org.elasticsearch.rest.action.cat.RestNodesAction Maven / Gradle / Ivy
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.rest.action.cat;
import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoRequest;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.elasticsearch.action.admin.cluster.node.stats.NodeStats;
import org.elasticsearch.action.admin.cluster.node.stats.NodesStatsRequest;
import org.elasticsearch.action.admin.cluster.node.stats.NodesStatsResponse;
import org.elasticsearch.action.admin.cluster.state.ClusterStateRequest;
import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.Table;
import org.elasticsearch.common.network.NetworkAddress;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.http.HttpInfo;
import org.elasticsearch.index.cache.query.QueryCacheStats;
import org.elasticsearch.index.cache.request.RequestCacheStats;
import org.elasticsearch.index.engine.SegmentsStats;
import org.elasticsearch.index.fielddata.FieldDataStats;
import org.elasticsearch.index.flush.FlushStats;
import org.elasticsearch.index.get.GetStats;
import org.elasticsearch.index.merge.MergeStats;
import org.elasticsearch.index.refresh.RefreshStats;
import org.elasticsearch.index.search.stats.SearchStats;
import org.elasticsearch.index.shard.IndexingStats;
import org.elasticsearch.indices.NodeIndicesStats;
import org.elasticsearch.monitor.fs.FsInfo;
import org.elasticsearch.monitor.jvm.JvmInfo;
import org.elasticsearch.monitor.jvm.JvmStats;
import org.elasticsearch.monitor.os.OsStats;
import org.elasticsearch.monitor.process.ProcessStats;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestActionListener;
import org.elasticsearch.rest.action.RestResponseListener;
import org.elasticsearch.script.ScriptStats;
import org.elasticsearch.search.suggest.completion.CompletionStats;
import java.util.Locale;
import java.util.stream.Collectors;
import static org.elasticsearch.rest.RestRequest.Method.GET;
public class RestNodesAction extends AbstractCatAction {
public RestNodesAction(Settings settings, RestController controller) {
super(settings);
controller.registerHandler(GET, "/_cat/nodes", this);
}
@Override
public String getName() {
return "cat_nodes_action";
}
@Override
protected void documentation(StringBuilder sb) {
sb.append("/_cat/nodes\n");
}
@Override
public RestChannelConsumer doCatRequest(final RestRequest request, final NodeClient client) {
final ClusterStateRequest clusterStateRequest = new ClusterStateRequest();
clusterStateRequest.clear().nodes(true);
clusterStateRequest.local(request.paramAsBoolean("local", clusterStateRequest.local()));
clusterStateRequest.masterNodeTimeout(request.paramAsTime("master_timeout", clusterStateRequest.masterNodeTimeout()));
final boolean fullId = request.paramAsBoolean("full_id", false);
return channel -> client.admin().cluster().state(clusterStateRequest, new RestActionListener(channel) {
@Override
public void processResponse(final ClusterStateResponse clusterStateResponse) {
NodesInfoRequest nodesInfoRequest = new NodesInfoRequest();
nodesInfoRequest.clear().jvm(true).os(true).process(true).http(true);
client.admin().cluster().nodesInfo(nodesInfoRequest, new RestActionListener(channel) {
@Override
public void processResponse(final NodesInfoResponse nodesInfoResponse) {
NodesStatsRequest nodesStatsRequest = new NodesStatsRequest();
nodesStatsRequest.clear().jvm(true).os(true).fs(true).indices(true).process(true).script(true);
client.admin().cluster().nodesStats(nodesStatsRequest, new RestResponseListener(channel) {
@Override
public RestResponse buildResponse(NodesStatsResponse nodesStatsResponse) throws Exception {
return RestTable.buildResponse(buildTable(fullId, request, clusterStateResponse, nodesInfoResponse,
nodesStatsResponse), channel);
}
});
}
});
}
});
}
@Override
protected Table getTableWithHeader(final RestRequest request) {
