Example usage for java.util.concurrent ConcurrentMap remove

Introduction

In this page you can find the example usage for java.util.concurrent ConcurrentMap remove.

Prototype

boolean remove(Object key, Object value);

Source Link

Document

Removes the entry for a key only if currently mapped to a given value.

Usage

From source file:org.apache.hadoop.hbase.client.MetaCache.java

/**
 * Delete all cached entries of a server.
 *//*  w  ww  .j  a va  2 s.  c  om*/
public void clearCache(final ServerName serverName) {
    if (!this.cachedServers.contains(serverName)) {
        return;
    }

    boolean deletedSomething = false;
    synchronized (this.cachedServers) {
        // We block here, because if there is an error on a server, it's likely that multiple
        //  threads will get the error  simultaneously. If there are hundreds of thousand of
        //  region location to check, it's better to do this only once. A better pattern would
        //  be to check if the server is dead when we get the region location.
        if (!this.cachedServers.contains(serverName)) {
            return;
        }
        for (ConcurrentMap<byte[], RegionLocations> tableLocations : cachedRegionLocations.values()) {
            for (Entry<byte[], RegionLocations> e : tableLocations.entrySet()) {
                RegionLocations regionLocations = e.getValue();
                if (regionLocations != null) {
                    RegionLocations updatedLocations = regionLocations.removeByServer(serverName);
                    if (updatedLocations != regionLocations) {
                        if (updatedLocations.isEmpty()) {
                            deletedSomething |= tableLocations.remove(e.getKey(), regionLocations);
                        } else {
                            deletedSomething |= tableLocations.replace(e.getKey(), regionLocations,
                                    updatedLocations);
                        }
                    }
                }
            }
        }
        this.cachedServers.remove(serverName);
    }
    if (deletedSomething && LOG.isTraceEnabled()) {
        LOG.trace("Removed all cached region locations that map to " + serverName);
    }
}

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From source file:org.apache.hadoop.hbase.client.MetaCache.java

/**
 * Deletes the cached location of the region if necessary, based on some error from source.
 * @param hri The region in question.// ww  w.  ja  va 2s  .  c  o m
 */
public void clearCache(HRegionInfo hri) {
    ConcurrentMap<byte[], RegionLocations> tableLocations = getTableLocations(hri.getTable());
    RegionLocations regionLocations = tableLocations.get(hri.getStartKey());
    if (regionLocations != null) {
        HRegionLocation oldLocation = regionLocations.getRegionLocation(hri.getReplicaId());
        if (oldLocation == null)
            return;
        RegionLocations updatedLocations = regionLocations.remove(oldLocation);
        boolean removed = false;
        if (updatedLocations != regionLocations) {
            if (updatedLocations.isEmpty()) {
                removed = tableLocations.remove(hri.getStartKey(), regionLocations);
            } else {
                removed = tableLocations.replace(hri.getStartKey(), regionLocations, updatedLocations);
            }
            if (removed && LOG.isTraceEnabled()) {
                LOG.trace("Removed " + oldLocation + " from cache");
            }
        }
    }
}

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From source file:org.apache.hadoop.hbase.client.MetaCache.java

/**
 * Delete a cached location, no matter what it is. Called when we were told to not use cache.
 * @param tableName tableName// w ww.  j  a  va  2  s  .  com
 * @param row
 */
public void clearCache(final TableName tableName, final byte[] row, int replicaId) {
    ConcurrentMap<byte[], RegionLocations> tableLocations = getTableLocations(tableName);

    boolean removed = false;
    RegionLocations regionLocations = getCachedLocation(tableName, row);
    if (regionLocations != null) {
        HRegionLocation toBeRemoved = regionLocations.getRegionLocation(replicaId);
        RegionLocations updatedLocations = regionLocations.remove(replicaId);
        if (updatedLocations != regionLocations) {
            byte[] startKey = regionLocations.getRegionLocation().getRegionInfo().getStartKey();
            if (updatedLocations.isEmpty()) {
                removed = tableLocations.remove(startKey, regionLocations);
            } else {
                removed = tableLocations.replace(startKey, regionLocations, updatedLocations);
            }
        }

        if (removed && LOG.isTraceEnabled() && toBeRemoved != null) {
            LOG.trace("Removed " + toBeRemoved + " from cache");
        }
    }
}

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