Example usage for java.util.concurrent PriorityBlockingQueue size

Introduction

In this page you can find the example usage for java.util.concurrent PriorityBlockingQueue size.

Prototype

int size

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Document

The number of elements in the priority queue.

Usage

From source file:org.apache.hadoop.hbase.replication.regionserver.RecoveredReplicationSource.java

public void locateRecoveredPaths(PriorityBlockingQueue<Path> queue) throws IOException {
    boolean hasPathChanged = false;
    PriorityBlockingQueue<Path> newPaths = new PriorityBlockingQueue<Path>(queueSizePerGroup,
            new LogsComparator());
    pathsLoop: for (Path path : queue) {
        if (fs.exists(path)) { // still in same location, don't need to do anything
            newPaths.add(path);/* w  ww.  j a  v a 2  s . c  o m*/
            continue;
        }
        // Path changed - try to find the right path.
        hasPathChanged = true;
        if (stopper instanceof ReplicationSyncUp.DummyServer) {
            // In the case of disaster/recovery, HMaster may be shutdown/crashed before flush data
            // from .logs to .oldlogs. Loop into .logs folders and check whether a match exists
            Path newPath = getReplSyncUpPath(path);
            newPaths.add(newPath);
            continue;
        } else {
            // See if Path exists in the dead RS folder (there could be a chain of failures
            // to look at)
            List<String> deadRegionServers = this.replicationQueueInfo.getDeadRegionServers();
            LOG.info("NB dead servers : " + deadRegionServers.size());
            final Path walDir = FSUtils.getWALRootDir(conf);
            for (String curDeadServerName : deadRegionServers) {
                final Path deadRsDirectory = new Path(walDir,
                        AbstractFSWALProvider.getWALDirectoryName(curDeadServerName));
                Path[] locs = new Path[] { new Path(deadRsDirectory, path.getName()),
                        new Path(deadRsDirectory.suffix(AbstractFSWALProvider.SPLITTING_EXT), path.getName()) };
                for (Path possibleLogLocation : locs) {
                    LOG.info("Possible location " + possibleLogLocation.toUri().toString());
                    if (manager.getFs().exists(possibleLogLocation)) {
                        // We found the right new location
                        LOG.info("Log " + path + " still exists at " + possibleLogLocation);
                        newPaths.add(possibleLogLocation);
                        continue pathsLoop;
                    }
                }
            }
            // didn't find a new location
            LOG.error(String.format("WAL Path %s doesn't exist and couldn't find its new location", path));
            newPaths.add(path);
        }
    }

    if (hasPathChanged) {
        if (newPaths.size() != queue.size()) { // this shouldn't happen
            LOG.error("Recovery queue size is incorrect");
            throw new IOException("Recovery queue size error");
        }
        // put the correct locations in the queue
        // since this is a recovered queue with no new incoming logs,
        // there shouldn't be any concurrency issues
        queue.clear();
        for (Path path : newPaths) {
            queue.add(path);
        }
    }
}

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