Table table = new Table();
table.startHeaders();
table.addCell("id", "default:false;alias:id,nodeId;desc:unique node id");
table.addCell("pid", "default:false;alias:p;desc:process id");
table.addCell("ip", "alias:i;desc:ip address");
table.addCell("port", "default:false;alias:po;desc:bound transport port");
table.addCell("http_address", "default:false;alias:http;desc:bound http address");
table.addCell("version", "default:false;alias:v;desc:es version");
table.addCell("build", "default:false;alias:b;desc:es build hash");
table.addCell("jdk", "default:false;alias:j;desc:jdk version");
table.addCell("disk.total", "default:false;alias:dt,diskTotal;text-align:right;desc:total disk space");
table.addCell("disk.used", "default:false;alias:du,diskUsed;text-align:right;desc:used disk space");
table.addCell("disk.avail", "default:false;alias:d,da,disk,diskAvail;text-align:right;desc:available disk space");
table.addCell("disk.used_percent", "default:false;alias:dup,diskUsedPercent;text-align:right;desc:used disk space percentage");
table.addCell("heap.current", "default:false;alias:hc,heapCurrent;text-align:right;desc:used heap");
table.addCell("heap.percent", "alias:hp,heapPercent;text-align:right;desc:used heap ratio");
table.addCell("heap.max", "default:false;alias:hm,heapMax;text-align:right;desc:max configured heap");
table.addCell("ram.current", "default:false;alias:rc,ramCurrent;text-align:right;desc:used machine memory");
table.addCell("ram.percent", "alias:rp,ramPercent;text-align:right;desc:used machine memory ratio");
table.addCell("ram.max", "default:false;alias:rm,ramMax;text-align:right;desc:total machine memory");
table.addCell("file_desc.current", "default:false;alias:fdc,fileDescriptorCurrent;text-align:right;desc:used file descriptors");
table.addCell("file_desc.percent",
"default:false;alias:fdp,fileDescriptorPercent;text-align:right;desc:used file descriptor ratio");
table.addCell("file_desc.max", "default:false;alias:fdm,fileDescriptorMax;text-align:right;desc:max file descriptors");
table.addCell("cpu", "alias:cpu;text-align:right;desc:recent cpu usage");
table.addCell("load_1m", "alias:l;text-align:right;desc:1m load avg");
table.addCell("load_5m", "alias:l;text-align:right;desc:5m load avg");
table.addCell("load_15m", "alias:l;text-align:right;desc:15m load avg");
table.addCell("uptime", "default:false;alias:u;text-align:right;desc:node uptime");
table.addCell("node.role",
"alias:r,role,nodeRole;desc:m:master eligible node, d:data node, i:ingest node, -:coordinating node only");
table.addCell("master", "alias:m;desc:*:current master");
table.addCell("name", "alias:n;desc:node name");
table.addCell("completion.size", "alias:cs,completionSize;default:false;text-align:right;desc:size of completion");
table.addCell("fielddata.memory_size", "alias:fm,fielddataMemory;default:false;text-align:right;desc:used fielddata cache");
table.addCell("fielddata.evictions", "alias:fe,fielddataEvictions;default:false;text-align:right;desc:fielddata evictions");
table.addCell("query_cache.memory_size", "alias:qcm,queryCacheMemory;default:false;text-align:right;desc:used query cache");
table.addCell("query_cache.evictions", "alias:qce,queryCacheEvictions;default:false;text-align:right;desc:query cache evictions");
table.addCell("request_cache.memory_size", "alias:rcm,requestCacheMemory;default:false;text-align:right;desc:used request cache");
table.addCell("request_cache.evictions",
"alias:rce,requestCacheEvictions;default:false;text-align:right;desc:request cache evictions");
table.addCell("request_cache.hit_count",
"alias:rchc,requestCacheHitCount;default:false;text-align:right;desc:request cache hit counts");
table.addCell("request_cache.miss_count",
"alias:rcmc,requestCacheMissCount;default:false;text-align:right;desc:request cache miss counts");
