.", e);
        } catch (InterruptedException e) {
            throw new IOException("Exception while obtaining lock.", e);
        }
        finally {
            wLock.unlock();
        }
        LOG.info("Write Transaction aborted: " + transaction.toString());
    }

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            throws IOException {


         refreshTransactionList(transaction.getTableName());
         transaction.keepAliveTransaction();
         String lockPath = prepareLockNode(transaction.getTableName());
         WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
                 Ids.OPEN_ACL_UNSAFE);
         RMLockListener myLockListener = new RMLockListener();
         wLock.setLockListener(myLockListener);
         try {
             boolean lockGrabbed = wLock.lock();
             if (lockGrabbed == false) {
               //TO DO : Let this request queue up and try obtaining lock.
                 throw new IOException(
                         "Unable to obtain lock for keep alive of transaction. "
                                 + transaction.toString());
             }else {
                 String tableName = transaction.getTableName();
                 List<String> colFamilies = transaction.getColumnFamilies();
                 FamilyRevision revisionData = transaction.getFamilyRevisionInfo();
                 for (String cfamily : colFamilies) {
                     String path = PathUtil.getRunningTxnInfoPath(
                             baseDir, tableName, cfamily);
                     zkUtil.updateData(path, revisionData,
                             ZKUtil.UpdateMode.KEEP_ALIVE);
                 }


             }
         } catch (KeeperException e) {
             throw new IOException("Exception while obtaining lock.", e);
         } catch (InterruptedException e) {
             throw new IOException("Exception while obtaining lock.", e);
         }finally {
             wLock.unlock();
         }


    }

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         return zkUtil.getTransactionList(path);
    }


     private void refreshTransactionList(String tableName) throws IOException{
        String lockPath = prepareLockNode(tableName);
        WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
                Ids.OPEN_ACL_UNSAFE);
        RMLockListener myLockListener = new RMLockListener();
        wLock.setLockListener(myLockListener);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
              //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException(
                        "Unable to obtain lock while refreshing transactions of table "
                                + tableName + ".");
            }else {
                List<String> cfPaths = zkUtil
                        .getColumnFamiliesOfTable(tableName);
                for (String cf : cfPaths) {
                    String runningDataPath = PathUtil.getRunningTxnInfoPath(
                            baseDir, tableName, cf);
                    zkUtil.refreshTransactions(runningDataPath);
        }


            }
        } catch (KeeperException e) {
            throw new IOException("Exception while obtaining lock.", e);
        } catch (InterruptedException e) {
            throw new IOException("Exception while obtaining lock.", e);
        } finally {
            wLock.unlock();
        }


     }

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     *
     * @return revision ID
     * @throws IOException
     */
    public long obtainID() throws IOException{
        WriteLock wLock = new WriteLock(zookeeper, zNodeLockBasePath, Ids.OPEN_ACL_UNSAFE);
        wLock.setLockListener(this);
        try {
            boolean lockGrabbed = wLock.lock();
            if (lockGrabbed == false) {
                //TO DO : Let this request queue up and try obtaining lock.
                throw new IOException("Unable to obtain lock to obtain id.");
            } else {
                    id = incrementAndReadCounter();
            }
        } catch (KeeperException e) {
            LOG.warn("Exception while obtaining lock for ID.", e);
            throw new IOException("Exception while obtaining lock for ID.", e);
        } catch (InterruptedException e) {
            LOG.warn("Exception while obtaining lock for ID.", e);
            throw new IOException("Exception while obtaining lock for ID.", e);
        } finally {
            wLock.unlock();
        }
        return id;
    }

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      transaction.setKeepAlive(writeTxnTimeout);
    }


    refreshTransactionList(transaction.getTableName());
    String lockPath = prepareLockNode(table);
    WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
      Ids.OPEN_ACL_UNSAFE);
    RMLockListener myLockListener = new RMLockListener();
    wLock.setLockListener(myLockListener);
    try {
      boolean lockGrabbed = wLock.lock();
      if (lockGrabbed == false) {
        //TO DO : Let this request queue up and try obtaining lock.
        throw new IOException(
          "Unable to obtain lock while beginning transaction. "
            + transaction.toString());
      } else {
        List<String> colFamilies = transaction.getColumnFamilies();
        FamilyRevision revisionData = transaction.getFamilyRevisionInfo();
        for (String cfamily : colFamilies) {
          String path = PathUtil.getRunningTxnInfoPath(
            baseDir, table, cfamily);
          zkUtil.updateData(path, revisionData,
            ZKUtil.UpdateMode.APPEND);
        }
      }
    } catch (KeeperException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } catch (InterruptedException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } finally {
      wLock.unlock();
    }


    return transaction;
  }

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   */
  public void commitWriteTransaction(Transaction transaction) throws IOException {
    refreshTransactionList(transaction.getTableName());


    String lockPath = prepareLockNode(transaction.getTableName());
    WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
      Ids.OPEN_ACL_UNSAFE);
    RMLockListener myLockListener = new RMLockListener();
    wLock.setLockListener(myLockListener);
    try {
      boolean lockGrabbed = wLock.lock();
      if (lockGrabbed == false) {
        //TO DO : Let this request queue up and try obtaining lock.
        throw new IOException(
          "Unable to obtain lock while commiting transaction. "
            + transaction.toString());
      } else {
        String tableName = transaction.getTableName();
        List<String> colFamilies = transaction.getColumnFamilies();
        FamilyRevision revisionData = transaction.getFamilyRevisionInfo();
        for (String cfamily : colFamilies) {
          String path = PathUtil.getRunningTxnInfoPath(
            baseDir, tableName, cfamily);
          zkUtil.updateData(path, revisionData,
            ZKUtil.UpdateMode.REMOVE);
        }


      }
    } catch (KeeperException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } catch (InterruptedException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } finally {
      wLock.unlock();
    }
    LOG.info("Write Transaction committed: " + transaction.toString());
  }

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   */
  public void abortWriteTransaction(Transaction transaction) throws IOException {


    refreshTransactionList(transaction.getTableName());
    String lockPath = prepareLockNode(transaction.getTableName());
    WriteLock wLock = new WriteLock(zkUtil.getSession(), lockPath,
      Ids.OPEN_ACL_UNSAFE);
    RMLockListener myLockListener = new RMLockListener();
    wLock.setLockListener(myLockListener);
    try {
      boolean lockGrabbed = wLock.lock();
      if (lockGrabbed == false) {
        //TO DO : Let this request queue up and try obtaining lock.
        throw new IOException(
          "Unable to obtain lock while aborting transaction. "
            + transaction.toString());
      } else {
        String tableName = transaction.getTableName();
        List<String> colFamilies = transaction.getColumnFamilies();
        FamilyRevision revisionData = transaction
          .getFamilyRevisionInfo();
        for (String cfamily : colFamilies) {
          String path = PathUtil.getRunningTxnInfoPath(
            baseDir, tableName, cfamily);
          zkUtil.updateData(path, revisionData,
            ZKUtil.UpdateMode.REMOVE);
          path = PathUtil.getAbortInformationPath(baseDir,
            tableName, cfamily);
          zkUtil.updateData(path, revisionData,
            ZKUtil.UpdateMode.APPEND);
        }


      }
    } catch (KeeperException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } catch (InterruptedException e) {
      throw new IOException("Exception while obtaining lock.", e);
    } finally {
      wLock.unlock();
    }
    LOG.info("Write Transaction aborted: " + transaction.toString());
  }

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