/** Runs the merge protocol as a leader */
public void run() {
// 1. Generate merge_id
MergeId new_merge_id = MergeId.create(gms.local_addr);
Collection<Address> coordsCopy = null;
try {
boolean success = setMergeId(null, new_merge_id);
if (!success) {
log.warn("failed to set my own merge_id (" + merge_id + ") to " + new_merge_id);
return;
}
coordsCopy = new ArrayList<Address>(coords.keySet());
/* 2. Fetch the current Views/Digests from all subgroup coordinators */
success = getMergeDataFromSubgroupCoordinators(coords, new_merge_id, gms.merge_timeout);
if (!success)
throw new Exception(
"merge leader did not get data from all partition coordinators " + coords.keySet());
/* 3. Remove rejected MergeData elements from merge_rsp and coords (so we'll send the new view
* only to members who accepted the merge request) */
removeRejectedMergeRequests(coords.keySet());
if (merge_rsps.size() == 0)
throw new Exception("did not get any merge responses from partition coordinators");
if (!coords
.keySet()
.contains(
gms.local_addr)) // another member might have invoked a merge req on us before we
// got there...
throw new Exception("merge leader rejected merge request");
/* 4. Combine all views and digests into 1 View/1 Digest */
Vector<MergeData> merge_data = new Vector<MergeData>(merge_rsps.getResults().values());
MergeData combined_merge_data = consolidateMergeData(merge_data);
if (combined_merge_data == null) throw new Exception("could not consolidate merge");
/* 4. Send the new View/Digest to all coordinators (including myself). On reception, they will
install the digest and view in all of their subgroup members */
sendMergeView(coords.keySet(), combined_merge_data, new_merge_id);
} catch (Throwable ex) {
if (log.isWarnEnabled())
log.warn(gms.local_addr + ": " + ex.getLocalizedMessage() + ", merge is cancelled");
sendMergeCancelledMessage(coordsCopy, new_merge_id);
} finally {
gms.getViewHandler().resume(new_merge_id);
stopMergeCanceller(); // this is probably not necessary
/*5. if flush is in stack stop the flush for entire cluster [JGRP-700] - FLUSH: flushing should span merge */
gms.stopFlush();
if (log.isDebugEnabled()) log.debug(gms.local_addr + ": merge leader completed merge task");
thread = null;
}
}
public int size() {
int retval = Global.BYTE_SIZE * 2; // type + merge_rejected
retval += Global.BYTE_SIZE; // presence view
retval += Global.BYTE_SIZE; // MergeView or View
if (view != null) retval += view.serializedSize();
retval += Util.size(mbr);
retval += Util.size(mbrs);
retval += Global.BYTE_SIZE; // presence of join_rsp
if (join_rsp != null) retval += join_rsp.serializedSize();
retval += Global.BYTE_SIZE; // presence for my_digest
if (my_digest != null) retval += my_digest.serializedSize();
retval += Global.BYTE_SIZE; // presence for merge_id
if (merge_id != null) retval += merge_id.size();
retval += Global.BYTE_SIZE; // boolean useFlushIfPresent
return retval;
}
public void run() {
// 1. Generate merge_id
final MergeId new_merge_id = MergeId.create(gms.local_addr);
final Collection<Address> coordsCopy = new ArrayList<Address>(coords.keySet());
long start = System.currentTimeMillis();
try {
_run(new_merge_id, coordsCopy); // might remove members from coordsCopy
} catch (Throwable ex) {
if (log.isWarnEnabled()) log.warn(gms.local_addr + ": " + ex + ", merge is cancelled");
sendMergeCancelledMessage(coordsCopy, new_merge_id);
cancelMerge(
new_merge_id); // the message above cancels the merge, too, but this is a 2nd line of
// defense
} finally {
/* 5. if flush is in stack stop the flush for entire cluster [JGRP-700] - FLUSH: flushing should span merge */
if (gms.flushProtocolInStack) gms.stopFlush();
thread = null;
}
long diff = System.currentTimeMillis() - start;
if (log.isDebugEnabled())
log.debug(gms.local_addr + ": merge " + new_merge_id + " took " + diff + " ms");
}
public String getMergeIdAsString() {
return merge_id != null ? merge_id.toString() : null;
}