table.addCell("flush.total", "alias:ft,flushTotal;default:false;text-align:right;desc:number of flushes");
table.addCell("flush.total_time", "alias:ftt,flushTotalTime;default:false;text-align:right;desc:time spent in flush");
table.addCell("get.current", "alias:gc,getCurrent;default:false;text-align:right;desc:number of current get ops");
table.addCell("get.time", "alias:gti,getTime;default:false;text-align:right;desc:time spent in get");
table.addCell("get.total", "alias:gto,getTotal;default:false;text-align:right;desc:number of get ops");
table.addCell("get.exists_time", "alias:geti,getExistsTime;default:false;text-align:right;desc:time spent in successful gets");
table.addCell("get.exists_total", "alias:geto,getExistsTotal;default:false;text-align:right;desc:number of successful gets");
table.addCell("get.missing_time", "alias:gmti,getMissingTime;default:false;text-align:right;desc:time spent in failed gets");
table.addCell("get.missing_total", "alias:gmto,getMissingTotal;default:false;text-align:right;desc:number of failed gets");
table.addCell("indexing.delete_current",
"alias:idc,indexingDeleteCurrent;default:false;text-align:right;desc:number of current deletions");
table.addCell("indexing.delete_time", "alias:idti,indexingDeleteTime;default:false;text-align:right;desc:time spent in deletions");
table.addCell("indexing.delete_total", "alias:idto,indexingDeleteTotal;default:false;text-align:right;desc:number of delete ops");
table.addCell("indexing.index_current",
"alias:iic,indexingIndexCurrent;default:false;text-align:right;desc:number of current indexing ops");
table.addCell("indexing.index_time", "alias:iiti,indexingIndexTime;default:false;text-align:right;desc:time spent in indexing");
table.addCell("indexing.index_total", "alias:iito,indexingIndexTotal;default:false;text-align:right;desc:number of indexing ops");
table.addCell("indexing.index_failed",
"alias:iif,indexingIndexFailed;default:false;text-align:right;desc:number of failed indexing ops");
table.addCell("merges.current", "alias:mc,mergesCurrent;default:false;text-align:right;desc:number of current merges");
table.addCell("merges.current_docs",
"alias:mcd,mergesCurrentDocs;default:false;text-align:right;desc:number of current merging docs");
table.addCell("merges.current_size", "alias:mcs,mergesCurrentSize;default:false;text-align:right;desc:size of current merges");
table.addCell("merges.total", "alias:mt,mergesTotal;default:false;text-align:right;desc:number of completed merge ops");
table.addCell("merges.total_docs", "alias:mtd,mergesTotalDocs;default:false;text-align:right;desc:docs merged");
table.addCell("merges.total_size", "alias:mts,mergesTotalSize;default:false;text-align:right;desc:size merged");
table.addCell("merges.total_time", "alias:mtt,mergesTotalTime;default:false;text-align:right;desc:time spent in merges");
table.addCell("refresh.total", "alias:rto,refreshTotal;default:false;text-align:right;desc:total refreshes");
table.addCell("refresh.time", "alias:rti,refreshTime;default:false;text-align:right;desc:time spent in refreshes");
table.addCell("refresh.listeners", "alias:rli,refreshListeners;default:false;text-align:right;"
+ "desc:number of pending refresh listeners");
table.addCell("script.compilations", "alias:scrcc,scriptCompilations;default:false;text-align:right;desc:script compilations");
table.addCell("script.cache_evictions",
"alias:scrce,scriptCacheEvictions;default:false;text-align:right;desc:script cache evictions");
table.addCell("search.fetch_current", "alias:sfc,searchFetchCurrent;default:false;text-align:right;desc:current fetch phase ops");
table.addCell("search.fetch_time", "alias:sfti,searchFetchTime;default:false;text-align:right;desc:time spent in fetch phase");
table.addCell("search.fetch_total", "alias:sfto,searchFetchTotal;default:false;text-align:right;desc:total fetch ops");
