/** Load all hlogs in all replication queues from ZK */
private Set<String> loadHLogsFromQueues() {
List<String> rss = zkHelper.getListOfReplicators();
if (rss == null) {
LOG.debug("Didn't find any region server that replicates, won't prevent any deletions.");
return ImmutableSet.of();
}
Set<String> hlogs = Sets.newHashSet();
for (String rs : rss) {
List<String> listOfPeers = zkHelper.getListPeersForRS(rs);
// if rs just died, this will be null
if (listOfPeers == null) {
continue;
}
for (String id : listOfPeers) {
List<String> peersHlogs = zkHelper.getListHLogsForPeerForRS(rs, id);
if (peersHlogs != null) {
hlogs.addAll(peersHlogs);
}
}
}
return hlogs;
}
@Override
public Iterable<FileStatus> getDeletableFiles(Iterable<FileStatus> files) {
try {
if (!zkHelper.getReplication()) {
return ImmutableList.of();
}
} catch (KeeperException e) {
abort("Cannot get the state of replication", e);
return ImmutableList.of();
}
// all members of this class are null if replication is disabled,
// so we cannot filter the files
if (this.getConf() == null) {
return files;
}
final Set<String> hlogs = loadHLogsFromQueues();
return Iterables.filter(
files,
new Predicate<FileStatus>() {
@Override
public boolean apply(FileStatus file) {
String hlog = file.getPath().getName();
boolean logInReplicationQueue = hlogs.contains(hlog);
if (LOG.isDebugEnabled()) {
if (logInReplicationQueue) {
LOG.debug("Found log in ZK, keeping: " + hlog);
} else {
LOG.debug("Didn't find this log in ZK, deleting: " + hlog);
}
}
return !logInReplicationQueue;
}
});
}