table.addCell("search.open_contexts", "alias:so,searchOpenContexts;default:false;text-align:right;desc:open search contexts");
table.addCell("search.query_current", "alias:sqc,searchQueryCurrent;default:false;text-align:right;desc:current query phase ops");
table.addCell("search.query_time", "alias:sqti,searchQueryTime;default:false;text-align:right;desc:time spent in query phase");
table.addCell("search.query_total", "alias:sqto,searchQueryTotal;default:false;text-align:right;desc:total query phase ops");
table.addCell("search.scroll_current", "alias:scc,searchScrollCurrent;default:false;text-align:right;desc:open scroll contexts");
table.addCell("search.scroll_time",
"alias:scti,searchScrollTime;default:false;text-align:right;desc:time scroll contexts held open");
table.addCell("search.scroll_total", "alias:scto,searchScrollTotal;default:false;text-align:right;desc:completed scroll contexts");
table.addCell("segments.count", "alias:sc,segmentsCount;default:false;text-align:right;desc:number of segments");
table.addCell("segments.memory", "alias:sm,segmentsMemory;default:false;text-align:right;desc:memory used by segments");
table.addCell("segments.index_writer_memory",
"alias:siwm,segmentsIndexWriterMemory;default:false;text-align:right;desc:memory used by index writer");
table.addCell("segments.version_map_memory",
"alias:svmm,segmentsVersionMapMemory;default:false;text-align:right;desc:memory used by version map");
table.addCell("segments.fixed_bitset_memory",
"alias:sfbm,fixedBitsetMemory;default:false;text-align:right;desc:memory used by fixed bit sets for nested object field types" +
" and type filters for types referred in _parent fields");
table.addCell("suggest.current", "alias:suc,suggestCurrent;default:false;text-align:right;desc:number of current suggest ops");
table.addCell("suggest.time", "alias:suti,suggestTime;default:false;text-align:right;desc:time spend in suggest");
table.addCell("suggest.total", "alias:suto,suggestTotal;default:false;text-align:right;desc:number of suggest ops");
table.endHeaders();
return table;
}
private Table buildTable(boolean fullId, RestRequest req, ClusterStateResponse state, NodesInfoResponse nodesInfo,
NodesStatsResponse nodesStats) {
DiscoveryNodes nodes = state.getState().nodes();
String masterId = nodes.getMasterNodeId();
Table table = getTableWithHeader(req);
for (DiscoveryNode node : nodes) {
NodeInfo info = nodesInfo.getNodesMap().get(node.getId());
NodeStats stats = nodesStats.getNodesMap().get(node.getId());
JvmInfo jvmInfo = info == null ? null : info.getJvm();
JvmStats jvmStats = stats == null ? null : stats.getJvm();
FsInfo fsInfo = stats == null ? null : stats.getFs();
OsStats osStats = stats == null ? null : stats.getOs();
ProcessStats processStats = stats == null ? null : stats.getProcess();
NodeIndicesStats indicesStats = stats == null ? null : stats.getIndices();
table.startRow();
table.addCell(fullId ? node.getId() : Strings.substring(node.getId(), 0, 4));
table.addCell(info == null ? null : info.getProcess().getId());
table.addCell(node.getHostAddress());
table.addCell(node.getAddress().address().getPort());
final HttpInfo httpInfo = info == null ? null : info.getHttp();
if (httpInfo != null) {
TransportAddress transportAddress = httpInfo.getAddress().publishAddress();
table.addCell(NetworkAddress.format(transportAddress.address()));
} else {
table.addCell("-");
}
table.addCell(node.getVersion().toString());
table.addCell(info == null ? null : info.getBuild().shortHash());
table.addCell(jvmInfo == null ? null : jvmInfo.version());
if (fsInfo != null) {
long diskTotal = fsInfo.getTotal().getTotal().getBytes();
long diskUsed = diskTotal - fsInfo.getTotal().getAvailable().getBytes();
double diskUsedRatio = diskTotal == 0 ? 1.0 : (double) diskUsed / diskTotal;
table.addCell(fsInfo.getTotal().getTotal());
table.addCell(new ByteSizeValue(diskUsed));
table.addCell(fsInfo.getTotal().getAvailable());
table.addCell(String.format(Locale.ROOT, "%.2f", 100.0 * diskUsedRatio));
} else {
table.addCell(null);
table.addCell(null);
table.addCell(null);
table.addCell(null);
}
table.addCell(jvmStats == null ? null : jvmStats.getMem().getHeapUsed());
table.addCell(jvmStats == null ? null : jvmStats.getMem().getHeapUsedPercent());
table.addCell(jvmInfo == null ? null : jvmInfo.getMem().getHeapMax());
table.addCell(osStats == null ? null : osStats.getMem() == null ? null : osStats.getMem().getUsed());
table.addCell(osStats == null ? null : osStats.getMem() == null ? null : osStats.getMem().getUsedPercent());
table.addCell(osStats == null ? null : osStats.getMem() == null ? null : osStats.getMem().getTotal());
table.addCell(processStats == null ? null : processStats.getOpenFileDescriptors());
table.addCell(processStats == null ? null : calculatePercentage(processStats.getOpenFileDescriptors(),
processStats.getMaxFileDescriptors()));
table.addCell(processStats == null ? null : processStats.getMaxFileDescriptors());
table.addCell(osStats == null ? null : Short.toString(osStats.getCpu().getPercent()));
boolean hasLoadAverage = osStats != null && osStats.getCpu().getLoadAverage() != null;
table.addCell(!hasLoadAverage || osStats.getCpu().getLoadAverage()[0] == -1 ? null :
String.format(Locale.ROOT, "%.2f", osStats.getCpu().getLoadAverage()[0]));
table.addCell(!hasLoadAverage || osStats.getCpu().getLoadAverage()[1] == -1 ? null :
String.format(Locale.ROOT, "%.2f", osStats.getCpu().getLoadAverage()[1]));
table.addCell(!hasLoadAverage || osStats.getCpu().getLoadAverage()[2] == -1 ? null :
String.format(Locale.ROOT, "%.2f", osStats.getCpu().getLoadAverage()[2]));
table.addCell(jvmStats == null ? null : jvmStats.getUptime());
final String roles;
if (node.getRoles().isEmpty()) {
roles = "-";
} else {
roles = node.getRoles().stream().map(DiscoveryNode.Role::getAbbreviation).collect(Collectors.joining());
}
table.addCell(roles);
table.addCell(masterId == null ? "x" : masterId.equals(node.getId()) ? "*" : "-");
table.addCell(node.getName());
CompletionStats completionStats = indicesStats == null ? null : stats.getIndices().getCompletion();
table.addCell(completionStats == null ? null : completionStats.getSize());
FieldDataStats fdStats = indicesStats == null ? null : stats.getIndices().getFieldData();
table.addCell(fdStats == null ? null : fdStats.getMemorySize());
table.addCell(fdStats == null ? null : fdStats.getEvictions());
QueryCacheStats fcStats = indicesStats == null ? null : indicesStats.getQueryCache();
table.addCell(fcStats == null ? null : fcStats.getMemorySize());
table.addCell(fcStats == null ? null : fcStats.getEvictions());
RequestCacheStats qcStats = indicesStats == null ? null : indicesStats.getRequestCache();
table.addCell(qcStats == null ? null : qcStats.getMemorySize());
table.addCell(qcStats == null ? null : qcStats.getEvictions());
table.addCell(qcStats == null ? null : qcStats.getHitCount());
table.addCell(qcStats == null ? null : qcStats.getMissCount());
FlushStats flushStats = indicesStats == null ? null : indicesStats.getFlush();
table.addCell(flushStats == null ? null : flushStats.getTotal());
table.addCell(flushStats == null ? null : flushStats.getTotalTime());
GetStats getStats = indicesStats == null ? null : indicesStats.getGet();
table.addCell(getStats == null ? null : getStats.current());
table.addCell(getStats == null ? null : getStats.getTime());
table.addCell(getStats == null ? null : getStats.getCount());
table.addCell(getStats == null ? null : getStats.getExistsTime());
table.addCell(getStats == null ? null : getStats.getExistsCount());
table.addCell(getStats == null ? null : getStats.getMissingTime());
table.addCell(getStats == null ? null : getStats.getMissingCount());
IndexingStats indexingStats = indicesStats == null ? null : indicesStats.getIndexing();
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getDeleteCurrent());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getDeleteTime());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getDeleteCount());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getIndexCurrent());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getIndexTime());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getIndexCount());
table.addCell(indexingStats == null ? null : indexingStats.getTotal().getIndexFailedCount());
MergeStats mergeStats = indicesStats == null ? null : indicesStats.getMerge();
table.addCell(mergeStats == null ? null : mergeStats.getCurrent());
table.addCell(mergeStats == null ? null : mergeStats.getCurrentNumDocs());
table.addCell(mergeStats == null ? null : mergeStats.getCurrentSize());
table.addCell(mergeStats == null ? null : mergeStats.getTotal());
table.addCell(mergeStats == null ? null : mergeStats.getTotalNumDocs());
table.addCell(mergeStats == null ? null : mergeStats.getTotalSize());
table.addCell(mergeStats == null ? null : mergeStats.getTotalTime());
RefreshStats refreshStats = indicesStats == null ? null : indicesStats.getRefresh();
table.addCell(refreshStats == null ? null : refreshStats.getTotal());
table.addCell(refreshStats == null ? null : refreshStats.getTotalTime());
table.addCell(refreshStats == null ? null : refreshStats.getListeners());
ScriptStats scriptStats = stats == null ? null : stats.getScriptStats();
table.addCell(scriptStats == null ? null : scriptStats.getCompilations());
table.addCell(scriptStats == null ? null : scriptStats.getCacheEvictions());
SearchStats searchStats = indicesStats == null ? null : indicesStats.getSearch();
table.addCell(searchStats == null ? null : searchStats.getTotal().getFetchCurrent());
table.addCell(searchStats == null ? null : searchStats.getTotal().getFetchTime());
table.addCell(searchStats == null ? null : searchStats.getTotal().getFetchCount());
table.addCell(searchStats == null ? null : searchStats.getOpenContexts());
table.addCell(searchStats == null ? null : searchStats.getTotal().getQueryCurrent());
table.addCell(searchStats == null ? null : searchStats.getTotal().getQueryTime());
table.addCell(searchStats == null ? null : searchStats.getTotal().getQueryCount());
table.addCell(searchStats == null ? null : searchStats.getTotal().getScrollCurrent());
table.addCell(searchStats == null ? null : searchStats.getTotal().getScrollTime());
table.addCell(searchStats == null ? null : searchStats.getTotal().getScrollCount());
SegmentsStats segmentsStats = indicesStats == null ? null : indicesStats.getSegments();
table.addCell(segmentsStats == null ? null : segmentsStats.getCount());
table.addCell(segmentsStats == null ? null : segmentsStats.getMemory());
table.addCell(segmentsStats == null ? null : segmentsStats.getIndexWriterMemory());
table.addCell(segmentsStats == null ? null : segmentsStats.getVersionMapMemory());
table.addCell(segmentsStats == null ? null : segmentsStats.getBitsetMemory());
table.addCell(searchStats == null ? null : searchStats.getTotal().getSuggestCurrent());
table.addCell(searchStats == null ? null : searchStats.getTotal().getSuggestTime());
table.addCell(searchStats == null ? null : searchStats.getTotal().getSuggestCount());
table.endRow();
}
return table;
}
/**
* Calculate the percentage of {@code used} from the {@code max} number.
* @param used The currently used number.
* @param max The maximum number.
* @return 0 if {@code max} is <= 0. Otherwise 100 * {@code used} / {@code max}.
*/
private short calculatePercentage(long used, long max) {
return max <= 0 ? 0 : (short)((100d * used) / max);
}
}
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